java.lang.Object
- org.hibernate.dialect.Dialect
- - org.hibernate.dialect.HSQLDialect

All Implemented Interfaces:

FunctionContributor, TypeContributor, ConversionContext
```
public class HSQLDialect
extends Dialect
```
A SQL dialect for HSQLDB (HyperSQL) 2.6.1 and above.

Nested Class Summary
- Nested classes/interfaces inherited from class org.hibernate.dialect.Dialect
  Dialect.SizeStrategy, Dialect.SizeStrategyImpl

Field Summary
- 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

HSQLDialect()

HSQLDialect(DatabaseVersion version)

HSQLDialect(DialectResolutionInfo info)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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).
`IdentifierHelper`	`buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)`	The `IdentifierHelper` indicated by this dialect for handling identifier conversions.
`String`	`castPattern(CastType from, CastType to)`	Obtain a pattern for the SQL equivalent to a `cast()` function call.
`protected String`	`columnType(int sqlTypeCode)`	The database column type name for a given JDBC type code defined in `Types` or `SqlTypes`.
`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.
`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?
`String`	`extractPattern(TemporalUnit unit)`	Obtain a pattern for the SQL equivalent to an `extract()` function call.
`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`	`getCurrentTimestampSelectString()`	The command used to retrieve the current timestamp from the database.
`int`	`getDefaultStatementBatchSize()`	The default value to use for the configuration property "hibernate.jdbc.batch_size".
`SqmMultiTableInsertStrategy`	`getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`	The `SqmMultiTableInsertStrategy` to use when not specified by `QueryEngineOptions.getCustomSqmMultiTableInsertStrategy()`.
`SqmMultiTableMutationStrategy`	`getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`	The `SqmMultiTableMutationStrategy` to use when not specified by `QueryEngineOptions.getCustomSqmMultiTableMutationStrategy()`.
`String`	`getForUpdateString()`	Get the string to append to `SELECT` statements to acquire pessimistic UPGRADE locks for this dialect.
`IdentityColumnSupport`	`getIdentityColumnSupport()`	Get the appropriate `IdentityColumnSupport` for this dialect.
`LimitHandler`	`getLimitHandler()`	Obtain a `LimitHandler` that implements pagination support for `Query.setMaxResults(int)` and `Query.setFirstResult(int)`.
`protected DatabaseVersion`	`getMinimumSupportedVersion()`	Get the version of the SQL dialect that is the minimum supported by this implementation.
`NameQualifierSupport`	`getNameQualifierSupport()`	The support for qualified identifiers.
`NullOrdering`	`getNullOrdering()`	Returns the default ordering of null.
`String`	`getQuerySequencesString()`	Get the `select` command used retrieve the names of all sequences.
`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.
`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.
`SqlAstTranslatorFactory`	`getSqlAstTranslatorFactory()`	Return a `SqlAstTranslatorFactory` specific to this dialect, or `null` to use the standard translator.
`TemporaryTableKind`	`getSupportedTemporaryTableKind()`	The kind of temporary tables that are supported on this database.
`org.hibernate.query.sqm.mutation.internal.temptable.AfterUseAction`	`getTemporaryTableAfterUseAction()`	The action to take after finishing use of a temporary table.
`org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction`	`getTemporaryTableBeforeUseAction()`	The action to take before beginning use of a temporary table.
`String`	`getTemporaryTableCreateCommand()`	The command to create a temporary table.
`UniqueDelegate`	`getUniqueDelegate()`	Get the `UniqueDelegate` supported by this dialect
`ViolatedConstraintNameExtractor`	`getViolatedConstraintNameExtractor()`	A `ViolatedConstraintNameExtractor` for extracting the name of a violated constraint from a `SQLException`.
`void`	`initializeFunctionRegistry(FunctionContributions functionContributions)`	Initialize the given registry with any dialect-specific functions.
`boolean`	`isCurrentTimestampSelectStringCallable()`	Is the command returned by `Dialect.getCurrentTimestampSelectString()` treated as callable?
`protected void`	`registerDefaultKeywords()`	Register the reserved words of ANSI-standard SQL as keywords.
`boolean`	`requiresFloatCastingOfIntegerDivision()`	Does this dialect require that integer divisions be wrapped in `cast()` calls to tell the db parser the expected type.
`protected 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.
`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`	`supportsIfExistsAfterTableName()`	For dropping a table, can the phrase `if exists` be applied after the table name?
`boolean`	`supportsIfExistsBeforeTableName()`	For dropping a table, can the phrase `if exists` be applied before the table name?
`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`	`supportsNamedParameters(DatabaseMetaData databaseMetaData)`	Override `DatabaseMetaData.supportsNamedParameters()`.
`boolean`	`supportsOffsetInSubquery()`	Does this dialect support `offset` in subqueries?
`boolean`	`supportsRecursiveCTE()`	Does this dialect/database support recursive CTEs?
`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`	`supportsTupleCounts()`	Does this dialect support `count(a,b)`?
`boolean`	`supportsTupleDistinctCounts()`	Does this dialect support `count(distinct a,b)`?
`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`	`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.

