java.lang.Object
- org.hibernate.dialect.Dialect
- - org.hibernate.dialect.H2Dialect

All Implemented Interfaces:

ConversionContext
```
public class H2Dialect
extends Dialect
```
A SQL dialect for H2.

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_DEFAULT_BATCH_LOAD_SIZING_STRATEGY, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors
Constructor Description

H2Dialect()

H2Dialect(DatabaseVersion version)

H2Dialect(DialectResolutionInfo info)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`appendBooleanValueString(SqlAppender appender, boolean bool)`
`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`	`augmentPhysicalTableTypes(List<String> tableTypesList)`
`SQLExceptionConversionDelegate`	`buildSQLExceptionConversionDelegate()`	Build an instance of a `SQLExceptionConversionDelegate` for interpreting dialect-specific error or SQLState codes.
`protected String`	`castType(int sqlTypeCode)`
`protected String`	`columnType(int sqlTypeCode)`	The column type name for a given JDBC type code defined in `Types` or `SqlTypes`.
`void`	`contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)`	Allows the Dialect to contribute additional types
`String`	`currentTime()`	Translation of the HQL/JPQL `current_time` function, which maps to the Java type `java.sql.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 `java.sql.Timestamp` which is a datetime with no time zone.
`String`	`currentTimestampWithTimeZone()`	Translation of the HQL `offset_datetime` function, which maps to the Java type `java.time.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`	`dropConstraints()`	Do we need to drop constraints before dropping tables in this dialect?
`String`	`extractPattern(TemporalUnit unit)`	In H2, the extract() function does not return fractional seconds for the field `TemporalUnit.SECOND`.
`String`	`generatedAs(String generatedAs)`
`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()`	Retrieve the command used to retrieve the current timestamp from the database.
`boolean`	`getDefaultNonContextualLobCreation()`	The default value to use for the configuration property "hibernate.jdbc.lob.non_contextual_creation".
`int`	`getDefaultStatementBatchSize()`	The default value to use for the configuration property "hibernate.jdbc.batch_size".
`SqmMultiTableInsertStrategy`	`getFallbackSqmInsertStrategy(EntityMappingType entityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`
`SqmMultiTableMutationStrategy`	`getFallbackSqmMutationStrategy(EntityMappingType entityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`
`SelectItemReferenceStrategy`	`getGroupBySelectItemReferenceStrategy()`
`IdentityColumnSupport`	`getIdentityColumnSupport()`	Get the appropriate `IdentityColumnSupport`
`LimitHandler`	`getLimitHandler()`	Returns a `LimitHandler` that implements support for `Query.setMaxResults(int)` and `Query.setFirstResult(int)` for this dialect.
`int`	`getMaxVarcharLength()`	The longest possible length of a `Types.VARCHAR`-like column.
`NullOrdering`	`getNullOrdering()`	Returns the ordering of null.
`String`	`getQueryHintString(String query, String hints)`	Apply a hint to the query.
`String`	`getQuerySequencesString()`	Get the select command used retrieve the names of all sequences.
`SequenceInformationExtractor`	`getSequenceInformationExtractor()`	A source of `SequenceInformation`.
`SequenceSupport`	`getSequenceSupport()`
`SqlAstTranslatorFactory`	`getSqlAstTranslatorFactory()`	Return an SqlAstTranslatorFactory specific for the Dialect.
`TemporaryTableKind`	`getSupportedTemporaryTableKind()`
`org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction`	`getTemporaryTableBeforeUseAction()`
`TimeZoneSupport`	`getTimeZoneSupport()`	How the Dialect supports time zone types like `Types.TIMESTAMP_WITH_TIMEZONE`.
`ViolatedConstraintNameExtractor`	`getViolatedConstraintNameExtractor()`
`boolean`	`hasOddDstBehavior()`
`void`	`initializeFunctionRegistry(QueryEngine queryEngine)`	Initialize the given registry with any dialect-specific functions.
`boolean`	`isCurrentTimestampSelectStringCallable()`	Should the value returned by `Dialect.getCurrentTimestampSelectString()` be treated as callable.
`protected void`	`registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)`	Register ANSI-standard column types using the length limits defined by `Dialect.getMaxVarcharLength()`, `Dialect.getMaxNVarcharLength()`, and `Dialect.getMaxVarbinaryLength()`.
`int`	`registerResultSetOutParameter(CallableStatement statement, int position)`	Registers a parameter (either OUT, or the new REF_CURSOR param type available in Java 8) capable of returning `ResultSet` by position.
`boolean`	`requiresParensForTupleDistinctCounts()`	If `Dialect.supportsTupleDistinctCounts()` is true, does the Dialect require the tuple to be wrapped with parens?
`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.
`protected 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)`
`boolean`	`supportsCommentOn()`	Does this dialect/database support commenting on tables, columns, etc?
`boolean`	`supportsCurrentTimestampSelection()`	Does this dialect support a way to retrieve the database's current timestamp value?
