Package org.hibernate.dialect

Class DialectDelegateWrapper

java.lang.Object

org.hibernate.dialect.Dialect

org.hibernate.dialect.DialectDelegateWrapper

All Implemented Interfaces:

FunctionContributor, TypeContributor, ConversionContext

@Incubating
public class DialectDelegateWrapper
extends Dialect

A wrapper of Dialect, to allow decorating some selected methods without having to extend the original class. This is used by Hibernate Reactive, possibly useful for others too, best maintained in the Hibernate ORM core repository to ensure alignment with the Dialect contract.

Nested Class Summary

Nested classes/interfaces inherited from class org.hibernate.dialect.Dialect

Dialect.SizeStrategy, Dialect.SizeStrategyImpl

Field Summary

Fields

Modifier and Type	Field	Description
protected final Dialect	wrapped

Fields inherited from class org.hibernate.dialect.Dialect

CLOSED_QUOTE, LEGACY_LOB_MERGE_STRATEGY, LOG_BASE2OF10, NEW_LOCATOR_LOB_MERGE_STRATEGY, QUOTE, STANDARD_MULTI_KEY_LOAD_SIZING_STRATEGY, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors

Constructor	Description
DialectDelegateWrapper(Dialect wrapped)

Method Summary

Modifier and Type	Method	Description
String	addSqlHintOrComment(String sql, QueryOptions queryOptions, boolean commentsEnabled)	Modify the SQL, adding hints or comments, if necessary
void	appendArrayLiteral(SqlAppender appender, Object[] literal, JdbcLiteralFormatter<Object> elementFormatter, WrapperOptions wrapperOptions)	Append an array literal with the given elements to the given SqlAppender.
void	appendBinaryLiteral(SqlAppender appender, byte[] bytes)	Append a binary literal to the given SqlAppender.
void	appendBooleanValueString(SqlAppender appender, boolean bool)	Append the SQL literal expression representing the given boolean value to the given SqlAppender.
void	appendDatetimeFormat(SqlAppender appender, String format)	Translate the given datetime format string from the pattern language defined by Java's DateTimeFormatter to whatever pattern language is understood by the native datetime formatting function for this database (often the to_char() function).
void	appendDateTimeLiteral(SqlAppender appender, TemporalAccessor temporalAccessor, TemporalType precision, TimeZone jdbcTimeZone)	Append a datetime literal representing the given java.time value to the given SqlAppender.
void	appendDateTimeLiteral(SqlAppender appender, Calendar calendar, TemporalType precision, TimeZone jdbcTimeZone)	Append a datetime literal representing the given Calendar value to the given SqlAppender.
void	appendDateTimeLiteral(SqlAppender appender, Date date, TemporalType precision, TimeZone jdbcTimeZone)	Append a datetime literal representing the given Date value to the given SqlAppender.
void	appendIntervalLiteral(SqlAppender appender, Duration literal)	Append a literal SQL interval representing the given Java Duration.
void	appendLiteral(SqlAppender appender, String literal)	Append a literal string to the given SqlAppender.
String	appendLockHint(LockOptions lockOptions, String tableName)	Some dialects support an alternative means to SELECT FOR UPDATE, whereby a "lock hint" is appended to the table name in the from clause.
void	appendUUIDLiteral(SqlAppender appender, UUID literal)	Append a literal SQL uuid representing the given Java UUID.
String	applyLocksToSql(String sql, LockOptions aliasedLockOptions, Map<String,String[]> keyColumnNames)	Modifies the given SQL, applying the appropriate updates for the specified lock modes and key columns.
void	augmentPhysicalTableTypes(List<String> tableTypesList)
void	augmentRecognizedTableTypes(List<String> tableTypesList)
IdentifierHelper	buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)	The IdentifierHelper indicated by this dialect for handling identifier conversions.
SQLExceptionConversionDelegate	buildSQLExceptionConversionDelegate()	An instance of SQLExceptionConversionDelegate for interpreting dialect-specific error or SQLState codes.
boolean	canBatchTruncate()	Does the truncate table statement accept multiple tables?
boolean	canCreateCatalog()	Does this dialect support creating and dropping catalogs?
boolean	canCreateSchema()	Does this dialect support creating and dropping schema?
boolean	canDisableConstraints()	Is there some way to disable foreign key constraint checking while truncating tables? (If there's no way to do it, and if we can't batch truncate, we must drop and recreate the constraints instead.)
String	castPattern(CastType from, CastType to)	Obtain a pattern for the SQL equivalent to a cast() function call.
String	castType(int sqlTypeCode)	The SQL type to use in cast( ... as ... ) expressions when casting to the target type represented by the given JDBC type code.
protected final void	checkVersion()
char	closeQuote()	The character specific to this dialect used to close a quoted identifier.
String	columnType(int sqlTypeCode)	The database column type name for a given JDBC type code defined in Types or SqlTypes.
void	contribute(TypeContributions typeContributions, ServiceRegistry serviceRegistry)	Contribute types
void	contributeFunctions(FunctionContributions functionContributions)	Contribute functions
void	contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)	A callback which allows the Dialect to contribute types.
MutationOperation	createOptionalTableUpdateOperation(EntityMutationTarget mutationTarget, OptionalTableUpdate optionalTableUpdate, SessionFactoryImplementor factory)	Create a MutationOperation for a updating an optional table
String	currentDate()	Translation of the HQL/JPQL current_date function, which maps to the Java type Date, and of the HQL local_date function which maps to the Java type LocalDate.
String	currentLocalTime()	Translation of the HQL local_time function, which maps to the Java type LocalTime which is a time with no time zone.
String	currentLocalTimestamp()	Translation of the HQL local_datetime function, which maps to the Java type LocalDateTime which is a datetime with no time zone.
String	currentTime()	Translation of the HQL/JPQL current_time function, which maps to the Java type Time which is a time with no time zone.
String	currentTimestamp()	Translation of the HQL/JPQL current_timestamp function, which maps to the Java type Timestamp which is a datetime with no time zone.
String	currentTimestampWithTimeZone()	Translation of the HQL offset_datetime function, which maps to the Java type OffsetDateTime which is a datetime with a time zone.
ScrollMode	defaultScrollMode()	A default ScrollMode to be used by Query.scroll().
boolean	doesReadCommittedCauseWritersToBlockReaders()	For the underlying database, is READ_COMMITTED isolation implemented by forcing readers to wait for write locks to be released?
boolean	doesRepeatableReadCauseReadersToBlockWriters()	For the underlying database, is REPEATABLE_READ isolation implemented by forcing writers to wait for read locks to be released?
boolean	dropConstraints()	Do we need to drop constraints before dropping tables in this dialect?
boolean	equivalentTypes(int typeCode1, int typeCode2)	Do the given JDBC type codes, as defined in Types represent essentially the same type in this dialect of SQL?
static String	escapeComment(String comment)
String	extractPattern(TemporalUnit unit)	Obtain a pattern for the SQL equivalent to an extract() function call.
static Dialect	extractRealDialect(Dialect dialect)	Extract the wrapped dialect, recursively until a non-wrapped implementation is found; this is useful for all the code needing to know "of which type" the underlying implementation actually is.
boolean	forceLobAsLastValue()	Must LOB values occur last in inserts and updates?
String	generatedAs(String generatedAs)	The generated as clause, or similar, for generated column declarations in DDL statements.
String	getAddColumnString()	The subcommand of the alter table command used to add a column to a table, usually add column or add.
String	getAddColumnSuffixString()	The syntax for the suffix used to add a column to a table.
String	getAddForeignKeyConstraintString(String constraintName, String foreignKeyDefinition)	The syntax used to add a foreign key constraint to a table, given the definition of the foreign key as a string.
String	getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable, String[] primaryKey, boolean referencesPrimaryKey)	The syntax used to add a foreign key constraint to a table, with the referenced key columns explicitly specified.
String	getAddPrimaryKeyConstraintString(String constraintName)	The syntax used to add a primary key constraint to a table.
AggregateSupport	getAggregateSupport()	How does this dialect support aggregate types like SqlTypes.STRUCT.
String	getAlterColumnTypeString(String columnName, String columnType, String columnDefinition)	The fragment of an alter table command which modifies a column type, or null if column types cannot be modified.
String	getAlterTableString(String tableName)	The command used to alter a table with the given name, usually alter table tab_name or alter table tab_name if exists.
String	getArrayTypeName(String javaElementTypeName, String elementTypeName, Integer maxLength)	The SQL type name for the array type with elements of the given type name.
Exporter<AuxiliaryDatabaseObject>	getAuxiliaryDatabaseObjectExporter()	Get an Exporter for AuxiliaryDatabaseObjects, usually StandardAuxiliaryDatabaseObjectExporter.
MultiKeyLoadSizingStrategy	getBatchLoadSizingStrategy()	The strategy used to determine the appropriate number of keys to load in a single SQL query with batch-fetch loading.
CallableStatementSupport	getCallableStatementSupport()	The CallableStatementSupport for this database.
String	getCascadeConstraintsString()	The keyword that specifies that a drop table operation should be cascaded to its constraints, typically " cascade" where the leading space is required, or the empty string if there is no such keyword in this dialect.
String	getCaseInsensitiveLike()	The name of the SQL operator that performs case-insensitive LIKE comparisons.
String	getCheckCondition(String columnName, long min, long max)	Render a SQL check condition for a column that represents an enumerated value.
String	getCheckCondition(String columnName, String[] values)	Render a SQL check condition for a column that represents an enumerated value by its string representation or a given list of values (with NULL value allowed).
ColumnAliasExtractor	getColumnAliasExtractor()	A ColumnAliasExtractor, usually just ResultSetMetaData.getColumnLabel(int).
String	getColumnComment(String comment)	Get the comment into a form supported for column definition.
String[]	getCreateCatalogCommand(String catalogName)	Get the SQL command used to create the named catalog.
String	getCreateIndexString(boolean unique)	The command used to create an index, usually create index or create unique index.
String	getCreateIndexTail(boolean unique, List<Column> columns)	A string to be appended to the end of the create index command, usually to specify that null values are to be considered distinct.
String	getCreateMultisetTableString()	Slight variation on Dialect.getCreateTableString().
String[]	getCreateSchemaCommand(String schemaName)	Get the SQL command used to create the named schema.
String	getCreateTableString()	The command used to create a table, usually create table.
String	getCreateTemporaryTableColumnAnnotation(int sqlTypeCode)	Annotation to be appended to the end of each COLUMN clause for temporary tables.
String	getCreateUserDefinedTypeExtensionsString()	An arbitrary extension to append to the end of the UDT create type command.
String	getCreateUserDefinedTypeKindString()	The kind of user-defined type to create, or the empty string if this does not need to be specified.
String	getCurrentSchemaCommand()	Get the SQL command used to retrieve the current schema name.
String	getCurrentTimestampSelectString()	The command used to retrieve the current timestamp from the database.
int	getDefaultDecimalPrecision()	This is the default precision for a generated column of exact numeric type DECIMAL or NUMERIC mapped to a BigInteger or BigDecimal.
long	getDefaultLobLength()	This is the default length for a generated column of type BLOB or CLOB mapped to Blob or Clob, if LOB columns have a length in this dialect.
boolean	getDefaultNonContextualLobCreation()	The default value to use for the configuration property "hibernate.jdbc.lob.non_contextual_creation".
Properties	getDefaultProperties()	Retrieve a set of default Hibernate properties for this database.
int	getDefaultStatementBatchSize()	The default value to use for the configuration property "hibernate.jdbc.batch_size".
int	getDefaultTimestampPrecision()	This is the default precision for a generated column of type TIMESTAMP mapped to a Timestamp or LocalDateTime.
boolean	getDefaultUseGetGeneratedKeys()	The default value to use for the configuration property "hibernate.jdbc.use_get_generated_keys".
String	getDisableConstraintsStatement()	A SQL statement that temporarily disables foreign key constraint checking for all tables.
String	getDisableConstraintStatement(String tableName, String name)	A SQL statement that temporarily disables checking of the given foreign key constraint.
int	getDoublePrecision()	This is the default precision for a generated column mapped to a Java Double or double.
String[]	getDropCatalogCommand(String catalogName)	Get the SQL command used to drop the named catalog.
String	getDropForeignKeyString()	The subcommand of the alter table command used to drop a foreign key constraint, usually drop constraint.
String[]	getDropSchemaCommand(String schemaName)	Get the SQL command used to drop the named schema.
String	getDropTableString(String tableName)	The command used to drop a table with the given name, usually drop table tab_name.
String	getDropUniqueKeyString()	The subcommand of the alter table command used to drop a unique key constraint.
String	getEnableConstraintsStatement()	A SQL statement that re-enables foreign key constraint checking for all tables.
String	getEnableConstraintStatement(String tableName, String name)	A SQL statement that re-enables checking of the given foreign key constraint.
String	getEnumTypeDeclaration(String name, String[] values)	If this database has a special MySQL-style enum column type, return the type declaration for the given enumeration of values.
SchemaManagementTool	getFallbackSchemaManagementTool(Map<String,Object> configurationValues, ServiceRegistryImplementor registry)	The SchemaManagementTool to use if none is explicitly specified.
SqmMultiTableInsertStrategy	getFallbackSqmInsertStrategy(EntityMappingType entityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)	The SqmMultiTableInsertStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableInsertStrategy().
SqmMultiTableMutationStrategy	getFallbackSqmMutationStrategy(EntityMappingType entityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)	The SqmMultiTableMutationStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableMutationStrategy().
int	getFloatPrecision()	This is the default precision for a generated column mapped to a Java Float or float.
Exporter<ForeignKey>	getForeignKeyExporter()	Get an Exporter for ForeignKeys, usually StandardForeignKeyExporter.
String	getForUpdateNowaitString()	Retrieves the FOR UPDATE NOWAIT syntax specific to this dialect.
String	getForUpdateNowaitString(String aliases)	Get the FOR UPDATE OF column_list NOWAIT fragment appropriate for this dialect, given the aliases of the columns to be write locked.
String	getForUpdateSkipLockedString()	Retrieves the FOR UPDATE SKIP LOCKED syntax specific to this dialect.
String	getForUpdateSkipLockedString(String aliases)	Get the FOR UPDATE OF column_list SKIP LOCKED fragment appropriate for this dialect, given the aliases of the columns to be write locked.
String	getForUpdateString()	Get the string to append to SELECT statements to acquire pessimistic UPGRADE locks for this dialect.
String	getForUpdateString(String aliases)	Get the FOR UPDATE OF column_list fragment appropriate for this dialect, given the aliases of the columns to be write locked.
String	getForUpdateString(String aliases, LockOptions lockOptions)	Get the FOR UPDATE OF or FOR SHARE OF fragment appropriate for this dialect, given the aliases of the columns to be locked.
String	getForUpdateString(LockMode lockMode)	Given a LockMode, determine the appropriate for update fragment to use to obtain the lock.
String	getForUpdateString(LockOptions lockOptions)	Given a set of LockOptions (lock level, timeout), determine the appropriate for update fragment to use to obtain the lock.
long	getFractionalSecondPrecisionInNanos()	The "native" precision for arithmetic with datetimes and day-to-second durations.
SelectItemReferenceStrategy	getGroupBySelectItemReferenceStrategy()	Determine how selected items are referenced in the group by clause.
HqlTranslator	getHqlTranslator()	Return an HqlTranslator specific to this dialect, or null to use the standard translator.
IdentityColumnSupport	getIdentityColumnSupport()	Get the appropriate IdentityColumnSupport for this dialect.
Exporter<Index>	getIndexExporter()	Get an Exporter for Indexes, usually StandardIndexExporter.
int	getInExpressionCountLimit()	Return the limit that the underlying database places on the number of elements in an IN predicate.
Set<String>	getKeywords()	The keywords of this SQL dialect.
LimitHandler	getLimitHandler()	Obtain a LimitHandler that implements pagination support for Query.setMaxResults(int) and Query.setFirstResult(int).
LobMergeStrategy	getLobMergeStrategy()	Get the LobMergeStrategy to use, Dialect.NEW_LOCATOR_LOB_MERGE_STRATEGY by default.
LockingStrategy	getLockingStrategy(EntityPersister lockable, LockMode lockMode)	A LockingStrategy which is able to acquire a database-level lock with the specified level.
RowLockStrategy	getLockRowIdentifier(LockMode lockMode)	Obtain a RowLockStrategy for the given LockMode.
String	getLowercaseFunction()	The name of the SQL function that transforms a string to lowercase, almost always lower.
int	getMaxAliasLength()	What is the maximum length Hibernate can use for generated aliases?
int	getMaxIdentifierLength()	What is the maximum identifier length supported by this dialect?
int	getMaxNVarcharCapacity()	The longest possible length of a Types.NVARCHAR-like column.
int	getMaxNVarcharLength()	The biggest size value that can be supplied as argument to a Types.NVARCHAR-like type.
int	getMaxVarbinaryCapacity()	The longest possible length of a Types.VARBINARY-like column.
int	getMaxVarbinaryLength()	The biggest size value that can be supplied as argument to a Types.VARBINARY-like type.
int	getMaxVarcharCapacity()	The longest possible length of a Types.VARCHAR-like column.
int	getMaxVarcharLength()	The biggest size value that can be supplied as argument to a Types.VARCHAR-like type.
DatabaseVersion	getMinimumSupportedVersion()	Get the version of the SQL dialect that is the minimum supported by this implementation.
MultiKeyLoadSizingStrategy	getMultiKeyLoadSizingStrategy()	The strategy used to determine the appropriate number of keys to load in a single SQL query with multi-key loading.
NameQualifierSupport	getNameQualifierSupport()	The support for qualified identifiers.
NationalizationSupport	getNationalizationSupport()	Determines whether this database requires the use of explicitly nationalized character (Unicode) data types.
String	getNativeIdentifierGeneratorStrategy()	The name identifying the "native" id generation strategy for this dialect.
ParameterMarkerStrategy	getNativeParameterMarkerStrategy()	Support for native parameter markers.
String	getNoColumnsInsertString()	Deprecated.
String	getNullColumnString()	The keyword used to specify a nullable column, usually "", but sometimes " null".
String	getNullColumnString(String columnType)	The keyword used to specify a nullable column of the given SQL type.
NullOrdering	getNullOrdering()	Returns the default ordering of null.