Methods inherited from class org.hibernate.dialect.Dialect
addSqlHintOrComment, appendArrayLiteral, appendBinaryLiteral, appendDateTimeLiteral, appendDateTimeLiteral, appendDateTimeLiteral, appendIntervalLiteral, appendLiteral, appendLockHint, appendUUIDLiteral, applyLocksToSql, augmentPhysicalTableTypes, augmentRecognizedTableTypes, buildSQLExceptionConversionDelegate, canBatchTruncate, canCreateCatalog, canCreateSchema, canDisableConstraints, castType, checkVersion, closeQuote, contribute, contributeFunctions, contributeTypes, createOptionalTableUpdateOperation, currentDate, currentLocalTime, currentLocalTimestamp, defaultScrollMode, equivalentTypes, escapeComment, forceLobAsLastValue, generatedAs, getAddColumnString, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAggregateSupport, getAlterColumnTypeString, getAlterTableString, getArrayTypeName, getAuxiliaryDatabaseObjectExporter, getBatchLoadSizingStrategy, getCallableStatementSupport, getCaseInsensitiveLike, getCheckCondition, getCheckCondition, getColumnAliasExtractor, getColumnComment, getCreateCatalogCommand, getCreateIndexString, getCreateIndexTail, getCreateMultisetTableString, getCreateSchemaCommand, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCreateUserDefinedTypeExtensionsString, getCreateUserDefinedTypeKindString, getCurrentSchemaCommand, getDefaultDecimalPrecision, getDefaultLobLength, getDefaultNonContextualLobCreation, getDefaultProperties, getDefaultTimestampPrecision, getDefaultUseGetGeneratedKeys, getDisableConstraintsStatement, getDisableConstraintStatement, getDmlTargetColumnQualifierSupport, getDoublePrecision, getDropCatalogCommand, getDropForeignKeyString, getDropSchemaCommand, getDropTableString, getDropUniqueKeyString, getEnableConstraintsStatement, getEnableConstraintStatement, getEnumTypeDeclaration, getFallbackSchemaManagementTool, getFloatPrecision, getForeignKeyExporter, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateSkipLockedString, getForUpdateSkipLockedString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFractionalSecondPrecisionInNanos, getGroupBySelectItemReferenceStrategy, getHqlTranslator, getIndexExporter, getInExpressionCountLimit, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxAliasLength, getMaxIdentifierLength, getMaxNVarcharCapacity, getMaxNVarcharLength, getMaxVarbinaryCapacity, getMaxVarbinaryLength, getMaxVarcharCapacity, getMaxVarcharLength, getMultiKeyLoadSizingStrategy, getNationalizationSupport, getNativeIdentifierGenerationType, getNativeIdentifierGeneratorStrategy, getNativeParameterMarkerStrategy, getNoColumnsInsertString, getNullColumnString, getNullColumnString, getParameterCountLimit, getPreferredSqlTypeCodeForArray, getPreferredSqlTypeCodeForBoolean, getQueryHintString, getQueryHintString, getReadLockString, getReadLockString, getReadRowLockStrategy, getResultSet, getResultSet, getResultSet, getRowIdColumnString, getSchemaNameResolver, getSelectGUIDString, getSequenceExporter, getSizeStrategy, getSqmTranslatorFactory, getTableCleaner, getTableComment, getTableExporter, getTableMigrator, getTableTypeString, getTemporaryTableCreateOptions, getTemporaryTableDdlTransactionHandling, getTemporaryTableDropCommand, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getTimeZoneSupport, getTruncateTableStatement, getTruncateTableStatements, getUniqueKeyExporter, getUserDefinedTypeComment, getUserDefinedTypeExporter, getVersion, getWriteLockString, getWriteLockString, getWriteRowLockStrategy, hasAlterTable, hasDataTypeBeforeGeneratedAs, hasSelfReferentialForeignKeyBug, initDefaultProperties, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isJdbcLogWarningsEnabledByDefault, isLockTimeoutParameterized, openQuote, ordinal, prependComment, qualifyIndexName, quote, registerColumnTypes, registerKeyword, registerKeywords, registerResultSetOutParameter, registerResultSetOutParameter, requiresCastForConcatenatingNonStrings, requiresParensForTupleCounts, requiresParensForTupleDistinctCounts, resolveSqlTypeCode, resolveSqlTypeDescriptor, resolveSqlTypeLength, rowId, rowIdSqlType, supportsAlterColumnType, supportsBindAsCallableArgument, supportsBitType, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsFetchClause, supportsFractionalTimestampArithmetic, supportsIfExistsAfterAlterTable, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTypeName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTypeName, supportsInsertReturning, supportsInsertReturningGeneratedKeys, supportsJdbcConnectionLobCreation, supportsMaterializedLobAccess, supportsNoColumnsInsert, supportsNonQueryWithCTE, supportsNoWait, supportsNullPrecedence, supportsOrderByInSubquery, supportsOrdinalSelectItemReference, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPartitionBy, supportsPredicateAsExpression, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsSkipLocked, supportsStandardCurrentTimestampFunction, supportsSubqueryInSelect, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporalLiteralOffset, supportsTemporaryTablePrimaryKey, supportsTemporaryTables, supportsTruncateWithCast, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnionInSubquery, supportsValuesList, supportsValuesListForInsert, supportsWait, supportsWindowFunctions, toBooleanValueString, toQuotedIdentifier, toString, transformSelectString, translateDurationField, trimPattern, useFollowOnLocking, useInputStreamToInsertBlob, useMaterializedLobWhenCapacityExceeded