`boolean`	`supportsDistinctFromPredicate()`	Is this SQL dialect known to support some kind of distinct from predicate.
`boolean`	`supportsFetchClause(FetchClauseType type)`	Does this dialect support the given fetch clause type.
`boolean`	`supportsIfExistsAfterAlterTable()`	For an "alter table", can the phrase "if exists" be applied?
`boolean`	`supportsIfExistsAfterTableName()`	For dropping a table, can the phrase "if exists" be applied after the table name?
`boolean`	`supportsIfExistsBeforeConstraintName()`	For dropping a constraint with an "alter table", 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`	`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`	`supportsOffsetInSubquery()`	Does this dialect support offset in subqueries? Ex: select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1 offset 1)
`boolean`	`supportsStandardArrays()`	Database has native support for SQL standard arrays which can be referred to through base type name.
`boolean`	`supportsTemporalLiteralOffset()`	Whether the Dialect supports timezone offset in temporal literals.
`boolean`	`supportsTupleCounts()`	Does this dialect support `count(a,b)`?
`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`	`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, applyLocksToSql, augmentRecognizedTableTypes, buildIdentifierHelper, canCreateCatalog, canCreateSchema, castPattern, checkVersion, closeQuote, currentDate, currentLocalTime, currentLocalTimestamp, defaultScrollMode, doesRepeatableReadCauseReadersToBlockWriters, equivalentTypes, escapeComment, forceLobAsLastValue, getAddColumnString, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAlterTableString, getArrayTypeName, getAuxiliaryDatabaseObjectExporter, getBooleanCheckCondition, getCallableStatementSupport, getCaseInsensitiveLike, getColumnAliasExtractor, getColumnComment, getCreateCatalogCommand, getCreateMultisetTableString, getCreateSchemaCommand, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCurrentSchemaCommand, getDefaultBatchLoadSizingStrategy, getDefaultDecimalPrecision, getDefaultLobLength, getDefaultProperties, getDefaultTimestampPrecision, getDefaultUseGetGeneratedKeys, getDoublePrecision, getDropCatalogCommand, getDropForeignKeyString, getDropSchemaCommand, getDropTableString, getEnumCheckCondition, getFloatPrecision, getForeignKeyExporter, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateSkipLockedString, getForUpdateSkipLockedString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getFractionalSecondPrecisionInNanos, getHqlTranslator, getIndexExporter, getInExpressionCountLimit, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxAliasLength, getMaxIdentifierLength, getMaxNVarcharLength, getMaxVarbinaryLength, getMinimumSupportedVersion, getNameQualifierSupport, getNationalizationSupport, getNativeIdentifierGeneratorStrategy, getNoColumnsInsertString, getNullColumnString, getNullColumnString, getPreferredSqlTypeCodeForArray, getPreferredSqlTypeCodeForBoolean, getQueryHintString, getReadLockString, getReadLockString, getReadRowLockStrategy, getResultSet, getResultSet, getResultSet, getSchemaNameResolver, getSelectClauseNullString, getSelectGUIDString, getSequenceExporter, getSizeStrategy, getSqmTranslatorFactory, getTableComment, getTableExporter, getTableTypeString, getTemporaryTableAfterUseAction, getTemporaryTableCreateCommand, getTemporaryTableCreateOptions, getTemporaryTableDdlTransactionHandling, getTemporaryTableDropCommand, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getUniqueDelegate, getUniqueKeyExporter, getVersion, getWriteLockString, getWriteLockString, getWriteRowLockStrategy, hasAlterTable, hasDataTypeBeforeGeneratedAs, hasSelfReferentialForeignKeyBug, initDefaultProperties, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isJdbcLogWarningsEnabledByDefault, isLockTimeoutParameterized, openQuote, prependComment, qualifyIndexName, quote, registerDefaultKeywords, registerKeyword, registerKeywords, registerResultSetOutParameter, requiresFloatCastingOfIntegerDivision, requiresParensForTupleCounts, resolveSqlTypeLength, supportsBindAsCallableArgument, supportsBitType, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsFractionalTimestampArithmetic, supportsIfExistsAfterConstraintName, supportsJdbcConnectionLobCreation, supportsLateral, supportsLockTimeouts, supportsNamedParameters, supportsNoColumnsInsert, supportsNonQueryWithCTE, supportsNoWait, supportsNullPrecedence, supportsOrderByInSubquery, supportsOrdinalSelectItemReference, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPartitionBy, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsSkipLocked, supportsSubqueryInSelect, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporaryTablePrimaryKey, supportsTemporaryTables, supportsTruncateWithCast, supportsTupleDistinctCounts, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnionInSubquery, supportsValuesList, supportsValuesListForInsert, supportsWait, toBooleanValueString, toString, transformSelectString, translateDurationField, trimPattern, useFollowOnLocking, useInputStreamToInsertBlob