int	getParameterCountLimit()	Return the limit that the underlying database places on the number of parameters that can be defined for a PreparedStatement.
int	getPreferredSqlTypeCodeForArray()	The JDBC type code to use for mapping properties of basic Java array or Collection types.
int	getPreferredSqlTypeCodeForBoolean()	The JDBC type code to use for mapping properties of Java type boolean.
String	getQueryHintString(String query, String hints)	Apply a hint to the given SQL query.
String	getQueryHintString(String query, List<String> hintList)	Apply a hint to the given SQL query.
String	getQuerySequencesString()	Get the select command used retrieve the names of all sequences.
String	getReadLockString(int timeout)	Get the string to append to SELECT statements to acquire READ locks for this dialect.
String	getReadLockString(String aliases, int timeout)	Get the string to append to SELECT statements to acquire READ locks for this dialect, given the aliases of the columns to be read locked.
RowLockStrategy	getReadRowLockStrategy()	The row lock strategy to use for read locks.
ResultSet	getResultSet(CallableStatement statement)	Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the OUT parameter.
ResultSet	getResultSet(CallableStatement statement, int position)	Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the positional OUT parameter.
ResultSet	getResultSet(CallableStatement statement, String name)	Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the named OUT parameter.
String	getRowIdColumnString(String rowId)	If this dialect requires that the rowid column be declared explicitly, return the DDL column definition.
SchemaNameResolver	getSchemaNameResolver()	Get the strategy for determining the schema name from a JDBC Connection, usually DefaultSchemaNameResolver.
String	getSelectClauseNullString(int sqlType, TypeConfiguration typeConfiguration)	Given a JDBC type code, return the expression for a literal null value of that type, to use in a select clause.
String	getSelectGUIDString()	Get the command used to select a GUID from the database.
Exporter<Sequence>	getSequenceExporter()	Get an Exporter for Sequences, usually StandardSequenceExporter.
SequenceInformationExtractor	getSequenceInformationExtractor()	A SequenceInformationExtractor which is able to extract SequenceInformation from the JDBC result set returned when Dialect.getQuerySequencesString() is executed.
SequenceSupport	getSequenceSupport()	Get the appropriate SequenceSupport for this dialect.
Dialect.SizeStrategy	getSizeStrategy()	A custom Dialect.SizeStrategy for column types.
SqlAstTranslatorFactory	getSqlAstTranslatorFactory()	Return a SqlAstTranslatorFactory specific to this dialect, or null to use the standard translator.
SqmTranslatorFactory	getSqmTranslatorFactory()	Return a SqmTranslatorFactory specific to this dialect, or null to use the standard translator.
TemporaryTableKind	getSupportedTemporaryTableKind()	The kind of temporary tables that are supported on this database.
Cleaner	getTableCleaner()	Get a schema Cleaner, usually StandardTableCleaner.
String	getTableComment(String comment)	Get the comment into a form supported for table definition.
Exporter<Table>	getTableExporter()	Get an Exporter for Tables, usually StandardTableExporter.
TableMigrator	getTableMigrator()	Get a TableMigrator, usually StandardTableMigrator.
String	getTableTypeString()	An arbitrary fragment appended to the end of the create table statement.
AfterUseAction	getTemporaryTableAfterUseAction()	The action to take after finishing use of a temporary table.
BeforeUseAction	getTemporaryTableBeforeUseAction()	The action to take before beginning use of a temporary table.
String	getTemporaryTableCreateCommand()	The command to create a temporary table.
String	getTemporaryTableCreateOptions()	An arbitrary SQL fragment appended to the end of the statement to create a temporary table, specifying dialect-specific options, or null if there are no options to specify.
TempTableDdlTransactionHandling	getTemporaryTableDdlTransactionHandling()	The sort of transaction handling to use when creating or dropping temporary tables.
String	getTemporaryTableDropCommand()	The command to drop a temporary table.
TemporaryTableExporter	getTemporaryTableExporter()	Get a TemporaryTableExporter, usually StandardTemporaryTableExporter.
String	getTemporaryTableTruncateCommand()	The command to truncate a temporary table.
TimeZoneSupport	getTimeZoneSupport()	How the dialect supports time zone types like Types.TIMESTAMP_WITH_TIMEZONE.
String	getTruncateTableStatement(String tableName)	A SQL statement that truncates the given table.
String[]	getTruncateTableStatements(String[] tableNames)	A SQL statement or statements that truncate the given tables.
UniqueDelegate	getUniqueDelegate()	Get the UniqueDelegate supported by this dialect
Exporter<Constraint>	getUniqueKeyExporter()	Get an Exporter for unique key Constraints, usually StandardUniqueKeyExporter.
String	getUserDefinedTypeComment(String comment)	Get the comment into a form supported for UDT definition.
Exporter<UserDefinedType>	getUserDefinedTypeExporter()	Get an Exporter for UserDefinedTypes, usually StandardUserDefinedTypeExporter.
DatabaseVersion	getVersion()	Get the version of the SQL dialect that is the target of this instance.
ViolatedConstraintNameExtractor	getViolatedConstraintNameExtractor()	A ViolatedConstraintNameExtractor for extracting the name of a violated constraint from a SQLException.
Dialect	getWrappedDialect()	Exposed so to allow code needing to know the implementation.
String	getWriteLockString(int timeout)	Get the string to append to SELECT statements to acquire pessimistic WRITE locks for this dialect.
String	getWriteLockString(String aliases, int timeout)	Get the string to append to SELECT statements to acquire WRITE locks for this dialect, given the aliases of the columns to be write locked.
RowLockStrategy	getWriteRowLockStrategy()	The row lock strategy to use for write locks.
boolean	hasAlterTable()	Does this dialect support the ALTER TABLE syntax?
boolean	hasDataTypeBeforeGeneratedAs()	Is an explicit column type required for generated as columns?
boolean	hasSelfReferentialForeignKeyBug()	Does the database/driver have bug in deleting rows that refer to other rows being deleted in the same query?
protected final void	initDefaultProperties()	Set appropriate default values for configuration properties.
void	initializeFunctionRegistry(FunctionContributions functionContributions)	Initialize the given registry with any dialect-specific functions.
boolean	isAnsiNullOn()	Deprecated.
boolean	isCurrentTimestampSelectStringCallable()	Is the command returned by Dialect.getCurrentTimestampSelectString() treated as callable?
boolean	isEmptyStringTreatedAsNull()	Return whether the dialect considers an empty string value to be null.
boolean	isJdbcLogWarningsEnabledByDefault()	Is JDBC statement warning logging enabled by default?
char	openQuote()	The character specific to this dialect used to begin a quoted identifier.
int	ordinal()	Determines order in which the contributions will be applied (lowest ordinal first).
String	prependComment(String sql, String comment)	Prepend a comment to the given SQL fragment.
boolean	qualifyIndexName()	Do we need to qualify index names with the schema name?
String	quote(String name)	Apply dialect-specific quoting if the given name is quoted using backticks.
void	registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)	Register ANSI-standard column types using the length limits defined by Dialect.getMaxVarcharLength(), Dialect.getMaxNVarcharLength(), and Dialect.getMaxVarbinaryLength().
protected final void	registerDefaultKeywords()	Register the reserved words of ANSI-standard SQL as keywords.
void	registerKeyword(String word)	Register a keyword.
void	registerKeywords(DialectResolutionInfo info)	Register the reserved words reported by the JDBC driver as keywords.
int	registerResultSetOutParameter(CallableStatement statement, int position)	Registers a parameter capable of returning a ResultSet by position, either an OUT parameter, or a REF_CURSOR parameter as defined in Java 8.
int	registerResultSetOutParameter(CallableStatement statement, String name)	Registers a parameter capable of returning a ResultSet by name, either an OUT parameter, or a REF_CURSOR parameter as defined in Java 8.
boolean	requiresCastForConcatenatingNonStrings()	Does this dialect/database require casting of non-string arguments in the concat() function?
boolean	requiresFloatCastingOfIntegerDivision()	Does this dialect require that integer divisions be wrapped in cast() calls to tell the db parser the expected type.
boolean	requiresParensForTupleCounts()	If Dialect.supportsTupleCounts() is true, does this dialect require the tuple to be delimited with parentheses?
boolean	requiresParensForTupleDistinctCounts()	If Dialect.supportsTupleDistinctCounts() is true, does this dialect require the tuple to be delimited with parentheses?
Integer	resolveSqlTypeCode(String typeName, String baseTypeName, TypeConfiguration typeConfiguration)	Resolves the SqlTypes type code for the given column type name as reported by the database and the base type name (i.e.
Integer	resolveSqlTypeCode(String columnTypeName, TypeConfiguration typeConfiguration)	Resolves the SqlTypes type code for the given column type name as reported by the database, or null if it can't be resolved.
JdbcType	resolveSqlTypeDescriptor(String columnTypeName, int jdbcTypeCode, int precision, int scale, JdbcTypeRegistry jdbcTypeRegistry)	Assigns an appropriate JdbcType to a column of a JDBC result set based on the column type name, JDBC type code, precision, and scale.
int	resolveSqlTypeLength(String columnTypeName, int jdbcTypeCode, int precision, int scale, int displaySize)	Determine the length/precision of a column based on information in the JDBC ResultSetMetaData.
String	rowId(String rowId)	The name of a rowid-like pseudo-column which acts as a high-performance row locator, or null if this dialect has no such pseudo-column.
int	rowIdSqlType()	The JDBC type code of the rowid-like pseudo-column which acts as a high-performance row locator.
boolean	supportsAlterColumnType()	Does this dialect support modifying the type of an existing column?
boolean	supportsBindAsCallableArgument()	Does this dialect support using a JDBC bind parameter as an argument to a function or procedure call?
boolean	supportsBitType()	Does this dialect have a true SQL BIT type with just two values (0 and 1) or, even better, a proper SQL BOOLEAN type, or does Types.BIT get mapped to a numeric type with more than two values?
boolean	supportsCascadeDelete()	Does this dialect support on delete actions in foreign key definitions?
boolean	supportsCaseInsensitiveLike()	Does this dialect support case-insensitive LIKE comparisons?
boolean	supportsCircularCascadeDeleteConstraints()	Does this dialect support definition of cascade delete constraints which can cause circular chains?
boolean	supportsColumnCheck()	Does this dialect support column-level check constraints?
boolean	supportsCommentOn()	Does this dialect support commenting on tables and columns?
boolean	supportsCurrentTimestampSelection()	Does this dialect support some way to retrieve the current timestamp value from the database?
boolean	supportsDistinctFromPredicate()	Does this dialect support some kind of distinct from predicate?
boolean	supportsExistsInSelect()	Does the dialect support an exists statement in the select clause?
boolean	supportsExpectedLobUsagePattern()	"Expected" LOB usage pattern is such that I can perform an insert via prepared statement with a parameter binding for a LOB value without crazy casting to JDBC driver implementation-specific classes.
boolean	supportsFetchClause(FetchClauseType type)	Does this dialect support the given FETCH clause type.
boolean	supportsFractionalTimestampArithmetic()	Whether the database supports adding a fractional interval to a timestamp, for example timestamp + 0.5 second.
boolean	supportsIfExistsAfterAlterTable()	For an alter table, can the phrase if exists be applied?
boolean	supportsIfExistsAfterConstraintName()	For dropping a constraint with an alter table, can the phrase if exists be applied after the constraint name?
boolean	supportsIfExistsAfterTableName()	For dropping a table, can the phrase if exists be applied after the table name?
boolean	supportsIfExistsAfterTypeName()	For dropping a type, can the phrase if exists be applied after the type name?
boolean	supportsIfExistsBeforeConstraintName()	For dropping a constraint with an alter table statement, can the phrase if exists be applied before the constraint name?
boolean	supportsIfExistsBeforeTableName()	For dropping a table, can the phrase if exists be applied before the table name?
boolean	supportsIfExistsBeforeTypeName()	For dropping a type, can the phrase if exists be applied before the type name?
boolean	supportsInsertReturning()	Does this dialect fully support returning arbitrary generated column values after execution of an insert statement, using native SQL syntax?
boolean	supportsInsertReturningGeneratedKeys()	Does this dialect fully support returning arbitrary generated column values after execution of an insert statement, using the JDBC method Connection.prepareStatement(String, String[]).
boolean	supportsJdbcConnectionLobCreation(DatabaseMetaData databaseMetaData)	Check whether the JDBC Connection supports creating LOBs via Connection.createBlob(), Connection.createNClob(), or Connection.createClob().
boolean	supportsLateral()	Does this dialect support the SQL lateral keyword or a proprietary alternative?
boolean	supportsLobValueChangePropagation()	Does the dialect support propagating changes to LOB values back to the database? Talking about mutating the internal value of the locator, as opposed to supplying a new locator instance.
boolean	supportsLockTimeouts()	Does this dialect support specifying timeouts when requesting locks.
boolean	supportsMaterializedLobAccess()	Check whether the JDBC driver allows setting LOBs via PreparedStatement.setBytes(int, byte[]), PreparedStatement.setNString(int, String), or PreparedStatement.setString(int, String) APIs.
boolean	supportsNamedParameters(DatabaseMetaData databaseMetaData)	Override DatabaseMetaData.supportsNamedParameters().
boolean	supportsNoColumnsInsert()	Is the INSERT statement is allowed to contain no columns?
boolean	supportsNonQueryWithCTE()	Does this dialect support insert, update, and delete statements with Common Table Expressions (CTEs)?
boolean	supportsNoWait()	Does this dialect support NO_WAIT timeout.
boolean	supportsNullPrecedence()	Does this dialect support nulls first and nulls last?
boolean	supportsOffsetInSubquery()	Does this dialect support offset in subqueries?
boolean	supportsOrderByInSubquery()	Does this dialect support the order by clause in subqueries?
boolean	supportsOrdinalSelectItemReference()	Does this dialect support references to result variables (i.e, select items) by column positions (1-origin) as defined by the select clause?
boolean	supportsOuterJoinForUpdate()	Does this dialect support FOR UPDATE in conjunction with outer-joined rows?
boolean	supportsPartitionBy()	Does is dialect support partition by?
boolean	supportsPredicateAsExpression()	Whether a predicate like a > 0 can appear in an expression context, for example, in a select list item.
boolean	supportsRecursiveCTE()	Does this dialect/database support recursive CTEs?
boolean	supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()	Does this dialect support asking the result set its positioning information on forward-only cursors?
boolean	supportsSkipLocked()	Does this dialect support SKIP_LOCKED timeout.
boolean	supportsStandardArrays()	Does this database have native support for ANSI SQL standard arrays which are expressed in terms of the element type name: integer array.
boolean	supportsStandardCurrentTimestampFunction()	Does this dialect have an ANSI SQL current_timestamp function?
boolean	supportsSubqueryInSelect()	Does this dialect support subqueries in the select clause?
boolean	supportsSubqueryOnMutatingTable()	Does this dialect support referencing the table being mutated in a subquery? The "table being mutated" is the table referenced in an update or delete query.
boolean	supportsSubselectAsInPredicateLHS()	Is a subselect supported as the left-hand side (LHS) of an IN predicates?
boolean	supportsTableCheck()	Does this dialect support table-level check constraints?
boolean	supportsTemporalLiteralOffset()	Does this dialect supports timezone offsets in temporal literals.
boolean	supportsTemporaryTablePrimaryKey()	Does this database support primary keys for temporary tables?
boolean	supportsTemporaryTables()	Does this database have some sort of support for temporary tables?
boolean	supportsTruncateWithCast()	Does this dialect support truncation of values to a specified length via a cast?
boolean	supportsTupleCounts()	Does this dialect support count(a,b)?
boolean	supportsTupleDistinctCounts()	Does this dialect support count(distinct a,b)?
boolean	supportsUnboundedLobLocatorMaterialization()	Is it supported to materialize a LOB locator outside the transaction in which it was created?
boolean	supportsUnionAll()	Does this dialect support UNION ALL?
boolean	supportsUnionInSubquery()	Does this dialect support UNION in a subquery.
boolean	supportsValuesList()	Does this dialect support values lists of form VALUES (1), (2), (3)?
boolean	supportsValuesListForInsert()	Does this dialect support values lists of form VALUES (1), (2), (3) in insert statements?
boolean	supportsWait()	Does this dialect support WAIT timeout.
boolean	supportsWindowFunctions()	Does this dialect support window functions like row_number() over (..)?
String	timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType)	Obtain a pattern for the SQL equivalent to a timestampadd() function call.
String	timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType)	Obtain a pattern for the SQL equivalent to a timestampdiff() function call.
String	toBooleanValueString(boolean bool)	The SQL literal expression representing the given boolean value.
String	toQuotedIdentifier(String name)	Apply dialect-specific quoting.
String	toString()
String	transformSelectString(String select)	Meant as a means for end users to affect the select strings being sent to the database and perhaps manipulate them in some fashion.
String	translateDurationField(TemporalUnit unit)	Return the name used to identify the given unit of duration as an argument to #timestampadd() or #timestampdiff(), or of this dialect's equivalent functions.
String	translateExtractField(TemporalUnit unit)	Return the name used to identify the given field as an argument to the extract() function, or of this dialect's equivalent function.
String	trimPattern(TrimSpec specification, boolean isWhitespace)	Obtain a pattern for the SQL equivalent to a trim() function call.
boolean	useConnectionToCreateLob()	Should BLOB, CLOB, and NCLOB be created solely using respectively Connection.createBlob(), Connection.createClob(), and Connection.createNClob().
boolean	useFollowOnLocking(String sql, QueryOptions queryOptions)	Some dialects have trouble applying pessimistic locking depending upon what other query options are specified (paging, ordering, etc).
boolean	useInputStreamToInsertBlob()	Should LOBs (both BLOB and CLOB) be bound using stream operations, that is, using PreparedStatement.setBinaryStream(int, java.io.InputStream, int)).
boolean	useMaterializedLobWhenCapacityExceeded()	Whether to switch: from VARCHAR-like types to SqlTypes.MATERIALIZED_CLOB types when the requested size for a type exceeds the Dialect.getMaxVarcharCapacity(), from NVARCHAR-like types to SqlTypes.MATERIALIZED_NCLOB types when the requested size for a type exceeds the Dialect.getMaxNVarcharCapacity(), and from VARBINARY-like types to SqlTypes.MATERIALIZED_BLOB types when the requested size for a type exceeds the Dialect.getMaxVarbinaryCapacity().