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - HSQLDialect
```
public HSQLDialect(DialectResolutionInfo info)
```
  - HSQLDialect
```
public HSQLDialect()
```
  - HSQLDialect
```
public HSQLDialect(DatabaseVersion version)
```
- Method Detail
  - getMinimumSupportedVersion
```
protected 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
  - registerDefaultKeywords
```
protected 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
  - columnType
```
protected 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:
    
    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.
    Mappings for Types.TIMESTAMP and Types.TIMESTAMP_WITH_TIMEZONE should support explicit specification of precision if possible.
    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.
    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
  - resolveSqlTypeCode
```
protected 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
  - 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
  - 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])
    
    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)
    
    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
  - 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
  - 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
  - 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()
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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.
  - 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.
  - 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
  - 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
  - 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
  - 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
  - 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
  - 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.
  - getNullOrdering
```
public NullOrdering getNullOrdering()
```
    Description copied from class: Dialect
    
    Returns the default ordering of null.
    
    Overrides:
    
    getNullOrdering in class Dialect
  - getFallbackSqmMutationStrategy
```
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor,
                                                                    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 rootEntityDescriptor,
                                                                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)
  - 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
  - getTemporaryTableCreateCommand
```
public String getTemporaryTableCreateCommand()
```
    Description copied from class: Dialect
    
    The command to create a temporary table.
    
    Overrides:
    
    getTemporaryTableCreateCommand in class Dialect
  - getTemporaryTableAfterUseAction
```
public org.hibernate.query.sqm.mutation.internal.temptable.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 org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction getTemporaryTableBeforeUseAction()
```
    Description copied from class: Dialect
    
    The action to take before beginning use of a temporary table.
    
    Overrides:
    
    getTemporaryTableBeforeUseAction in class Dialect
  - 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
  - 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
  - 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.
  - 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.
  - 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
  - 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.
  - 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.
  - 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
  - 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.
  - 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
  - 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
  - getIdentityColumnSupport
```
public IdentityColumnSupport getIdentityColumnSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate IdentityColumnSupport for this dialect.
    
    Overrides:
    
    getIdentityColumnSupport in class Dialect
    
    Returns:
    
    the IdentityColumnSupport
  - 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.
  - supportsNamedParameters
```
public boolean supportsNamedParameters(DatabaseMetaData databaseMetaData)
```
    Description copied from class: Dialect
    
    Override DatabaseMetaData.supportsNamedParameters().
    
    Overrides:
    
    supportsNamedParameters in class Dialect
  - 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.
  - 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
  - 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
  - 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()
  - getUniqueDelegate
```
public UniqueDelegate getUniqueDelegate()
```
    Description copied from class: Dialect
    
    Get the UniqueDelegate supported by this dialect
    
    Overrides:
    
    getUniqueDelegate in class Dialect
    
    Returns:
    
    The UniqueDelegate

Constructor	Description
`HSQLDialect()`
`HSQLDialect(DatabaseVersion version)`
`HSQLDialect(DialectResolutionInfo info)`

Class HSQLDialect

Nested Class Summary

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

Field Summary

Fields inherited from class org.hibernate.dialect.Dialect

Constructor Summary

Method Summary

Methods inherited from class org.hibernate.dialect.Dialect

Methods inherited from class java.lang.Object

Constructor Detail

HSQLDialect

HSQLDialect

HSQLDialect

Method Detail

getMinimumSupportedVersion

registerDefaultKeywords

columnType

resolveSqlTypeCode

getDefaultStatementBatchSize

initializeFunctionRegistry

currentTime

currentTimestamp

currentTimestampWithTimeZone

getSqlAstTranslatorFactory

castPattern

timestampaddPattern

timestampdiffPattern

extractPattern

supportsDistinctFromPredicate

supportsLockTimeouts

getForUpdateString

getLimitHandler

supportsIfExistsAfterTableName

supportsIfExistsBeforeTableName

getSequenceSupport

getQuerySequencesString

getSequenceInformationExtractor

supportsStandardArrays

getViolatedConstraintNameExtractor

getSelectClauseNullString

getNullOrdering

getFallbackSqmMutationStrategy

getFallbackSqmInsertStrategy

getSupportedTemporaryTableKind

getTemporaryTableCreateCommand

getTemporaryTableAfterUseAction

getTemporaryTableBeforeUseAction

supportsCurrentTimestampSelection

isCurrentTimestampSelectStringCallable

getCurrentTimestampSelectString

supportsCommentOn

doesReadCommittedCauseWritersToBlockReaders

doesRepeatableReadCauseReadersToBlockWriters

supportsLobValueChangePropagation

appendBooleanValueString

supportsTupleCounts

supportsTupleDistinctCounts

supportsOffsetInSubquery

supportsLateral

supportsRecursiveCTE

requiresFloatCastingOfIntegerDivision

getIdentityColumnSupport

getNameQualifierSupport

supportsNamedParameters

dropConstraints

getCascadeConstraintsString

appendDatetimeFormat

translateExtractField

buildIdentifierHelper

getUniqueDelegate