Methods inherited from class org.hibernate.dialect.Dialect

appendCheckConstraintOptions, doesRoundTemporalOnOverflow, getBeforeDropStatement, getCheckCondition, getCheckCondition, getCheckCondition, getCheckCondition, getCheckConstraintString, getCreateEnumTypeCommand, getCreateEnumTypeCommand, getCrossReferenceParentTableFilter, getDefaultIntervalSecondScale, getDmlTargetColumnQualifierSupport, getDropEnumTypeCommand, getDropEnumTypeCommand, getEnumTypeDeclaration, getFunctionalDependencyAnalysisSupport, getTimeoutInSeconds, isLob, quoteCollation, supportsBatchUpdates, supportsConflictClauseForInsertCTE, supportsFromClauseInUpdate, supportsInsertReturningRowId, supportsIsTrue, supportsNationalizedMethods, supportsRefCursors, supportsTableOptions, supportsUpdateReturning, unquoteGetGeneratedKeys, useArrayForMultiValuedParameters, useCrossReferenceForeignKeys

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

wrapped

protected final Dialect wrapped

Constructor Details

DialectDelegateWrapper

public DialectDelegateWrapper(Dialect wrapped)

Method Details

extractRealDialect

public static Dialect extractRealDialect(Dialect dialect)

Extract the wrapped dialect, recursively until a non-wrapped implementation is found; this is useful for all the code needing to know "of which type" the underlying implementation actually is.

Parameters:

dialect - the Dialect to unwrap

Returns:

a Dialect implementation which is not a DialectDelegateWrapper; could be the same as the argument.

getWrappedDialect

public Dialect getWrappedDialect()

Exposed so to allow code needing to know the implementation.

Returns:

the wrapped Dialect

checkVersion

protected final void checkVersion()

Overrides:

checkVersion in class Dialect

registerDefaultKeywords

protected final void registerDefaultKeywords()

Description copied from class: Dialect

Register the reserved words of ANSI-standard SQL as keywords.

Overrides:

registerDefaultKeywords in class Dialect

See Also:

• AnsiSqlKeywords

initDefaultProperties

protected final void initDefaultProperties()

Description copied from class: Dialect

Set appropriate default values for configuration properties.

This default implementation sets "hibernate.jdbc.batch_size", "hibernate.jdbc.lob.non_contextual_creation", and "hibernate.jdbc.use_get_generated_keys" to defaults determined by calling Dialect.getDefaultStatementBatchSize(), Dialect.getDefaultNonContextualLobCreation(), and Dialect.getDefaultUseGetGeneratedKeys().

An implementation may set additional configuration properties, but this is discouraged.

Overrides:

initDefaultProperties in class Dialect

registerColumnTypes

public void registerColumnTypes(TypeContributions typeContributions,
 ServiceRegistry serviceRegistry)

Description copied from class: Dialect

Register ANSI-standard column types using the length limits defined by Dialect.getMaxVarcharLength(), Dialect.getMaxNVarcharLength(), and Dialect.getMaxVarbinaryLength().

This method is always called when a Dialect is instantiated.

Overrides:

registerColumnTypes in class Dialect

columnType

public String columnType(int sqlTypeCode)

Description copied from class: Dialect

The database column type name for a given JDBC type code defined in Types or SqlTypes. This default implementation returns the ANSI-standard type name.

This method may be overridden by concrete Dialects as an alternative to Dialect.registerColumnTypes(TypeContributions, ServiceRegistry) for simple registrations.

Note that:

1. Implementations of this method are expected to define a sensible mapping forTypes.NCLOB Types.NCHAR, and Types.NVARCHAR. On some database, these types are simply remapped to CLOB, CHAR, and VARCHAR.
2. Mappings for Types.TIMESTAMP and Types.TIMESTAMP_WITH_TIMEZONE should support explicit specification of precision if possible.
3. As specified by DdlTypeRegistry.getDescriptor(int), this method never receives Types.LONGVARCHAR, Types.LONGNVARCHAR, nor Types.LONGVARBINARY, which are considered synonyms for their non-LONG counterparts.
4. On the other hand, the types SqlTypes.LONG32VARCHAR, SqlTypes.LONG32NVARCHAR, and SqlTypes.LONG32VARBINARY are not synonyms, and implementations of this method must define sensible mappings, for example to database-native TEXT or CLOB types.

Overrides:

columnType in class Dialect

Parameters:

sqlTypeCode - a SQL type code

Returns:

a column type name, with $l, $p, $s placeholders for length, precision, scale

See Also:

• SqlTypes

castType

public String castType(int sqlTypeCode)

Description copied from class: Dialect

The SQL type to use in cast( ... as ... ) expressions when casting to the target type represented by the given JDBC type code.

Overrides:

castType in class Dialect

Parameters:

sqlTypeCode - The JDBC type code representing the target type

Returns:

The SQL type to use in cast()

registerKeywords

public void registerKeywords(DialectResolutionInfo info)

Description copied from class: Dialect

Register the reserved words reported by the JDBC driver as keywords.

Overrides:

registerKeywords in class Dialect

See Also:

• DatabaseMetaData.getSQLKeywords()

getVersion

public DatabaseVersion getVersion()

Description copied from class: Dialect

Get the version of the SQL dialect that is the target of this instance.

Overrides:

getVersion in class Dialect

getMinimumSupportedVersion

public DatabaseVersion getMinimumSupportedVersion()

Description copied from class: Dialect

Get the version of the SQL dialect that is the minimum supported by this implementation.

Overrides:

getMinimumSupportedVersion in class Dialect

resolveSqlTypeCode

public Integer resolveSqlTypeCode(String columnTypeName,
 TypeConfiguration typeConfiguration)

Description copied from class: Dialect

Resolves the SqlTypes type code for the given column type name as reported by the database, or null if it can't be resolved.

Overrides:

resolveSqlTypeCode in class Dialect

resolveSqlTypeCode

public Integer resolveSqlTypeCode(String typeName,
 String baseTypeName,
 TypeConfiguration typeConfiguration)

Description copied from class: Dialect

Resolves the SqlTypes type code for the given column type name as reported by the database and the base type name (i.e. without precision, length and scale), or null if it can't be resolved.

Overrides:

resolveSqlTypeCode in class Dialect

getNativeParameterMarkerStrategy

public ParameterMarkerStrategy getNativeParameterMarkerStrategy()

Description copied from class: Dialect

Support for native parameter markers.

This is generally dependent on both the database and the driver.

Overrides:

getNativeParameterMarkerStrategy in class Dialect

Returns:

May return null to indicate that the JDBC standard strategy should be used

resolveSqlTypeDescriptor

public JdbcType resolveSqlTypeDescriptor(String columnTypeName,
 int jdbcTypeCode,
 int precision,
 int scale,
 JdbcTypeRegistry jdbcTypeRegistry)

Description copied from class: Dialect

Assigns an appropriate JdbcType to a column of a JDBC result set based on the column type name, JDBC type code, precision, and scale.

Overrides:

resolveSqlTypeDescriptor in class Dialect

Parameters:

columnTypeName - the column type name

jdbcTypeCode - the type code

precision - the precision or 0

scale - the scale or 0

Returns:

an appropriate instance of JdbcType

resolveSqlTypeLength

public int resolveSqlTypeLength(String columnTypeName,
 int jdbcTypeCode,
 int precision,
 int scale,
 int displaySize)

Description copied from class: Dialect

Determine the length/precision of a column based on information in the JDBC ResultSetMetaData. Note that what JDBC reports as a "precision" might actually be the column length.

Overrides:

resolveSqlTypeLength in class Dialect

Parameters:

columnTypeName - the name of the column type

jdbcTypeCode - the JDBC type code of the column type

precision - the (numeric) precision or (character) length of the column

scale - the scale of a numeric column

displaySize - the display size of the column

Returns:

the precision or length of the column

getEnumTypeDeclaration

public String getEnumTypeDeclaration(String name,
 String[] values)

Description copied from class: Dialect

If this database has a special MySQL-style enum column type, return the type declaration for the given enumeration of values.

If the database has no such type, return null.

Overrides:

getEnumTypeDeclaration in class Dialect

values - the enumerated values of the type

Returns:

the DDL column type declaration

getCheckCondition

public String getCheckCondition(String columnName,
 String[] values)

Description copied from class: Dialect

Render a SQL check condition for a column that represents an enumerated value by its string representation or a given list of values (with NULL value allowed).

Overrides:

getCheckCondition in class Dialect

Returns:

a SQL expression that will occur in a check constraint

getCheckCondition

public String getCheckCondition(String columnName,
 long min,
 long max)

Description copied from class: Dialect

Render a SQL check condition for a column that represents an enumerated value. by its ordinal representation.

Overrides:

getCheckCondition in class Dialect

Returns:

a SQL expression that will occur in a check constraint

contributeFunctions

public void contributeFunctions(FunctionContributions functionContributions)

Description copied from interface: FunctionContributor

Contribute functions

Specified by:

contributeFunctions in interface FunctionContributor

Overrides:

contributeFunctions in class Dialect

Parameters:

functionContributions - The target for the contributions

ordinal

public int ordinal()

Description copied from interface: FunctionContributor

Determines order in which the contributions will be applied (lowest ordinal first).

The range 0-500 is reserved for Hibernate, range 500-1000 for libraries and 1000-Integer.MAX_VALUE for user-defined FunctionContributors.

Contributions from higher precedence contributors (higher numbers) effectively override contributions from lower precedence. E.g. if a contributor with precedence 1000 contributes a function named "max", that will override Hibernate's standard function of that name.

Specified by:

ordinal in interface FunctionContributor

Overrides:

ordinal in class Dialect

Returns:

the ordinal for this FunctionContributor

initializeFunctionRegistry

public void initializeFunctionRegistry(FunctionContributions functionContributions)

Description copied from class: Dialect

Initialize the given registry with any dialect-specific functions.

Support for certain SQL functions is required, and if the database does not support a required function, then the dialect must define a way to emulate it.

These required functions include the functions defined by the JPA query language specification:

• avg(arg) - aggregate function
• count([distinct ]arg) - aggregate function
• max(arg) - aggregate function
• min(arg) - aggregate function
• sum(arg) - aggregate function

• coalesce(arg0, arg1, ...)
• nullif(arg0, arg1)

• lower(arg)
• upper(arg)
• length(arg)
• concat(arg0, arg1, ...)
• locate(pattern, string[, start])
• substring(string, start[, length])
• trim([[spec ][character ]from] string)

• abs(arg)
• mod(arg0, arg1)
• sqrt(arg)

• current date
• current time
• current timestamp

Along with an additional set of functions defined by ANSI SQL:

• any(arg) - aggregate function
• every(arg) - aggregate function

• var_samp(arg) - aggregate function
• var_pop(arg) - aggregate function
• stddev_samp(arg) - aggregate function
• stddev_pop(arg) - aggregate function

• cast(arg as Type)
• extract(field from arg)

• ln(arg)
• exp(arg)
• power(arg0, arg1)
• floor(arg)
• ceiling(arg)

• position(pattern in string)
• substring(string from start[ for length])
• overlay(string placing replacement from start[ for length])

And the following functions for working with java.time types:

• local date
• local time
• local datetime
• offset datetime
• instant

And a number of additional "standard" functions:

• left(string, length)
• right(string, length)
• replace(string, pattern, replacement)
• pad(string with length spec[ character])
• repeat(string, times)

• pi
• log10(arg)
• log(base, arg)
• sign(arg)
• sin(arg)
• cos(arg)
• tan(arg)
• asin(arg)
• acos(arg)
• atan(arg)
• atan2(arg0, arg1)
• round(arg0[, arg1])
• truncate(arg0[, arg1])
• sinh(arg)
• tanh(arg)
• cosh(arg)
• least(arg0, arg1, ...)
• greatest(arg0, arg1, ...)
• degrees(arg)
• radians(arg)
• bitand(arg1, arg1)
• bitor(arg1, arg1)
• bitxor(arg1, arg1)

• format(datetime as pattern)
• collate(string as collation)
• str(arg) - synonym of cast(a as String)
• ifnull(arg0, arg1) - synonym of coalesce(a, b)

Finally, the following functions are defined as abbreviations for extract(), and desugared by the parser:

• second(arg) - synonym of extract(second from a)
• minute(arg) - synonym of extract(minute from a)
• hour(arg) - synonym of extract(hour from a)
• day(arg) - synonym of extract(day from a)
• month(arg) - synonym of extract(month from a)
• year(arg) - synonym of extract(year from a)

Note that according to this definition, the second() function returns a floating point value, contrary to the integer type returned by the native function with this name on many databases. Thus, we don't just naively map these HQL functions to the native SQL functions with the same names.

Overrides:

initializeFunctionRegistry in class Dialect

currentDate

public String currentDate()

Description copied from class: Dialect

Translation of the HQL/JPQL current_date function, which maps to the Java type Date, and of the HQL local_date function which maps to the Java type LocalDate.

Overrides:

currentDate in class Dialect

currentTime

public String currentTime()

Description copied from class: Dialect

Translation of the HQL/JPQL current_time function, which maps to the Java type Time which is a time with no time zone. This contradicts ANSI SQL where current_time has the type TIME WITH TIME ZONE.

It is recommended to override this in dialects for databases which support localtime or time at local.

Overrides:

currentTime in class Dialect

currentTimestamp

public String currentTimestamp()

Description copied from class: Dialect

Translation of the HQL/JPQL current_timestamp function, which maps to the Java type Timestamp which is a datetime with no time zone. This contradicts ANSI SQL where current_timestamp has the type TIMESTAMP WITH TIME ZONE.

It is recommended to override this in dialects for databases which support localtimestamp or timestamp at local.

Overrides:

currentTimestamp in class Dialect

currentLocalTime

public String currentLocalTime()

Description copied from class: Dialect

Translation of the HQL local_time function, which maps to the Java type LocalTime which is a time with no time zone. It should usually be the same SQL function as for Dialect.currentTime().

It is recommended to override this in dialects for databases which support localtime or current_time at local.

Overrides:

currentLocalTime in class Dialect

currentLocalTimestamp

public String currentLocalTimestamp()

Description copied from class: Dialect

Translation of the HQL local_datetime function, which maps to the Java type LocalDateTime which is a datetime with no time zone. It should usually be the same SQL function as for Dialect.currentTimestamp().

It is recommended to override this in dialects for databases which support localtimestamp or current_timestamp at local.

Overrides:

currentLocalTimestamp in class Dialect

currentTimestampWithTimeZone

public String currentTimestampWithTimeZone()

Description copied from class: Dialect

Translation of the HQL offset_datetime function, which maps to the Java type OffsetDateTime which is a datetime with a time zone. This in principle correctly maps to the ANSI SQL current_timestamp which has the type TIMESTAMP WITH TIME ZONE.

Overrides:

currentTimestampWithTimeZone in class Dialect

extractPattern

public String extractPattern(TemporalUnit unit)

Description copied from class: Dialect

Obtain a pattern for the SQL equivalent to an extract() function call. The resulting pattern must contain ?1 and ?2 placeholders for the arguments.

This method does not need to handle TemporalUnit.NANOSECOND, TemporalUnit.NATIVE, TemporalUnit.OFFSET, TemporalUnit.DATE, TemporalUnit.TIME, TemporalUnit.WEEK_OF_YEAR, or TemporalUnit.WEEK_OF_MONTH, which are already desugared by ExtractFunction.

Overrides:

extractPattern in class Dialect

Parameters:

unit - the first argument

castPattern

public String castPattern(CastType from,
 CastType to)

Description copied from class: Dialect

Obtain a pattern for the SQL equivalent to a cast() function call. The resulting pattern must contain ?1 and ?2 placeholders for the arguments.

Overrides:

castPattern in class Dialect

Parameters:

from - a CastType indicating the type of the value argument

to - a CastType indicating the type the value argument is cast to

trimPattern

public String trimPattern(TrimSpec specification,
 boolean isWhitespace)

Description copied from class: Dialect

Obtain a pattern for the SQL equivalent to a trim() function call. The resulting pattern must contain a ?1 placeholder for the argument of type String and a ?2 placeholder for the trim character if isWhitespace was false.

Overrides:

trimPattern in class Dialect

Parameters:

specification - leading, trailing or both

isWhitespace - true if the trim character is a whitespace and can be omitted, false if it must be explicit and a ?2 placeholder should be included in the pattern

supportsFractionalTimestampArithmetic

public boolean supportsFractionalTimestampArithmetic()

Description copied from class: Dialect

Whether the database supports adding a fractional interval to a timestamp, for example timestamp + 0.5 second.

Overrides:

supportsFractionalTimestampArithmetic in class Dialect

timestampdiffPattern

public String timestampdiffPattern(TemporalUnit unit,
 TemporalType fromTemporalType,
 TemporalType toTemporalType)

Description copied from class: Dialect

Obtain a pattern for the SQL equivalent to a timestampdiff() function call. The resulting pattern must contain ?1, ?2, and ?3 placeholders for the arguments.

Overrides:

timestampdiffPattern in class Dialect

Parameters:

unit - the first argument

fromTemporalType - true if the first argument is a timestamp, false if a date

toTemporalType - true if the second argument is

timestampaddPattern

public String timestampaddPattern(TemporalUnit unit,
 TemporalType temporalType,
 IntervalType intervalType)

Description copied from class: Dialect

Obtain a pattern for the SQL equivalent to a timestampadd() function call. The resulting pattern must contain ?1, ?2, and ?3 placeholders for the arguments.

Overrides:

timestampaddPattern in class Dialect

Parameters:

unit - The unit to add to the temporal

temporalType - The type of the temporal

intervalType - The type of interval to add or null if it's not a native interval

equivalentTypes

public boolean equivalentTypes(int typeCode1,
 int typeCode2)

Description copied from class: Dialect

Do the given JDBC type codes, as defined in Types represent essentially the same type in this dialect of SQL?

The default implementation treats NUMERIC and DECIMAL as the same type, and FLOAT, REAL, and DOUBLE as essentially the same type, since the ANSI SQL specification fails to meaningfully distinguish them.

The default implementation also treats VARCHAR, NVARCHAR, LONGVARCHAR, and LONGNVARCHAR as the same type, and BINARY and LONGVARBINARY as the same type, since Hibernate doesn't really differentiate these types.

On the other hand, integral types are not treated as equivalent, instead, Dialect.isCompatibleIntegralType(int, int) is responsible for determining if the types are compatible.

Overrides:

equivalentTypes in class Dialect

Parameters:

typeCode1 - the first column type info

typeCode2 - the second column type info

Returns:

true if the two type codes are equivalent

getDefaultProperties

public Properties getDefaultProperties()

Description copied from class: Dialect

Retrieve a set of default Hibernate properties for this database.

An implementation may set configuration properties from Dialect.initDefaultProperties(), though it is discouraged. the

Overrides:

getDefaultProperties in class Dialect

Returns:

the Hibernate configuration properties

See Also:

• Dialect.initDefaultProperties()

getDefaultStatementBatchSize

public int getDefaultStatementBatchSize()

Description copied from class: Dialect

The default value to use for the configuration property "hibernate.jdbc.batch_size".

Overrides:

getDefaultStatementBatchSize in class Dialect

getDefaultNonContextualLobCreation

public boolean getDefaultNonContextualLobCreation()

Description copied from class: Dialect

The default value to use for the configuration property "hibernate.jdbc.lob.non_contextual_creation".

Overrides:

getDefaultNonContextualLobCreation in class Dialect

getDefaultUseGetGeneratedKeys

public boolean getDefaultUseGetGeneratedKeys()

Description copied from class: Dialect

The default value to use for the configuration property "hibernate.jdbc.use_get_generated_keys".

Overrides:

getDefaultUseGetGeneratedKeys in class Dialect

toString

public String toString()

Overrides:

toString in class Dialect

contribute

public void contribute(TypeContributions typeContributions,
 ServiceRegistry serviceRegistry)

Description copied from interface: TypeContributor

Contribute types

Specified by:

contribute in interface TypeContributor

Overrides:

contribute in class Dialect

Parameters:

typeContributions - The callback for adding contributed types

serviceRegistry - The service registry

contributeTypes

public void contributeTypes(TypeContributions typeContributions,
 ServiceRegistry serviceRegistry)

Description copied from class: Dialect

A callback which allows the Dialect to contribute types.

Overrides:

contributeTypes in class Dialect

Parameters:

typeContributions - Callback to contribute the types

serviceRegistry - The service registry

getLobMergeStrategy

public LobMergeStrategy getLobMergeStrategy()

Description copied from class: Dialect

Get the LobMergeStrategy to use, Dialect.NEW_LOCATOR_LOB_MERGE_STRATEGY by default.

Overrides:

getLobMergeStrategy in class Dialect

getNativeIdentifierGeneratorStrategy

public String getNativeIdentifierGeneratorStrategy()

Description copied from class: Dialect

The name identifying the "native" id generation strategy for this dialect.

This is the name of the id generation strategy which should be used when "native" is specified in hbm.xml.

Overrides:

getNativeIdentifierGeneratorStrategy in class Dialect

Returns:

The name identifying the native generator strategy.

getIdentityColumnSupport

public IdentityColumnSupport getIdentityColumnSupport()

Description copied from class: Dialect

Get the appropriate IdentityColumnSupport for this dialect.

Overrides:

getIdentityColumnSupport in class Dialect

Returns:

the IdentityColumnSupport

getSequenceSupport

public SequenceSupport getSequenceSupport()

Description copied from class: Dialect

Get the appropriate SequenceSupport for this dialect.

Overrides:

getSequenceSupport in class Dialect

getQuerySequencesString

public String getQuerySequencesString()

Description copied from class: Dialect

Get the select command used retrieve the names of all sequences.

Overrides:

getQuerySequencesString in class Dialect

Returns:

The select command; or null if sequences are not supported.

getSequenceInformationExtractor

public SequenceInformationExtractor getSequenceInformationExtractor()

Description copied from class: Dialect

A SequenceInformationExtractor which is able to extract SequenceInformation from the JDBC result set returned when Dialect.getQuerySequencesString() is executed.

Overrides:

getSequenceInformationExtractor in class Dialect

getSelectGUIDString

public String getSelectGUIDString()

Description copied from class: Dialect

Get the command used to select a GUID from the database.

Optional operation.

Overrides:

getSelectGUIDString in class Dialect

Returns:

The appropriate command.

supportsTemporaryTables

public boolean supportsTemporaryTables()

Description copied from class: Dialect

Does this database have some sort of support for temporary tables?

Overrides:

supportsTemporaryTables in class Dialect

Returns:

true by default, since most do

supportsTemporaryTablePrimaryKey

public boolean supportsTemporaryTablePrimaryKey()

Description copied from class: Dialect

Does this database support primary keys for temporary tables?

Overrides:

supportsTemporaryTablePrimaryKey in class Dialect

Returns:

true by default, since most do

getLimitHandler

public LimitHandler getLimitHandler()

Description copied from class: Dialect

Obtain a LimitHandler that implements pagination support for Query.setMaxResults(int) and Query.setFirstResult(int).

Overrides:

getLimitHandler in class Dialect

supportsLockTimeouts

public boolean supportsLockTimeouts()

Description copied from class: Dialect

Does this dialect support specifying timeouts when requesting locks.

Overrides:

supportsLockTimeouts in class Dialect

Returns:

True is this dialect supports specifying lock timeouts.

getLockingStrategy

public LockingStrategy getLockingStrategy(EntityPersister lockable,
 LockMode lockMode)

Description copied from class: Dialect

A LockingStrategy which is able to acquire a database-level lock with the specified level.

Overrides:

getLockingStrategy in class Dialect

Parameters:

lockable - The persister for the entity to be locked.

lockMode - The type of lock to be acquired.

Returns:

The appropriate locking strategy.

getForUpdateString

public String getForUpdateString(LockOptions lockOptions)

Description copied from class: Dialect

Given a set of LockOptions (lock level, timeout), determine the appropriate for update fragment to use to obtain the lock.

Overrides:

getForUpdateString in class Dialect

Parameters:

lockOptions - contains the lock mode to apply.

Returns:

The appropriate for update fragment.

getForUpdateString

public String getForUpdateString(LockMode lockMode)

Description copied from class: Dialect

Given a LockMode, determine the appropriate for update fragment to use to obtain the lock.

Overrides:

getForUpdateString in class Dialect

Parameters:

lockMode - The lock mode to apply.

Returns:

The appropriate for update fragment.

getForUpdateString

public String getForUpdateString()

Description copied from class: Dialect

Get the string to append to SELECT statements to acquire pessimistic UPGRADE locks for this dialect.

Overrides:

getForUpdateString in class Dialect

Returns:

The appropriate FOR UPDATE clause string.

getWriteLockString

public String getWriteLockString(int timeout)

Description copied from class: Dialect

Get the string to append to SELECT statements to acquire pessimistic WRITE locks for this dialect.

Location of the returned string is treated the same as Dialect.getForUpdateString().

Overrides:

getWriteLockString in class Dialect

Parameters:

timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.

Returns:

The appropriate LOCK clause string.

getWriteLockString

public String getWriteLockString(String aliases,
 int timeout)

Description copied from class: Dialect

Get the string to append to SELECT statements to acquire WRITE locks for this dialect, given the aliases of the columns to be write locked.

Location of the returned string is treated the same as Dialect.getForUpdateString().

Overrides:

getWriteLockString in class Dialect

Parameters:

aliases - The columns to be read locked.

timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.

Returns:

The appropriate LOCK clause string.

getReadLockString

public String getReadLockString(int timeout)

Description copied from class: Dialect

Get the string to append to SELECT statements to acquire READ locks for this dialect.

Location of the returned string is treated the same as Dialect.getForUpdateString().

Overrides:

getReadLockString in class Dialect

Parameters:

timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.

Returns:

The appropriate LOCK clause string.

getReadLockString

public String getReadLockString(String aliases,
 int timeout)

Description copied from class: Dialect

Get the string to append to SELECT statements to acquire READ locks for this dialect, given the aliases of the columns to be read locked.

Location of the returned string is treated the same as Dialect.getForUpdateString().

Overrides:

getReadLockString in class Dialect

Parameters:

aliases - The columns to be read locked.

timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.

Returns:

The appropriate LOCK clause string.

getWriteRowLockStrategy

public RowLockStrategy getWriteRowLockStrategy()

Description copied from class: Dialect

The row lock strategy to use for write locks.

Overrides:

getWriteRowLockStrategy in class Dialect

getReadRowLockStrategy

public RowLockStrategy getReadRowLockStrategy()

Description copied from class: Dialect

The row lock strategy to use for read locks.

Overrides:

getReadRowLockStrategy in class Dialect

supportsOuterJoinForUpdate

public boolean supportsOuterJoinForUpdate()

Description copied from class: Dialect

Does this dialect support FOR UPDATE in conjunction with outer-joined rows?

Overrides:

supportsOuterJoinForUpdate in class Dialect

Returns:

True if outer-joined rows can be locked via FOR UPDATE.

getForUpdateString

public String getForUpdateString(String aliases)

Description copied from class: Dialect

Get the FOR UPDATE OF column_list fragment appropriate for this dialect, given the aliases of the columns to be write locked.

Overrides:

getForUpdateString in class Dialect

Parameters:

aliases - The columns to be write locked.

Returns:

The appropriate FOR UPDATE OF column_list clause string.

getForUpdateString

public String getForUpdateString(String aliases,
 LockOptions lockOptions)

Description copied from class: Dialect

Get the FOR UPDATE OF or FOR SHARE OF fragment appropriate for this dialect, given the aliases of the columns to be locked.

Overrides:

getForUpdateString in class Dialect

Parameters:

aliases - The columns to be locked.

lockOptions - the lock options to apply

Returns:

The appropriate FOR UPDATE OF column_list clause string.

getForUpdateNowaitString

public String getForUpdateNowaitString()

Description copied from class: Dialect

Retrieves the FOR UPDATE NOWAIT syntax specific to this dialect.

Overrides:

getForUpdateNowaitString in class Dialect

Returns:

The appropriate FOR UPDATE NOWAIT clause string.

getForUpdateSkipLockedString

public String getForUpdateSkipLockedString()

Description copied from class: Dialect

Retrieves the FOR UPDATE SKIP LOCKED syntax specific to this dialect.

Overrides:

getForUpdateSkipLockedString in class Dialect

Returns:

The appropriate FOR UPDATE SKIP LOCKED clause string.

getForUpdateNowaitString

public String getForUpdateNowaitString(String aliases)

Description copied from class: Dialect

Get the FOR UPDATE OF column_list NOWAIT fragment appropriate for this dialect, given the aliases of the columns to be write locked.

Overrides:

getForUpdateNowaitString in class Dialect

Parameters:

aliases - The columns to be write locked.

Returns:

The appropriate FOR UPDATE OF colunm_list NOWAIT clause string.

getForUpdateSkipLockedString

public String getForUpdateSkipLockedString(String aliases)

Description copied from class: Dialect

Get the FOR UPDATE OF column_list SKIP LOCKED fragment appropriate for this dialect, given the aliases of the columns to be write locked.

Overrides:

getForUpdateSkipLockedString in class Dialect

Parameters:

aliases - The columns to be write locked.

Returns:

The appropriate FOR UPDATE colunm_list SKIP LOCKED clause string.

appendLockHint

public String appendLockHint(LockOptions lockOptions,
 String tableName)

Description copied from class: Dialect

Some dialects support an alternative means to SELECT FOR UPDATE, whereby a "lock hint" is appended to the table name in the from clause.

Overrides:

appendLockHint in class Dialect

Parameters:

lockOptions - The lock options to apply

tableName - The name of the table to which to apply the lock hint.

Returns:

The table with any required lock hints.

applyLocksToSql

public String applyLocksToSql(String sql,
 LockOptions aliasedLockOptions,
 Map<String,String[]> keyColumnNames)

Description copied from class: Dialect

Modifies the given SQL, applying the appropriate updates for the specified lock modes and key columns.

This allows emulation of SELECT FOR UPDATE for dialects which do not support the standard syntax.

Overrides:

applyLocksToSql in class Dialect

Parameters:

sql - the SQL string to modify

aliasedLockOptions - lock options indexed by aliased table names.

keyColumnNames - a map of key columns indexed by aliased table names.

Returns:

the modified SQL string.

getCreateTableString

public String getCreateTableString()

Description copied from class: Dialect

The command used to create a table, usually create table.

Overrides:

getCreateTableString in class Dialect

Returns:

The command used to create a table.

getTableTypeString

public String getTableTypeString()

Description copied from class: Dialect

An arbitrary fragment appended to the end of the create table statement.

Overrides:

getTableTypeString in class Dialect

supportsIfExistsBeforeTableName

public boolean supportsIfExistsBeforeTableName()

Description copied from class: Dialect

For dropping a table, can the phrase if exists be applied before the table name?

Overrides:

supportsIfExistsBeforeTableName in class Dialect

Returns:

true if if exists can be applied before the table name

supportsIfExistsAfterTableName

public boolean supportsIfExistsAfterTableName()

Description copied from class: Dialect

For dropping a table, can the phrase if exists be applied after the table name?

Overrides:

supportsIfExistsAfterTableName in class Dialect

Returns:

true if if exists can be applied after the table name

getDropTableString

public String getDropTableString(String tableName)

Description copied from class: Dialect

The command used to drop a table with the given name, usually drop table tab_name.

Overrides:

getDropTableString in class Dialect

Parameters:

tableName - The name of the table to drop

Returns:

The drop table statement as a string

See Also:

• StandardTableExporter.getSqlDropStrings(org.hibernate.mapping.Table, org.hibernate.boot.Metadata, org.hibernate.boot.model.relational.SqlStringGenerationContext)

getCreateIndexString

public String getCreateIndexString(boolean unique)

Description copied from class: Dialect

The command used to create an index, usually create index or create unique index.

Overrides:

getCreateIndexString in class Dialect

Parameters:

unique - true if the index is a unique index

Returns:

The command used to create an index.

getCreateIndexTail

public String getCreateIndexTail(boolean unique,
 List<Column> columns)

Description copied from class: Dialect

A string to be appended to the end of the create index command, usually to specify that null values are to be considered distinct.

Overrides:

getCreateIndexTail in class Dialect

qualifyIndexName

public boolean qualifyIndexName()

Description copied from class: Dialect

Do we need to qualify index names with the schema name?

Overrides:

qualifyIndexName in class Dialect

Returns:

true if we do

getCreateMultisetTableString

public String getCreateMultisetTableString()

Description copied from class: Dialect

Slight variation on Dialect.getCreateTableString(). Here, we have the command used to create a table when there is no primary key and duplicate rows are expected.

Overrides:

getCreateMultisetTableString in class Dialect

Returns:

The command used to create a multiset table.

hasAlterTable

public boolean hasAlterTable()

Description copied from class: Dialect

Does this dialect support the ALTER TABLE syntax?

Overrides:

hasAlterTable in class Dialect

Returns:

True if we support altering existing tables; false otherwise.

getAlterTableString

public String getAlterTableString(String tableName)

Description copied from class: Dialect

The command used to alter a table with the given name, usually alter table tab_name or alter table tab_name if exists.

We prefer the if exists form if supported.

Overrides:

getAlterTableString in class Dialect

Parameters:

tableName - The name of the table to alter

Returns:

The command used to alter a table.

supportsIfExistsAfterAlterTable

public boolean supportsIfExistsAfterAlterTable()

Description copied from class: Dialect

For an alter table, can the phrase if exists be applied?

Overrides:

supportsIfExistsAfterAlterTable in class Dialect

Returns:

true if if exists can be applied after alter table

getAddColumnString

public String getAddColumnString()

Description copied from class: Dialect

The subcommand of the alter table command used to add a column to a table, usually add column or add.

Overrides:

getAddColumnString in class Dialect

Returns:

The add column fragment.

getAddColumnSuffixString

public String getAddColumnSuffixString()

Description copied from class: Dialect

The syntax for the suffix used to add a column to a table.

Overrides:

getAddColumnSuffixString in class Dialect

Returns:

The suffix of the add column fragment.

dropConstraints

public boolean dropConstraints()

Description copied from class: Dialect

Do we need to drop constraints before dropping tables in this dialect?

Overrides:

dropConstraints in class Dialect

Returns:

True if constraints must be dropped prior to dropping the table; false otherwise.

getDropForeignKeyString

public String getDropForeignKeyString()

Description copied from class: Dialect

The subcommand of the alter table command used to drop a foreign key constraint, usually drop constraint.

Overrides:

getDropForeignKeyString in class Dialect

getDropUniqueKeyString

public String getDropUniqueKeyString()

Description copied from class: Dialect

The subcommand of the alter table command used to drop a unique key constraint.

Overrides:

getDropUniqueKeyString in class Dialect

supportsIfExistsBeforeConstraintName

public boolean supportsIfExistsBeforeConstraintName()

Description copied from class: Dialect

For dropping a constraint with an alter table statement, can the phrase if exists be applied before the constraint name?

Overrides:

supportsIfExistsBeforeConstraintName in class Dialect

Returns:

true if if exists can be applied before the constraint name

supportsIfExistsAfterConstraintName

public boolean supportsIfExistsAfterConstraintName()

Description copied from class: Dialect

For dropping a constraint with an alter table, can the phrase if exists be applied after the constraint name?

Overrides:

supportsIfExistsAfterConstraintName in class Dialect

Returns:

true if if exists can be applied after the constraint name

supportsAlterColumnType

public boolean supportsAlterColumnType()

Description copied from class: Dialect

Does this dialect support modifying the type of an existing column?

Overrides:

supportsAlterColumnType in class Dialect

getAlterColumnTypeString

public String getAlterColumnTypeString(String columnName,
 String columnType,
 String columnDefinition)

Description copied from class: Dialect

The fragment of an alter table command which modifies a column type, or null if column types cannot be modified. Often alter column col_name set data type col_type.

Overrides:

getAlterColumnTypeString in class Dialect

Parameters:

columnName - the name of the column

columnType - the new type of the column

columnDefinition - the full column definition

Returns:

a fragment to be appended to alter table

getAddForeignKeyConstraintString

public String getAddForeignKeyConstraintString(String constraintName,
 String[] foreignKey,
 String referencedTable,
 String[] primaryKey,
 boolean referencesPrimaryKey)

Description copied from class: Dialect

The syntax used to add a foreign key constraint to a table, with the referenced key columns explicitly specified.

Overrides:

getAddForeignKeyConstraintString in class Dialect

Parameters:

constraintName - The foreign key constraint name

foreignKey - The names of the columns comprising the foreign key

referencedTable - The table referenced by the foreign key

primaryKey - The explicit columns in the referencedTable referenced by this foreign key.

referencesPrimaryKey - if false, constraint should be explicit about which column names the constraint refers to

Returns:

the "add FK" fragment

getAddForeignKeyConstraintString

public String getAddForeignKeyConstraintString(String constraintName,
 String foreignKeyDefinition)

Description copied from class: Dialect

The syntax used to add a foreign key constraint to a table, given the definition of the foreign key as a string.

Overrides:

getAddForeignKeyConstraintString in class Dialect

Parameters:

constraintName - The foreign key constraint name

foreignKeyDefinition - The whole definition of the foreign key as a fragment

getAddPrimaryKeyConstraintString

public String getAddPrimaryKeyConstraintString(String constraintName)

Description copied from class: Dialect

The syntax used to add a primary key constraint to a table.

Overrides:

getAddPrimaryKeyConstraintString in class Dialect

Parameters:

constraintName - The name of the PK constraint.

Returns:

The "add PK" fragment

getFallbackSqmMutationStrategy

public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(EntityMappingType entityDescriptor,
 RuntimeModelCreationContext runtimeModelCreationContext)

Description copied from class: Dialect

The SqmMultiTableMutationStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableMutationStrategy().

Overrides:

getFallbackSqmMutationStrategy in class Dialect

See Also:

• SqmMultiTableMutationStrategyProvider.createMutationStrategy(org.hibernate.metamodel.mapping.EntityMappingType, org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess)

getFallbackSqmInsertStrategy

public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(EntityMappingType entityDescriptor,
 RuntimeModelCreationContext runtimeModelCreationContext)

Description copied from class: Dialect

The SqmMultiTableInsertStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableInsertStrategy().

Overrides:

getFallbackSqmInsertStrategy in class Dialect

See Also:

• SqmMultiTableMutationStrategyProvider.createInsertStrategy(org.hibernate.metamodel.mapping.EntityMappingType, org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess)

getCreateUserDefinedTypeKindString

public String getCreateUserDefinedTypeKindString()

Description copied from class: Dialect

The kind of user-defined type to create, or the empty string if this does not need to be specified. Included after create type type_name as, but before the list of members.

Overrides:

getCreateUserDefinedTypeKindString in class Dialect

getCreateUserDefinedTypeExtensionsString

public String getCreateUserDefinedTypeExtensionsString()

Description copied from class: Dialect

An arbitrary extension to append to the end of the UDT create type command.

Overrides:

getCreateUserDefinedTypeExtensionsString in class Dialect

supportsIfExistsBeforeTypeName

public boolean supportsIfExistsBeforeTypeName()

Description copied from class: Dialect

For dropping a type, can the phrase if exists be applied before the type name?

Overrides:

supportsIfExistsBeforeTypeName in class Dialect

Returns:

true if if exists can be applied before the type name

supportsIfExistsAfterTypeName

public boolean supportsIfExistsAfterTypeName()

Description copied from class: Dialect

For dropping a type, can the phrase if exists be applied after the type name?

Overrides:

supportsIfExistsAfterTypeName in class Dialect

Returns:

true if if exists can be applied after the type name

registerResultSetOutParameter

public int registerResultSetOutParameter(CallableStatement statement,
 int position)
                                  throws SQLException

Description copied from class: Dialect

Registers a parameter capable of returning a ResultSet by position, either an OUT parameter, or a REF_CURSOR parameter as defined in Java 8.

Overrides:

registerResultSetOutParameter in class Dialect

Parameters:

statement - The callable statement.

position - The bind position at which to register the output param.

Returns:

The number of (contiguous) bind positions used.

Throws:

SQLException - Indicates problems registering the param.

registerResultSetOutParameter

public int registerResultSetOutParameter(CallableStatement statement,
 String name)
                                  throws SQLException

Description copied from class: Dialect

Registers a parameter capable of returning a ResultSet by name, either an OUT parameter, or a REF_CURSOR parameter as defined in Java 8.

Overrides:

registerResultSetOutParameter in class Dialect

Parameters:

statement - The callable statement.

name - The parameter name (for drivers which support named parameters).

Returns:

The number of (contiguous) bind positions used.

Throws:

SQLException - Indicates problems registering the param.

getResultSet

public ResultSet getResultSet(CallableStatement statement)
                       throws SQLException

Description copied from class: Dialect

Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the OUT parameter.

Overrides:

getResultSet in class Dialect

Parameters:

statement - The callable statement.

Returns:

The extracted result set.

Throws:

SQLException - Indicates problems extracting the result set.

getResultSet

public ResultSet getResultSet(CallableStatement statement,
 int position)
                       throws SQLException

Description copied from class: Dialect

Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the positional OUT parameter.

Overrides:

getResultSet in class Dialect

Parameters:

statement - The callable statement.

position - The bind position at which to register the output param.

Returns:

The extracted result set.

Throws:

SQLException - Indicates problems extracting the result set.

getResultSet

public ResultSet getResultSet(CallableStatement statement,
 String name)
                       throws SQLException

Description copied from class: Dialect

Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the named OUT parameter.

Overrides:

getResultSet in class Dialect

Parameters:

statement - The callable statement.

name - The parameter name (for drivers which support named parameters).

Returns:

The extracted result set.

Throws:

SQLException - Indicates problems extracting the result set.

supportsCurrentTimestampSelection

public boolean supportsCurrentTimestampSelection()

Description copied from class: Dialect

Does this dialect support some way to retrieve the current timestamp value from the database?

Overrides:

supportsCurrentTimestampSelection in class Dialect

Returns:

True if the current timestamp can be retrieved; false otherwise.

isCurrentTimestampSelectStringCallable

public boolean isCurrentTimestampSelectStringCallable()

Description copied from class: Dialect

Is the command returned by Dialect.getCurrentTimestampSelectString() treated as callable?

Typically, this indicates the use of the JDBC escape syntax.

Overrides:

isCurrentTimestampSelectStringCallable in class Dialect

Returns:

if the Dialect.getCurrentTimestampSelectString() is treated as callable; false otherwise.

getCurrentTimestampSelectString

public String getCurrentTimestampSelectString()

Description copied from class: Dialect

The command used to retrieve the current timestamp from the database.

Overrides:

getCurrentTimestampSelectString in class Dialect

supportsStandardCurrentTimestampFunction

public boolean supportsStandardCurrentTimestampFunction()

Description copied from class: Dialect

Does this dialect have an ANSI SQL current_timestamp function?

Overrides:

supportsStandardCurrentTimestampFunction in class Dialect

buildSQLExceptionConversionDelegate

public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate()

Description copied from class: Dialect

An instance of SQLExceptionConversionDelegate for interpreting dialect-specific error or SQLState codes.

If this method is overridden to return a non-null value, the default SQLExceptionConverter will use the returned SQLExceptionConversionDelegate in addition to the following standard delegates:

1. a "static" delegate based on the JDBC4-defined SQLException hierarchy, and
2. a delegate that interprets SQLState codes as either X/Open or SQL-2003 codes, depending on what is reported by the JDBC driver.

It is strongly recommended that every Dialect implementation override this method, since interpretation of a SQL error is much more accurate when based on the vendor-specific error code, rather than on the SQLState.

Overrides:

buildSQLExceptionConversionDelegate in class Dialect

Returns:

The SQLExceptionConversionDelegate for this dialect

getViolatedConstraintNameExtractor

public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor()

Description copied from class: Dialect

A ViolatedConstraintNameExtractor for extracting the name of a violated constraint from a SQLException.

Specified by:

getViolatedConstraintNameExtractor in interface ConversionContext

Overrides:

getViolatedConstraintNameExtractor in class Dialect

getSelectClauseNullString

public String getSelectClauseNullString(int sqlType,
 TypeConfiguration typeConfiguration)

Description copied from class: Dialect

Given a JDBC type code, return the expression for a literal null value of that type, to use in a select clause.

The select query will be an element of a UNION or UNION ALL.

Overrides:

getSelectClauseNullString in class Dialect

Parameters:

sqlType - The Types type code.

typeConfiguration - The type configuration

Returns:

The appropriate select clause value fragment.

supportsUnionAll

public boolean supportsUnionAll()

Description copied from class: Dialect

Does this dialect support UNION ALL?

Overrides:

supportsUnionAll in class Dialect

Returns:

True if UNION ALL is supported; false otherwise.

supportsUnionInSubquery

public boolean supportsUnionInSubquery()

Description copied from class: Dialect

Does this dialect support UNION in a subquery.

Overrides:

supportsUnionInSubquery in class Dialect

Returns:

True if UNION is supported in a subquery; false otherwise.

getNoColumnsInsertString

@Deprecated(since="6")
public String getNoColumnsInsertString()

Deprecated.

Description copied from class: Dialect

The fragment used to insert a row without specifying any column values, usually just (), but sometimes default values.

Overrides:

getNoColumnsInsertString in class Dialect

Returns:

The appropriate empty values clause.

supportsNoColumnsInsert

public boolean supportsNoColumnsInsert()

Description copied from class: Dialect

Is the INSERT statement is allowed to contain no columns?

Overrides:

supportsNoColumnsInsert in class Dialect

Returns:

if this dialect supports no-column INSERT.

getLowercaseFunction

public String getLowercaseFunction()

Description copied from class: Dialect

The name of the SQL function that transforms a string to lowercase, almost always lower.

Overrides:

getLowercaseFunction in class Dialect

Returns:

The dialect-specific lowercase function.

getCaseInsensitiveLike

public String getCaseInsensitiveLike()

Description copied from class: Dialect

The name of the SQL operator that performs case-insensitive LIKE comparisons.

Overrides:

getCaseInsensitiveLike in class Dialect

Returns:

The dialect-specific case-insensitive like operator.

supportsCaseInsensitiveLike

public boolean supportsCaseInsensitiveLike()

Description copied from class: Dialect

Does this dialect support case-insensitive LIKE comparisons?

Overrides:

supportsCaseInsensitiveLike in class Dialect

Returns:

true if the database supports case-insensitive like comparisons, false otherwise. The default is false.

supportsTruncateWithCast

public boolean supportsTruncateWithCast()

Description copied from class: Dialect

Does this dialect support truncation of values to a specified length via a cast?

Overrides:

supportsTruncateWithCast in class Dialect

Returns:

true if the database supports truncation via a cast, false otherwise. The default is true.

transformSelectString

public String transformSelectString(String select)

Description copied from class: Dialect

Meant as a means for end users to affect the select strings being sent to the database and perhaps manipulate them in some fashion.

Overrides:

transformSelectString in class Dialect

Parameters:

select - The select command

Returns:

The mutated select command, or the same as was passed in.

getMaxAliasLength

public int getMaxAliasLength()

Description copied from class: Dialect

What is the maximum length Hibernate can use for generated aliases?

Overrides:

getMaxAliasLength in class Dialect

Returns:

The maximum length.

getMaxIdentifierLength

public int getMaxIdentifierLength()

Description copied from class: Dialect

What is the maximum identifier length supported by this dialect?

Overrides:

getMaxIdentifierLength in class Dialect

Returns:

The maximum length.

toBooleanValueString

public String toBooleanValueString(boolean bool)

Description copied from class: Dialect

The SQL literal expression representing the given boolean value.

Overrides:

toBooleanValueString in class Dialect

Parameters:

bool - The boolean value

Returns:

The appropriate SQL literal.

appendBooleanValueString

public void appendBooleanValueString(SqlAppender appender,
 boolean bool)

Description copied from class: Dialect

Append the SQL literal expression representing the given boolean value to the given SqlAppender.

Overrides:

appendBooleanValueString in class Dialect

Parameters:

appender - The SqlAppender to append the literal expression to

bool - The boolean value

registerKeyword

public void registerKeyword(String word)

Description copied from class: Dialect

Register a keyword.

Overrides:

registerKeyword in class Dialect

Parameters:

word - a reserved word in this SQL dialect

getKeywords

public Set<String> getKeywords()

Description copied from class: Dialect

The keywords of this SQL dialect.

Overrides:

getKeywords in class Dialect

buildIdentifierHelper

public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder,
 DatabaseMetaData dbMetaData)
                                       throws SQLException

Description copied from class: Dialect

The IdentifierHelper indicated by this dialect for handling identifier conversions. Returning null is allowed and indicates that Hibernate should fall back to building a "standard" helper. In the fallback path, any changes made to the IdentifierHelperBuilder during this call will still be incorporated into the built IdentifierHelper.

The incoming builder will have the following set:

• IdentifierHelperBuilder.isGloballyQuoteIdentifiers()
• IdentifierHelperBuilder.getUnquotedCaseStrategy() - initialized to UPPER
• IdentifierHelperBuilder.getQuotedCaseStrategy() - initialized to MIXED

By default, Hibernate will do the following:

• Call IdentifierHelperBuilder.applyIdentifierCasing(DatabaseMetaData)
• Call IdentifierHelperBuilder.applyReservedWords(DatabaseMetaData)
• Applies AnsiSqlKeywords.sql2003() as reserved words
• Applies the {#link #sqlKeywords} collected here as reserved words
• Applies the Dialect's NameQualifierSupport, if it defines one

Overrides:

buildIdentifierHelper in class Dialect

Parameters:

builder - A partially-configured IdentifierHelperBuilder.

dbMetaData - Access to the metadata returned from the driver if needed and if available. WARNING: it may be null.

Returns:

The IdentifierHelper instance to use, or null to indicate Hibernate should use its fallback path

Throws:

SQLException - Accessing the DatabaseMetaData can throw it. Just rethrow and Hibernate will handle it.

See Also:

• Dialect.getNameQualifierSupport()

openQuote

public char openQuote()

Description copied from class: Dialect

The character specific to this dialect used to begin a quoted identifier.

Overrides:

openQuote in class Dialect

Returns:

The dialect-specific open quote character.

closeQuote

public char closeQuote()

Description copied from class: Dialect

The character specific to this dialect used to close a quoted identifier.

Overrides:

closeQuote in class Dialect

Returns:

The dialect-specific close quote character.

toQuotedIdentifier

public String toQuotedIdentifier(String name)

Description copied from class: Dialect

Apply dialect-specific quoting.

Overrides:

toQuotedIdentifier in class Dialect

Parameters:

name - The value to be quoted.

Returns:

The quoted value.

See Also:

• Dialect.openQuote()
• Dialect.closeQuote()

quote

public String quote(String name)

Description copied from class: Dialect

Apply dialect-specific quoting if the given name is quoted using backticks.

By default, the incoming name is checked to see if its first character is a backtick (`). If it is, the dialect specific quoting is applied.

Overrides:

quote in class Dialect

Parameters:

name - The value to be quoted.

Returns:

The quoted (or unmodified, if not starting with backtick) value.

See Also:

• Dialect.openQuote()
• Dialect.closeQuote()

getFallbackSchemaManagementTool

@Incubating
public SchemaManagementTool getFallbackSchemaManagementTool(Map<String,Object> configurationValues,
 ServiceRegistryImplementor registry)

Description copied from class: Dialect

The SchemaManagementTool to use if none is explicitly specified.

Overrides:

getFallbackSchemaManagementTool in class Dialect

Returns:

a HibernateSchemaManagementTool by default

getTableExporter

public Exporter<Table> getTableExporter()

Description copied from class: Dialect

Get an Exporter for Tables, usually StandardTableExporter.

Overrides:

getTableExporter in class Dialect

getTableMigrator

public TableMigrator getTableMigrator()

Description copied from class: Dialect

Get a TableMigrator, usually StandardTableMigrator.

Overrides:

getTableMigrator in class Dialect

getTableCleaner

public Cleaner getTableCleaner()

Description copied from class: Dialect

Get a schema Cleaner, usually StandardTableCleaner.

Overrides:

getTableCleaner in class Dialect

getUserDefinedTypeExporter

public Exporter<UserDefinedType> getUserDefinedTypeExporter()

Description copied from class: Dialect

Get an Exporter for UserDefinedTypes, usually StandardUserDefinedTypeExporter.

Overrides:

getUserDefinedTypeExporter in class Dialect

getSequenceExporter

public Exporter<Sequence> getSequenceExporter()

Description copied from class: Dialect

Get an Exporter for Sequences, usually StandardSequenceExporter.

Overrides:

getSequenceExporter in class Dialect

getIndexExporter

public Exporter<Index> getIndexExporter()

Description copied from class: Dialect

Get an Exporter for Indexes, usually StandardIndexExporter.

Overrides:

getIndexExporter in class Dialect

getForeignKeyExporter

public Exporter<ForeignKey> getForeignKeyExporter()

Description copied from class: Dialect

Get an Exporter for ForeignKeys, usually StandardForeignKeyExporter.

Overrides:

getForeignKeyExporter in class Dialect

getUniqueKeyExporter

public Exporter<Constraint> getUniqueKeyExporter()

Description copied from class: Dialect

Get an Exporter for unique key Constraints, usually StandardUniqueKeyExporter.

Overrides:

getUniqueKeyExporter in class Dialect

getAuxiliaryDatabaseObjectExporter

public Exporter<AuxiliaryDatabaseObject> getAuxiliaryDatabaseObjectExporter()

Description copied from class: Dialect

Get an Exporter for AuxiliaryDatabaseObjects, usually StandardAuxiliaryDatabaseObjectExporter.

Overrides:

getAuxiliaryDatabaseObjectExporter in class Dialect

getTemporaryTableExporter

public TemporaryTableExporter getTemporaryTableExporter()

Description copied from class: Dialect

Get a TemporaryTableExporter, usually StandardTemporaryTableExporter.

Overrides:

getTemporaryTableExporter in class Dialect

getSupportedTemporaryTableKind

public TemporaryTableKind getSupportedTemporaryTableKind()

Description copied from class: Dialect

The kind of temporary tables that are supported on this database.

Overrides:

getSupportedTemporaryTableKind in class Dialect

getTemporaryTableCreateOptions

public String getTemporaryTableCreateOptions()

Description copied from class: Dialect

An arbitrary SQL fragment appended to the end of the statement to create a temporary table, specifying dialect-specific options, or null if there are no options to specify.

Overrides:

getTemporaryTableCreateOptions in class Dialect

getTemporaryTableCreateCommand

public String getTemporaryTableCreateCommand()

Description copied from class: Dialect

The command to create a temporary table.

Overrides:

getTemporaryTableCreateCommand in class Dialect

getTemporaryTableDropCommand

public String getTemporaryTableDropCommand()

Description copied from class: Dialect

The command to drop a temporary table.

Overrides:

getTemporaryTableDropCommand in class Dialect

getTemporaryTableTruncateCommand

public String getTemporaryTableTruncateCommand()

Description copied from class: Dialect

The command to truncate a temporary table.

Overrides:

getTemporaryTableTruncateCommand in class Dialect

getCreateTemporaryTableColumnAnnotation

public String getCreateTemporaryTableColumnAnnotation(int sqlTypeCode)

Description copied from class: Dialect

Annotation to be appended to the end of each COLUMN clause for temporary tables.

Overrides:

getCreateTemporaryTableColumnAnnotation in class Dialect

Parameters:

sqlTypeCode - The SQL type code

Returns:

The annotation to be appended, for example, COLLATE DATABASE_DEFAULT in SQL Server

getTemporaryTableDdlTransactionHandling

public TempTableDdlTransactionHandling getTemporaryTableDdlTransactionHandling()

Description copied from class: Dialect

The sort of transaction handling to use when creating or dropping temporary tables.

Overrides:

getTemporaryTableDdlTransactionHandling in class Dialect

getTemporaryTableAfterUseAction

public AfterUseAction getTemporaryTableAfterUseAction()

Description copied from class: Dialect

The action to take after finishing use of a temporary table.

Overrides:

getTemporaryTableAfterUseAction in class Dialect

getTemporaryTableBeforeUseAction

public BeforeUseAction getTemporaryTableBeforeUseAction()

Description copied from class: Dialect

The action to take before beginning use of a temporary table.

Overrides:

getTemporaryTableBeforeUseAction in class Dialect

canCreateCatalog

public boolean canCreateCatalog()

Description copied from class: Dialect

Does this dialect support creating and dropping catalogs?

Overrides:

canCreateCatalog in class Dialect

Returns:

True if the dialect supports catalog creation; false otherwise.

getCreateCatalogCommand

public String[] getCreateCatalogCommand(String catalogName)

Description copied from class: Dialect

Get the SQL command used to create the named catalog.

Overrides:

getCreateCatalogCommand in class Dialect

Parameters:

catalogName - The name of the catalog to be created.

Returns:

The creation commands

getDropCatalogCommand

public String[] getDropCatalogCommand(String catalogName)

Description copied from class: Dialect

Get the SQL command used to drop the named catalog.

Overrides:

getDropCatalogCommand in class Dialect

Parameters:

catalogName - The name of the catalog to be dropped.

Returns:

The drop commands

canCreateSchema

public boolean canCreateSchema()

Description copied from class: Dialect

Does this dialect support creating and dropping schema?

Overrides:

canCreateSchema in class Dialect

Returns:

True if the dialect supports schema creation; false otherwise.

getCreateSchemaCommand

public String[] getCreateSchemaCommand(String schemaName)

Description copied from class: Dialect

Get the SQL command used to create the named schema.

Overrides:

getCreateSchemaCommand in class Dialect

Parameters:

schemaName - The name of the schema to be created.

Returns:

The creation commands

getDropSchemaCommand

public String[] getDropSchemaCommand(String schemaName)

Description copied from class: Dialect

Get the SQL command used to drop the named schema.

Overrides:

getDropSchemaCommand in class Dialect

Parameters:

schemaName - The name of the schema to be dropped.

Returns:

The drop commands

getCurrentSchemaCommand

public String getCurrentSchemaCommand()

Description copied from class: Dialect

Get the SQL command used to retrieve the current schema name.

Works in conjunction with Dialect.getSchemaNameResolver(), unless the resulting SchemaNameResolver does not need this information. For example, a custom implementation might make use of the Java 1.7 Connection.getSchema() method.

Overrides:

getCurrentSchemaCommand in class Dialect

Returns:

The current schema retrieval SQL

getSchemaNameResolver

public SchemaNameResolver getSchemaNameResolver()

Description copied from class: Dialect

Get the strategy for determining the schema name from a JDBC Connection, usually DefaultSchemaNameResolver.

Overrides:

getSchemaNameResolver in class Dialect

Returns:

The schema name resolver strategy

hasSelfReferentialForeignKeyBug

public boolean hasSelfReferentialForeignKeyBug()

Description copied from class: Dialect

Does the database/driver have bug in deleting rows that refer to other rows being deleted in the same query?

Overrides:

hasSelfReferentialForeignKeyBug in class Dialect

Returns:

true if the database/driver has this bug

getNullColumnString

public String getNullColumnString()

Description copied from class: Dialect

The keyword used to specify a nullable column, usually "", but sometimes " null".

Overrides:

getNullColumnString in class Dialect

getNullColumnString

public String getNullColumnString(String columnType)

Description copied from class: Dialect

The keyword used to specify a nullable column of the given SQL type.

Overrides:

getNullColumnString in class Dialect

supportsCommentOn

public boolean supportsCommentOn()

Description copied from class: Dialect

Does this dialect support commenting on tables and columns?

Overrides:

supportsCommentOn in class Dialect

Returns:

true if commenting is supported

getTableComment

public String getTableComment(String comment)

Description copied from class: Dialect

Get the comment into a form supported for table definition.

Overrides:

getTableComment in class Dialect

Parameters:

comment - The comment to apply

Returns:

The comment fragment

getUserDefinedTypeComment

public String getUserDefinedTypeComment(String comment)

Description copied from class: Dialect

Get the comment into a form supported for UDT definition.

Overrides:

getUserDefinedTypeComment in class Dialect

Parameters:

comment - The comment to apply

Returns:

The comment fragment

getColumnComment

public String getColumnComment(String comment)

Description copied from class: Dialect

Get the comment into a form supported for column definition.

Overrides:

getColumnComment in class Dialect

Parameters:

comment - The comment to apply

Returns:

The comment fragment

supportsColumnCheck

public boolean supportsColumnCheck()

Description copied from class: Dialect

Does this dialect support column-level check constraints?

Overrides:

supportsColumnCheck in class Dialect

Returns:

True if column-level check constraints are supported; false otherwise.

supportsTableCheck

public boolean supportsTableCheck()

Description copied from class: Dialect

Does this dialect support table-level check constraints?

Overrides:

supportsTableCheck in class Dialect

Returns:

True if table-level check constraints are supported; false otherwise.

supportsCascadeDelete

public boolean supportsCascadeDelete()

Description copied from class: Dialect

Does this dialect support on delete actions in foreign key definitions?

Overrides:

supportsCascadeDelete in class Dialect

Returns:

true if the dialect does support the on delete clause.

getCascadeConstraintsString

public String getCascadeConstraintsString()

Description copied from class: Dialect

The keyword that specifies that a drop table operation should be cascaded to its constraints, typically " cascade" where the leading space is required, or the empty string if there is no such keyword in this dialect.

Overrides:

getCascadeConstraintsString in class Dialect

Returns:

The cascade drop keyword, if any, with a leading space

getColumnAliasExtractor

public ColumnAliasExtractor getColumnAliasExtractor()

Description copied from class: Dialect

A ColumnAliasExtractor, usually just ResultSetMetaData.getColumnLabel(int).

Overrides:

getColumnAliasExtractor in class Dialect

useInputStreamToInsertBlob

public boolean useInputStreamToInsertBlob()

Description copied from class: Dialect

Should LOBs (both BLOB and CLOB) be bound using stream operations, that is, using PreparedStatement.setBinaryStream(int, java.io.InputStream, int)).

Overrides:

useInputStreamToInsertBlob in class Dialect

Returns:

True if BLOBs and CLOBs should be bound using stream operations.

useConnectionToCreateLob

public boolean useConnectionToCreateLob()

Description copied from class: Dialect

Should BLOB, CLOB, and NCLOB be created solely using respectively Connection.createBlob(), Connection.createClob(), and Connection.createNClob().

Overrides:

useConnectionToCreateLob in class Dialect

Returns:

True if BLOB, CLOB, and NCLOB should be created using JDBC Connection.

supportsOrdinalSelectItemReference

public boolean supportsOrdinalSelectItemReference()

Description copied from class: Dialect

Does this dialect support references to result variables (i.e, select items) by column positions (1-origin) as defined by the select clause?

Overrides:

supportsOrdinalSelectItemReference in class Dialect

Returns:

true if result variable references by column positions are supported; false otherwise.

getNullOrdering

public NullOrdering getNullOrdering()

Description copied from class: Dialect

Returns the default ordering of null.

Overrides:

getNullOrdering in class Dialect

supportsNullPrecedence

public boolean supportsNullPrecedence()

Description copied from class: Dialect

Does this dialect support nulls first and nulls last?

Overrides:

supportsNullPrecedence in class Dialect

isAnsiNullOn

@Deprecated(since="6")
public boolean isAnsiNullOn()

Deprecated.

Description copied from class: Dialect

A setting specific to SybaseASEDialect.

Overrides:

isAnsiNullOn in class Dialect

requiresCastForConcatenatingNonStrings

public boolean requiresCastForConcatenatingNonStrings()

Description copied from class: Dialect

Does this dialect/database require casting of non-string arguments in the concat() function?

Overrides:

requiresCastForConcatenatingNonStrings in class Dialect

Returns:

true if casting using cast() is required

requiresFloatCastingOfIntegerDivision

public boolean requiresFloatCastingOfIntegerDivision()

Description copied from class: Dialect

Does this dialect require that integer divisions be wrapped in cast() calls to tell the db parser the expected type.

Overrides:

requiresFloatCastingOfIntegerDivision in class Dialect

Returns:

True if integer divisions must be cast()ed to float

supportsResultSetPositionQueryMethodsOnForwardOnlyCursor

public boolean supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()

Description copied from class: Dialect

Does this dialect support asking the result set its positioning information on forward-only cursors?

Specifically, in the case of scrolling fetches, Hibernate needs to use ResultSet.isAfterLast() and ResultSet.isBeforeFirst(). Certain drivers do not allow access to these methods for forward-only cursors.

Overrides:

supportsResultSetPositionQueryMethodsOnForwardOnlyCursor in class Dialect

Returns:

True if methods like ResultSet.isAfterLast() and ResultSet.isBeforeFirst() are supported for forward only cursors; false otherwise.

supportsCircularCascadeDeleteConstraints

public boolean supportsCircularCascadeDeleteConstraints()

Description copied from class: Dialect

Does this dialect support definition of cascade delete constraints which can cause circular chains?

Overrides:

supportsCircularCascadeDeleteConstraints in class Dialect

Returns:

True if circular cascade delete constraints are supported; false otherwise.

supportsSubselectAsInPredicateLHS

public boolean supportsSubselectAsInPredicateLHS()

Description copied from class: Dialect

Is a subselect supported as the left-hand side (LHS) of an IN predicates?

In other words, is syntax like <subquery> IN (1, 2, 3) supported?

Overrides:

supportsSubselectAsInPredicateLHS in class Dialect

Returns:

True if a subselect can appear as the LHS of an in-predicate; false otherwise.

supportsExpectedLobUsagePattern

public boolean supportsExpectedLobUsagePattern()

Description copied from class: Dialect

"Expected" LOB usage pattern is such that I can perform an insert via prepared statement with a parameter binding for a LOB value without crazy casting to JDBC driver implementation-specific classes.

Overrides:

supportsExpectedLobUsagePattern in class Dialect

Returns:

True if normal LOB usage patterns can be used with this driver; false if driver-specific hookiness needs to be applied.

supportsLobValueChangePropagation

public boolean supportsLobValueChangePropagation()

Description copied from class: Dialect

Does the dialect support propagating changes to LOB values back to the database? Talking about mutating the internal value of the locator, as opposed to supplying a new locator instance.

• For BLOBs, the internal value might be changed by: Blob.setBinaryStream(long), Blob.setBytes(long, byte[]), Blob.setBytes(long, byte[], int, int), or Blob.truncate(long).
• For CLOBs, the internal value might be changed by: Clob.setAsciiStream(long), Clob.setCharacterStream(long), Clob.setString(long, String), Clob.setString(long, String, int, int), or Clob.truncate(long).

Overrides:

supportsLobValueChangePropagation in class Dialect

Returns:

True if the changes are propagated back to the database; false otherwise.

supportsUnboundedLobLocatorMaterialization

public boolean supportsUnboundedLobLocatorMaterialization()

Description copied from class: Dialect

Is it supported to materialize a LOB locator outside the transaction in which it was created?

Overrides:

supportsUnboundedLobLocatorMaterialization in class Dialect

Returns:

True if unbounded materialization is supported; false otherwise.

supportsSubqueryOnMutatingTable

public boolean supportsSubqueryOnMutatingTable()

Description copied from class: Dialect

Does this dialect support referencing the table being mutated in a subquery? The "table being mutated" is the table referenced in an update or delete query. And so can that table then be referenced in a subquery of the update or delete query?

For example, would the following two syntaxes be supported:

• delete from TABLE_A where ID not in (select ID from TABLE_A)
• update TABLE_A set NON_ID = 'something' where ID in (select ID from TABLE_A)

Overrides:

supportsSubqueryOnMutatingTable in class Dialect

Returns:

True if this dialect allows references the mutating table from a subquery.

supportsExistsInSelect

public boolean supportsExistsInSelect()

Description copied from class: Dialect

Does the dialect support an exists statement in the select clause?

Overrides:

supportsExistsInSelect in class Dialect

Returns:

True if exists checks are allowed in the select clause; false otherwise.

doesReadCommittedCauseWritersToBlockReaders

public boolean doesReadCommittedCauseWritersToBlockReaders()

Description copied from class: Dialect

For the underlying database, is READ_COMMITTED isolation implemented by forcing readers to wait for write locks to be released?

Overrides:

doesReadCommittedCauseWritersToBlockReaders in class Dialect

Returns:

True if writers block readers to achieve READ_COMMITTED; false otherwise.

doesRepeatableReadCauseReadersToBlockWriters

public boolean doesRepeatableReadCauseReadersToBlockWriters()

Description copied from class: Dialect

For the underlying database, is REPEATABLE_READ isolation implemented by forcing writers to wait for read locks to be released?

Overrides:

doesRepeatableReadCauseReadersToBlockWriters in class Dialect

Returns:

True if readers block writers to achieve REPEATABLE_READ; false otherwise.

supportsBindAsCallableArgument

public boolean supportsBindAsCallableArgument()

Description copied from class: Dialect

Does this dialect support using a JDBC bind parameter as an argument to a function or procedure call?

Overrides:

supportsBindAsCallableArgument in class Dialect

Returns:

Returns true if the database supports accepting bind params as args, false otherwise. The default is true.

supportsTupleCounts

public boolean supportsTupleCounts()

Description copied from class: Dialect

Does this dialect support count(a,b)?

Overrides:

supportsTupleCounts in class Dialect

Returns:

True if the database supports counting tuples; false otherwise.

requiresParensForTupleCounts

public boolean requiresParensForTupleCounts()

Description copied from class: Dialect

If Dialect.supportsTupleCounts() is true, does this dialect require the tuple to be delimited with parentheses?

Overrides:

requiresParensForTupleCounts in class Dialect

Returns:

boolean

supportsTupleDistinctCounts

public boolean supportsTupleDistinctCounts()

Description copied from class: Dialect

Does this dialect support count(distinct a,b)?

Overrides:

supportsTupleDistinctCounts in class Dialect

Returns:

True if the database supports counting distinct tuples; false otherwise.

requiresParensForTupleDistinctCounts

public boolean requiresParensForTupleDistinctCounts()

Description copied from class: Dialect

If Dialect.supportsTupleDistinctCounts() is true, does this dialect require the tuple to be delimited with parentheses?

Overrides:

requiresParensForTupleDistinctCounts in class Dialect

Returns:

boolean

getInExpressionCountLimit

public int getInExpressionCountLimit()

Description copied from class: Dialect

Return the limit that the underlying database places on the number of elements in an IN predicate. If the database defines no such limits, simply return zero or a number smaller than zero.

Overrides:

getInExpressionCountLimit in class Dialect

Returns:

The limit, or a non-positive integer to indicate no limit.

getParameterCountLimit

public int getParameterCountLimit()

Description copied from class: Dialect

Return the limit that the underlying database places on the number of parameters that can be defined for a PreparedStatement. If the database defines no such limits, simply return zero or a number smaller than zero. By default, Dialect returns the same value as Dialect.getInExpressionCountLimit().

Overrides:

getParameterCountLimit in class Dialect

Returns:

The limit, or a non-positive integer to indicate no limit.

forceLobAsLastValue

public boolean forceLobAsLastValue()

Description copied from class: Dialect

Must LOB values occur last in inserts and updates?

Overrides:

forceLobAsLastValue in class Dialect

Returns:

boolean True if Lob values should be last, false if it does not matter.

isEmptyStringTreatedAsNull

public boolean isEmptyStringTreatedAsNull()

Description copied from class: Dialect

Return whether the dialect considers an empty string value to be null.

Overrides:

isEmptyStringTreatedAsNull in class Dialect

Returns:

boolean True if an empty string is treated as null, false otherwise.

useFollowOnLocking

public boolean useFollowOnLocking(String sql,
 QueryOptions queryOptions)

Description copied from class: Dialect

Some dialects have trouble applying pessimistic locking depending upon what other query options are specified (paging, ordering, etc). This method allows these dialects to request that locking be applied by subsequent selects.

Overrides:

useFollowOnLocking in class Dialect

Returns:

true indicates that the dialect requests that locking be applied by subsequent select; false (the default) indicates that locking should be applied to the main SQL statement.

getUniqueDelegate

public UniqueDelegate getUniqueDelegate()

Description copied from class: Dialect

Get the UniqueDelegate supported by this dialect

Overrides:

getUniqueDelegate in class Dialect

Returns:

The UniqueDelegate

getQueryHintString

public String getQueryHintString(String query,
 List<String> hintList)

Description copied from class: Dialect

Apply a hint to the given SQL query.

The entire query is provided, allowing full control over the placement and syntax of the hint.

By default, ignore the hint and simply return the query.

Overrides:

getQueryHintString in class Dialect

Parameters:

query - The query to which to apply the hint.

hintList - The hints to apply

Returns:

The modified SQL

getQueryHintString

public String getQueryHintString(String query,
 String hints)

Description copied from class: Dialect

Apply a hint to the given SQL query.

The entire query is provided, allowing full control over the placement and syntax of the hint.

By default, ignore the hint and simply return the query.

Overrides:

getQueryHintString in class Dialect

Parameters:

query - The query to which to apply the hint.

hints - The hints to apply

Returns:

The modified SQL

defaultScrollMode

public ScrollMode defaultScrollMode()

Description copied from class: Dialect

A default ScrollMode to be used by Query.scroll().

Overrides:

defaultScrollMode in class Dialect

Returns:

the default ScrollMode to use.

supportsOffsetInSubquery

public boolean supportsOffsetInSubquery()

Description copied from class: Dialect

Does this dialect support offset in subqueries?

For example:

 select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1 offset 1)
 

Overrides:

supportsOffsetInSubquery in class Dialect

Returns:

true if it does

supportsOrderByInSubquery

public boolean supportsOrderByInSubquery()

Description copied from class: Dialect

Does this dialect support the order by clause in subqueries?

For example:

 select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1)
 

Overrides:

supportsOrderByInSubquery in class Dialect

Returns:

true if it does

supportsSubqueryInSelect

public boolean supportsSubqueryInSelect()

Description copied from class: Dialect

Does this dialect support subqueries in the select clause?

For example:

 select col1, (select col2 from Table2 where ...) from Table1
 

Overrides:

supportsSubqueryInSelect in class Dialect

Returns:

true if it does

supportsInsertReturning

public boolean supportsInsertReturning()

Description copied from class: Dialect

Does this dialect fully support returning arbitrary generated column values after execution of an insert statement, using native SQL syntax?

Support for identity columns is insufficient here, we require something like:

1. insert ... returning ...
2. select from final table (insert ... )

Overrides:

supportsInsertReturning in class Dialect

Returns:

true if InsertReturningDelegate works for any sort of primary key column (not just identity columns), or false if InsertReturningDelegate does not work, or only works for specialized identity/"autoincrement" columns

See Also:

• InsertReturningDelegate

supportsInsertReturningGeneratedKeys

public boolean supportsInsertReturningGeneratedKeys()

Description copied from class: Dialect

Does this dialect fully support returning arbitrary generated column values after execution of an insert statement, using the JDBC method Connection.prepareStatement(String, String[]).

Support for returning the generated value of an identity column via the JDBC method Connection.prepareStatement(String, int) is insufficient here.

Overrides:

supportsInsertReturningGeneratedKeys in class Dialect

Returns:

true if GetGeneratedKeysDelegate works for any sort of primary key column (not just identity columns), or false if GetGeneratedKeysDelegate does not work, or only works for specialized identity/"autoincrement" columns

See Also:

• OnExecutionGenerator.getGeneratedIdentifierDelegate(org.hibernate.persister.entity.EntityPersister)
• GetGeneratedKeysDelegate

supportsFetchClause

public boolean supportsFetchClause(FetchClauseType type)

Description copied from class: Dialect

Does this dialect support the given FETCH clause type.

Overrides:

supportsFetchClause in class Dialect

Parameters:

type - The fetch clause type

Returns:

true if the underlying database supports the given fetch clause type, false otherwise. The default is false.

supportsWindowFunctions

public boolean supportsWindowFunctions()

Description copied from class: Dialect

Does this dialect support window functions like row_number() over (..)?

Overrides:

supportsWindowFunctions in class Dialect

Returns:

true if the underlying database supports window functions, false otherwise. The default is false.

supportsLateral

public boolean supportsLateral()

Description copied from class: Dialect

Does this dialect support the SQL lateral keyword or a proprietary alternative?

Overrides:

supportsLateral in class Dialect

Returns:

true if the underlying database supports lateral, false otherwise. The default is false.

getCallableStatementSupport

public CallableStatementSupport getCallableStatementSupport()

Description copied from class: Dialect

The CallableStatementSupport for this database. Does this database support returning cursors?

Overrides:

getCallableStatementSupport in class Dialect

getNameQualifierSupport

public NameQualifierSupport getNameQualifierSupport()

Description copied from class: Dialect

The support for qualified identifiers.

By default, decide based on DatabaseMetaData.

Overrides:

getNameQualifierSupport in class Dialect

Returns:

The NameQualifierSupport, or null to use DatabaseMetaData.

getBatchLoadSizingStrategy

public MultiKeyLoadSizingStrategy getBatchLoadSizingStrategy()

Description copied from class: Dialect

The strategy used to determine the appropriate number of keys to load in a single SQL query with batch-fetch loading.

Overrides:

getBatchLoadSizingStrategy in class Dialect

See Also:

• BatchSize

getMultiKeyLoadSizingStrategy

public MultiKeyLoadSizingStrategy getMultiKeyLoadSizingStrategy()

Description copied from class: Dialect

The strategy used to determine the appropriate number of keys to load in a single SQL query with multi-key loading.

Overrides:

getMultiKeyLoadSizingStrategy in class Dialect

See Also:

• Session.byMultipleIds(java.lang.Class<T>)
• Session.byMultipleNaturalId(java.lang.Class<T>)

isJdbcLogWarningsEnabledByDefault

public boolean isJdbcLogWarningsEnabledByDefault()

Description copied from class: Dialect

Is JDBC statement warning logging enabled by default?

Overrides:

isJdbcLogWarningsEnabledByDefault in class Dialect

augmentPhysicalTableTypes

public void augmentPhysicalTableTypes(List<String> tableTypesList)

Overrides:

augmentPhysicalTableTypes in class Dialect

augmentRecognizedTableTypes

public void augmentRecognizedTableTypes(List<String> tableTypesList)

Overrides:

augmentRecognizedTableTypes in class Dialect

supportsPartitionBy

public boolean supportsPartitionBy()

Description copied from class: Dialect

Does is dialect support partition by?

Overrides:

supportsPartitionBy in class Dialect

supportsNamedParameters

public boolean supportsNamedParameters(DatabaseMetaData databaseMetaData)
                                throws SQLException

Description copied from class: Dialect

Override DatabaseMetaData.supportsNamedParameters().

Overrides:

supportsNamedParameters in class Dialect

Throws:

SQLException - Accessing the DatabaseMetaData cause an exception. Just rethrow and Hibernate will handle it.

getNationalizationSupport

public NationalizationSupport getNationalizationSupport()

Description copied from class: Dialect

Determines whether this database requires the use of explicitly nationalized character (Unicode) data types.

That is, whether the use of Types.NCHAR, Types.NVARCHAR, and Types.NCLOB is required for nationalized character data.

Overrides:

getNationalizationSupport in class Dialect

getAggregateSupport

public AggregateSupport getAggregateSupport()

Description copied from class: Dialect

How does this dialect support aggregate types like SqlTypes.STRUCT.

Overrides:

getAggregateSupport in class Dialect

supportsStandardArrays

public boolean supportsStandardArrays()

Description copied from class: Dialect

Does this database have native support for ANSI SQL standard arrays which are expressed in terms of the element type name: integer array.

Overrides:

supportsStandardArrays in class Dialect

Returns:

boolean

getArrayTypeName

public String getArrayTypeName(String javaElementTypeName,
 String elementTypeName,
 Integer maxLength)

Description copied from class: Dialect

The SQL type name for the array type with elements of the given type name.

The ANSI-standard syntax is integer array.

Overrides:

getArrayTypeName in class Dialect

appendArrayLiteral

public void appendArrayLiteral(SqlAppender appender,
 Object[] literal,
 JdbcLiteralFormatter<Object> elementFormatter,
 WrapperOptions wrapperOptions)

Description copied from class: Dialect

Append an array literal with the given elements to the given SqlAppender.

Overrides:

appendArrayLiteral in class Dialect

supportsDistinctFromPredicate

public boolean supportsDistinctFromPredicate()

Description copied from class: Dialect

Does this dialect support some kind of distinct from predicate?

That is, does it support syntax like:

 ... where FIRST_NAME IS DISTINCT FROM LAST_NAME
 

Overrides:

supportsDistinctFromPredicate in class Dialect

Returns:

True if this SQL dialect is known to support some kind of distinct from predicate; false otherwise

getPreferredSqlTypeCodeForArray

public int getPreferredSqlTypeCodeForArray()

Description copied from class: Dialect

The JDBC type code to use for mapping properties of basic Java array or Collection types.

Usually SqlTypes.ARRAY or SqlTypes.VARBINARY.

Overrides:

getPreferredSqlTypeCodeForArray in class Dialect

Returns:

one of the type codes defined by SqlTypes.

getPreferredSqlTypeCodeForBoolean

public int getPreferredSqlTypeCodeForBoolean()

Description copied from class: Dialect

The JDBC type code to use for mapping properties of Java type boolean.

Usually Types.BOOLEAN or Types.BIT.

Overrides:

getPreferredSqlTypeCodeForBoolean in class Dialect

Returns:

one of the type codes defined by Types.

supportsNonQueryWithCTE

public boolean supportsNonQueryWithCTE()

Description copied from class: Dialect

Does this dialect support insert, update, and delete statements with Common Table Expressions (CTEs)?

Overrides:

supportsNonQueryWithCTE in class Dialect

Returns:

true if non-query statements are supported with CTE

supportsRecursiveCTE

public boolean supportsRecursiveCTE()

Description copied from class: Dialect

Does this dialect/database support recursive CTEs?

Overrides:

supportsRecursiveCTE in class Dialect

Returns:

true if recursive CTEs are supported

supportsValuesList

public boolean supportsValuesList()

Description copied from class: Dialect

Does this dialect support values lists of form VALUES (1), (2), (3)?

Overrides:

supportsValuesList in class Dialect

Returns:

true if values list are supported

supportsValuesListForInsert

public boolean supportsValuesListForInsert()

Description copied from class: Dialect

Does this dialect support values lists of form VALUES (1), (2), (3) in insert statements?

Overrides:

supportsValuesListForInsert in class Dialect

Returns:

true if values list are allowed in insert statements

supportsSkipLocked

public boolean supportsSkipLocked()

Description copied from class: Dialect

Does this dialect support SKIP_LOCKED timeout.

Overrides:

supportsSkipLocked in class Dialect

Returns:

true if SKIP_LOCKED is supported

supportsNoWait

public boolean supportsNoWait()

Description copied from class: Dialect

Does this dialect support NO_WAIT timeout.

Overrides:

supportsNoWait in class Dialect

Returns:

true if NO_WAIT is supported

supportsWait

public boolean supportsWait()

Description copied from class: Dialect

Does this dialect support WAIT timeout.

Overrides:

supportsWait in class Dialect

Returns:

true if WAIT is supported

appendLiteral

public void appendLiteral(SqlAppender appender,
 String literal)

Description copied from class: Dialect

Append a literal string to the given SqlAppender.

Overrides:

appendLiteral in class Dialect

appendBinaryLiteral

public void appendBinaryLiteral(SqlAppender appender,
 byte[] bytes)

Description copied from class: Dialect

Append a binary literal to the given SqlAppender.

Overrides:

appendBinaryLiteral in class Dialect

supportsJdbcConnectionLobCreation

public boolean supportsJdbcConnectionLobCreation(DatabaseMetaData databaseMetaData)

Description copied from class: Dialect

Check whether the JDBC Connection supports creating LOBs via Connection.createBlob(), Connection.createNClob(), or Connection.createClob().

Overrides:

supportsJdbcConnectionLobCreation in class Dialect

Parameters:

databaseMetaData - JDBC DatabaseMetaData which can be used if LOB creation is supported only starting from a given driver version

Returns:

true if LOBs can be created via the JDBC Connection.

supportsMaterializedLobAccess

public boolean supportsMaterializedLobAccess()

Description copied from class: Dialect

Check whether the JDBC driver allows setting LOBs via PreparedStatement.setBytes(int, byte[]), PreparedStatement.setNString(int, String), or PreparedStatement.setString(int, String) APIs.

Overrides:

supportsMaterializedLobAccess in class Dialect

Returns:

true if LOBs can be set with the materialized APIs.

useMaterializedLobWhenCapacityExceeded

public boolean useMaterializedLobWhenCapacityExceeded()

Description copied from class: Dialect

Whether to switch:

• from VARCHAR-like types to SqlTypes.MATERIALIZED_CLOB types when the requested size for a type exceeds the Dialect.getMaxVarcharCapacity(),
• from NVARCHAR-like types to SqlTypes.MATERIALIZED_NCLOB types when the requested size for a type exceeds the Dialect.getMaxNVarcharCapacity(), and
• from VARBINARY-like types to SqlTypes.MATERIALIZED_BLOB types when the requested size for a type exceeds the Dialect.getMaxVarbinaryCapacity().

Overrides:

useMaterializedLobWhenCapacityExceeded in class Dialect

Returns:

true if materialized LOBs should be used for capacity exceeding types.

addSqlHintOrComment

public String addSqlHintOrComment(String sql,
 QueryOptions queryOptions,
 boolean commentsEnabled)

Description copied from class: Dialect

Modify the SQL, adding hints or comments, if necessary

Overrides:

addSqlHintOrComment in class Dialect

prependComment

public String prependComment(String sql,
 String comment)

Description copied from class: Dialect

Prepend a comment to the given SQL fragment.

Overrides:

prependComment in class Dialect

escapeComment

public static String escapeComment(String comment)

getHqlTranslator

public HqlTranslator getHqlTranslator()

Description copied from class: Dialect

Return an HqlTranslator specific to this dialect, or null to use the standard translator.

Note that QueryEngineOptions.getCustomHqlTranslator() has higher precedence since it comes directly from the user config.

Overrides:

getHqlTranslator in class Dialect

See Also:

• StandardHqlTranslator
• QueryEngine.getHqlTranslator()

getSqmTranslatorFactory

public SqmTranslatorFactory getSqmTranslatorFactory()

Description copied from class: Dialect

Return a SqmTranslatorFactory specific to this dialect, or null to use the standard translator.

Note that QueryEngineOptions.getCustomSqmTranslatorFactory() has higher precedence since it comes directly from the user config.

Overrides:

getSqmTranslatorFactory in class Dialect

See Also:

• StandardSqmTranslator
• QueryEngine.getSqmTranslatorFactory()

getSqlAstTranslatorFactory

public SqlAstTranslatorFactory getSqlAstTranslatorFactory()

Description copied from class: Dialect

Return a SqlAstTranslatorFactory specific to this dialect, or null to use the standard translator.

Overrides:

getSqlAstTranslatorFactory in class Dialect

See Also:

• StandardSqlAstTranslatorFactory
• JdbcEnvironment.getSqlAstTranslatorFactory()

getGroupBySelectItemReferenceStrategy

public SelectItemReferenceStrategy getGroupBySelectItemReferenceStrategy()

Description copied from class: Dialect

Determine how selected items are referenced in the group by clause.

Overrides:

getGroupBySelectItemReferenceStrategy in class Dialect

getSizeStrategy

public Dialect.SizeStrategy getSizeStrategy()

Description copied from class: Dialect

A custom Dialect.SizeStrategy for column types.

Overrides:

getSizeStrategy in class Dialect

getMaxVarcharLength

public int getMaxVarcharLength()

Description copied from class: Dialect

The biggest size value that can be supplied as argument to a Types.VARCHAR-like type.

For longer column lengths, use some sort of text-like type for the column.

Overrides:

getMaxVarcharLength in class Dialect

getMaxNVarcharLength

public int getMaxNVarcharLength()

Description copied from class: Dialect

The biggest size value that can be supplied as argument to a Types.NVARCHAR-like type.

For longer column lengths, use some sort of ntext-like type for the column.

Overrides:

getMaxNVarcharLength in class Dialect

getMaxVarbinaryLength

public int getMaxVarbinaryLength()

Description copied from class: Dialect

The biggest size value that can be supplied as argument to a Types.VARBINARY-like type.

For longer column lengths, use some sort of image-like type for the column.

Overrides:

getMaxVarbinaryLength in class Dialect

getMaxVarcharCapacity

public int getMaxVarcharCapacity()

Description copied from class: Dialect

The longest possible length of a Types.VARCHAR-like column.

For longer column lengths, use some sort of clob-like type for the column.

Overrides:

getMaxVarcharCapacity in class Dialect

getMaxNVarcharCapacity

public int getMaxNVarcharCapacity()

Description copied from class: Dialect

The longest possible length of a Types.NVARCHAR-like column.

For longer column lengths, use some sort of nclob-like type for the column.

Overrides:

getMaxNVarcharCapacity in class Dialect

getMaxVarbinaryCapacity

public int getMaxVarbinaryCapacity()

Description copied from class: Dialect

The longest possible length of a Types.VARBINARY-like column.

For longer column lengths, use some sort of blob-like type for the column.

Overrides:

getMaxVarbinaryCapacity in class Dialect

getDefaultLobLength

public long getDefaultLobLength()

Description copied from class: Dialect

This is the default length for a generated column of type BLOB or CLOB mapped to Blob or Clob, if LOB columns have a length in this dialect.

Overrides:

getDefaultLobLength in class Dialect

Returns:

1048576L by default

See Also:

• Length.LOB_DEFAULT
• BlobJavaType
• ClobJavaType

getDefaultDecimalPrecision

public int getDefaultDecimalPrecision()

Description copied from class: Dialect

This is the default precision for a generated column of exact numeric type DECIMAL or NUMERIC mapped to a BigInteger or BigDecimal.

Usually returns the maximum precision of the database, except when there is no such maximum precision, or the maximum precision is very high.

Overrides:

getDefaultDecimalPrecision in class Dialect

Returns:

the default precision, in decimal digits

See Also:

• BigDecimalJavaType
• BigIntegerJavaType

getDefaultTimestampPrecision

public int getDefaultTimestampPrecision()

Description copied from class: Dialect

This is the default precision for a generated column of type TIMESTAMP mapped to a Timestamp or LocalDateTime.

Usually 6 (microseconds) or 3 (milliseconds).

Overrides:

getDefaultTimestampPrecision in class Dialect

Returns:

the default precision, in decimal digits, of the fractional seconds field

See Also:

• JdbcTimestampJavaType
• LocalDateTimeJavaType
• OffsetDateTimeJavaType
• ZonedDateTimeJavaType
• InstantJavaType

getFloatPrecision

public int getFloatPrecision()

Description copied from class: Dialect

This is the default precision for a generated column mapped to a Java Float or float. That is, a value representing "single precision".

Usually 24 binary digits, at least for databases with a conventional interpretation of the ANSI SQL specification.

Overrides:

getFloatPrecision in class Dialect

Returns:

a value representing "single precision", usually in binary digits, but sometimes in decimal digits

getDoublePrecision

public int getDoublePrecision()

Description copied from class: Dialect

This is the default precision for a generated column mapped to a Java Double or double. That is, a value representing "double precision".

Usually 53 binary digits, at least for databases with a conventional interpretation of the ANSI SQL specification.

Overrides:

getDoublePrecision in class Dialect

Returns:

a value representing "double precision", usually in binary digits, but sometimes in decimal digits

getFractionalSecondPrecisionInNanos

public long getFractionalSecondPrecisionInNanos()

Description copied from class: Dialect

The "native" precision for arithmetic with datetimes and day-to-second durations. Datetime differences will be calculated with this precision except when a precision is explicitly specified as a TemporalUnit.

Usually 1 (nanoseconds), 1_000 (microseconds), or 1_000_000 (milliseconds).

Overrides:

getFractionalSecondPrecisionInNanos in class Dialect

Returns:

the precision, specified as a quantity of nanoseconds

See Also:

• TemporalUnit.NATIVE

supportsBitType

public boolean supportsBitType()

Description copied from class: Dialect

Does this dialect have a true SQL BIT type with just two values (0 and 1) or, even better, a proper SQL BOOLEAN type, or does Types.BIT get mapped to a numeric type with more than two values?

Overrides:

supportsBitType in class Dialect

Returns:

true if there is a BIT or BOOLEAN type

supportsPredicateAsExpression

public boolean supportsPredicateAsExpression()

Description copied from class: Dialect

Whether a predicate like a > 0 can appear in an expression context, for example, in a select list item.

Overrides:

supportsPredicateAsExpression in class Dialect

getLockRowIdentifier

public RowLockStrategy getLockRowIdentifier(LockMode lockMode)

Description copied from class: Dialect

Obtain a RowLockStrategy for the given LockMode.

Overrides:

getLockRowIdentifier in class Dialect

generatedAs

public String generatedAs(String generatedAs)

Description copied from class: Dialect

The generated as clause, or similar, for generated column declarations in DDL statements.

Overrides:

generatedAs in class Dialect

Parameters:

generatedAs - a SQL expression used to generate the column value

Returns:

The generated as clause containing the given expression

hasDataTypeBeforeGeneratedAs

public boolean hasDataTypeBeforeGeneratedAs()

Description copied from class: Dialect

Is an explicit column type required for generated as columns?

Overrides:

hasDataTypeBeforeGeneratedAs in class Dialect

Returns:

true if an explicit type is required

createOptionalTableUpdateOperation

public MutationOperation createOptionalTableUpdateOperation(EntityMutationTarget mutationTarget,
 OptionalTableUpdate optionalTableUpdate,
 SessionFactoryImplementor factory)

Description copied from class: Dialect

Create a MutationOperation for a updating an optional table

Overrides:

createOptionalTableUpdateOperation in class Dialect

canDisableConstraints

public boolean canDisableConstraints()

Description copied from class: Dialect

Is there some way to disable foreign key constraint checking while truncating tables? (If there's no way to do it, and if we can't batch truncate, we must drop and recreate the constraints instead.)

Overrides:

canDisableConstraints in class Dialect

Returns:

true if there is some way to do it

See Also:

• Dialect.getDisableConstraintsStatement()
• Dialect.getDisableConstraintStatement(String, String)

getDisableConstraintsStatement

public String getDisableConstraintsStatement()

Description copied from class: Dialect

A SQL statement that temporarily disables foreign key constraint checking for all tables.

Overrides:

getDisableConstraintsStatement in class Dialect

getEnableConstraintsStatement

public String getEnableConstraintsStatement()

Description copied from class: Dialect

A SQL statement that re-enables foreign key constraint checking for all tables.

Overrides:

getEnableConstraintsStatement in class Dialect

getDisableConstraintStatement

public String getDisableConstraintStatement(String tableName,
 String name)

Description copied from class: Dialect

A SQL statement that temporarily disables checking of the given foreign key constraint.

Overrides:

getDisableConstraintStatement in class Dialect

Parameters:

tableName - the name of the table

name - the name of the constraint

getEnableConstraintStatement

public String getEnableConstraintStatement(String tableName,
 String name)

Description copied from class: Dialect

A SQL statement that re-enables checking of the given foreign key constraint.

Overrides:

getEnableConstraintStatement in class Dialect

Parameters:

tableName - the name of the table

name - the name of the constraint

canBatchTruncate

public boolean canBatchTruncate()

Description copied from class: Dialect

Does the truncate table statement accept multiple tables?

Overrides:

canBatchTruncate in class Dialect

Returns:

true if it does

getTruncateTableStatements

public String[] getTruncateTableStatements(String[] tableNames)

Description copied from class: Dialect

A SQL statement or statements that truncate the given tables.

Overrides:

getTruncateTableStatements in class Dialect

Parameters:

tableNames - the names of the tables

getTruncateTableStatement

public String getTruncateTableStatement(String tableName)

Description copied from class: Dialect

A SQL statement that truncates the given table.

Overrides:

getTruncateTableStatement in class Dialect

Parameters:

tableName - the name of the table

appendDatetimeFormat

public void appendDatetimeFormat(SqlAppender appender,
 String format)

Description copied from class: Dialect

Translate the given datetime format string from the pattern language defined by Java's DateTimeFormatter to whatever pattern language is understood by the native datetime formatting function for this database (often the to_char() function).

Since it's never possible to translate every pattern letter sequences understood by DateTimeFormatter, only the following subset of pattern letters is accepted by Hibernate:

• G: era
• y: year of era
• Y: year of week-based year
• M: month of year
• w: week of week-based year (ISO week number)
• W: week of month
• E: day of week (name)
• e: day of week (number)
• d: day of month
• D: day of year
• a: AM/PM
• H: hour of day (24 hour time)
• h: hour of AM/PM (12 hour time)
• m: minutes
• s: seconds
• z,Z,x: timezone offset

In addition, punctuation characters and single-quoted literal strings are accepted.

Appends a pattern accepted by the function that formats dates and times in this dialect to a SQL fragment that is being constructed.

Overrides:

appendDatetimeFormat in class Dialect

translateExtractField

public String translateExtractField(TemporalUnit unit)

Description copied from class: Dialect

Return the name used to identify the given field as an argument to the extract() function, or of this dialect's equivalent function.

This method does not need to handle TemporalUnit.NANOSECOND, TemporalUnit.NATIVE, TemporalUnit.OFFSET, TemporalUnit.DATE, TemporalUnit.TIME, TemporalUnit.WEEK_OF_YEAR, nor TemporalUnit.WEEK_OF_MONTH, which are already desugared by ExtractFunction.

Overrides:

translateExtractField in class Dialect

translateDurationField

public String translateDurationField(TemporalUnit unit)

Description copied from class: Dialect

Return the name used to identify the given unit of duration as an argument to #timestampadd() or #timestampdiff(), or of this dialect's equivalent functions.

This method does not need to handle TemporalUnit.NANOSECOND, TemporalUnit.NATIVE, TemporalUnit.OFFSET, TemporalUnit.DAY_OF_WEEK, TemporalUnit.DAY_OF_MONTH, TemporalUnit.DAY_OF_YEAR, TemporalUnit.DATE, TemporalUnit.TIME, TemporalUnit.TIMEZONE_HOUR, TemporalUnit.TIMEZONE_MINUTE, TemporalUnit.WEEK_OF_YEAR, nor TemporalUnit.WEEK_OF_MONTH, which are not units of duration.

Overrides:

translateDurationField in class Dialect

appendDateTimeLiteral

public void appendDateTimeLiteral(SqlAppender appender,
 TemporalAccessor temporalAccessor,
 TemporalType precision,
 TimeZone jdbcTimeZone)

Description copied from class: Dialect

Append a datetime literal representing the given java.time value to the given SqlAppender.

Overrides:

appendDateTimeLiteral in class Dialect

appendDateTimeLiteral

public void appendDateTimeLiteral(SqlAppender appender,
 Date date,
 TemporalType precision,
 TimeZone jdbcTimeZone)

Description copied from class: Dialect

Append a datetime literal representing the given Date value to the given SqlAppender.

Overrides:

appendDateTimeLiteral in class Dialect

appendDateTimeLiteral

public void appendDateTimeLiteral(SqlAppender appender,
 Calendar calendar,
 TemporalType precision,
 TimeZone jdbcTimeZone)

Description copied from class: Dialect

Append a datetime literal representing the given Calendar value to the given SqlAppender.

Overrides:

appendDateTimeLiteral in class Dialect

appendIntervalLiteral

public void appendIntervalLiteral(SqlAppender appender,
 Duration literal)

Description copied from class: Dialect

Append a literal SQL interval representing the given Java Duration.

Overrides:

appendIntervalLiteral in class Dialect

appendUUIDLiteral

public void appendUUIDLiteral(SqlAppender appender,
 UUID literal)

Description copied from class: Dialect

Append a literal SQL uuid representing the given Java UUID.

This is usually a cast() expression, but it might be a function call.

Overrides:

appendUUIDLiteral in class Dialect

supportsTemporalLiteralOffset

public boolean supportsTemporalLiteralOffset()

Description copied from class: Dialect

Does this dialect supports timezone offsets in temporal literals.

Overrides:

supportsTemporalLiteralOffset in class Dialect

getTimeZoneSupport

public TimeZoneSupport getTimeZoneSupport()

Description copied from class: Dialect

How the dialect supports time zone types like Types.TIMESTAMP_WITH_TIMEZONE.

Overrides:

getTimeZoneSupport in class Dialect

rowId

public String rowId(String rowId)

Description copied from class: Dialect

The name of a rowid-like pseudo-column which acts as a high-performance row locator, or null if this dialect has no such pseudo-column.

If the rowid-like value is an explicitly-declared named column instead of an implicit pseudo-column, and if the given name is nonempty, return the given name.

Overrides:

rowId in class Dialect

Parameters:

rowId - the name specified by RowId.value(), which is ignored if Dialect.getRowIdColumnString(java.lang.String) is not overridden

rowIdSqlType

public int rowIdSqlType()

Description copied from class: Dialect

The JDBC type code of the rowid-like pseudo-column which acts as a high-performance row locator.

Overrides:

rowIdSqlType in class Dialect

Returns:

Types.ROWID by default

getRowIdColumnString

public String getRowIdColumnString(String rowId)

Description copied from class: Dialect

If this dialect requires that the rowid column be declared explicitly, return the DDL column definition.

Overrides:

getRowIdColumnString in class Dialect

Returns:

the DDL column definition, or null if the rowid is an implicit pseudo-column