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

- Constructor Detail
  - H2Dialect
```
public H2Dialect(DialectResolutionInfo info)
```
  - H2Dialect
```
public H2Dialect()
```
  - H2Dialect
```
public H2Dialect(DatabaseVersion version)
```
- Method Detail
  - 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
  - supportsStandardArrays
```
public boolean supportsStandardArrays()
```
    Description copied from class: Dialect
    
    Database has native support for SQL standard arrays which can be referred to through base type name. Oracle for example doesn't support this, but instead has support for named arrays.
    
    Overrides:
    
    supportsStandardArrays in class Dialect
    
    Returns:
    
    boolean
  - columnType
```
protected String columnType(int sqlTypeCode)
```
    Description copied from class: Dialect
    
    The 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.
    
    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
```
protected String castType(int sqlTypeCode)
```
    Overrides:
    
    castType in class Dialect
  - registerColumnTypes
```
protected 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
  - contributeTypes
```
public void contributeTypes(TypeContributions typeContributions,
                            ServiceRegistry serviceRegistry)
```
    Description copied from class: Dialect
    
    Allows the Dialect to contribute additional types
    
    Overrides:
    
    contributeTypes in class Dialect
    
    Parameters:
    
    typeContributions - Callback to contribute the types
    
    serviceRegistry - The service registry
  - 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
  - hasOddDstBehavior
```
public boolean hasOddDstBehavior()
```
  - initializeFunctionRegistry
```
public void initializeFunctionRegistry(QueryEngine queryEngine)
```
    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
    
    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])
    
    log10(arg)
    sign(arg)
    sin(arg)
    cos(arg)
    tan(arg)
    asin(arg)
    acos(arg)
    atan(arg)
    atan2(arg0, arg1)
    round(arg0, arg1)
    least(arg0, arg1, ...)
    greatest(arg0, 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
  - augmentPhysicalTableTypes
```
public void augmentPhysicalTableTypes(List<String> tableTypesList)
```
    Overrides:
    
    augmentPhysicalTableTypes in class Dialect
  - resolveSqlTypeCode
```
protected 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
  - resolveSqlTypeDescriptor
```
public JdbcType resolveSqlTypeDescriptor(String columnTypeName,
                                         int jdbcTypeCode,
                                         int precision,
                                         int scale,
                                         JdbcTypeRegistry jdbcTypeRegistry)
```
    Overrides:
    
    resolveSqlTypeDescriptor in class Dialect
  - 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
  - getMaxVarcharLength
```
public int getMaxVarcharLength()
```
    Description copied from class: Dialect
    
    The longest possible length of a Types.VARCHAR-like column. For longer column lengths, use some sort of text-like type for the column.
    
    Overrides:
    
    getMaxVarcharLength 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 java.sql.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 java.sql.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 java.time.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 an SqlAstTranslatorFactory specific for the Dialect. Return null to use Hibernate's standard translator.
    
    Overrides:
    
    getSqlAstTranslatorFactory in class Dialect
    
    See Also:
    
    StandardSqlAstTranslatorFactory, JdbcEnvironment.getSqlAstTranslatorFactory()
  - extractPattern
```
public String extractPattern(TemporalUnit unit)
```
    In H2, the extract() function does not return fractional seconds for the field TemporalUnit.SECOND. We work around this here with two calls to extract().
    
    Overrides:
    
    extractPattern in class Dialect
    
    Parameters:
    
    unit - the first argument
  - 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
  - supportsTemporalLiteralOffset
```
public boolean supportsTemporalLiteralOffset()
```
    Description copied from class: Dialect
    
    Whether the Dialect supports timezone offset 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
  - appendBooleanValueString
```
public void appendBooleanValueString(SqlAppender appender,
                                     boolean bool)
```
    Overrides:
    
    appendBooleanValueString in class Dialect
  - getLimitHandler
```
public LimitHandler getLimitHandler()
```
    Description copied from class: Dialect
    
    Returns a LimitHandler that implements support for Query.setMaxResults(int) and Query.setFirstResult(int) for this dialect.
    
    Overrides:
    
    getLimitHandler in class Dialect
  - supportsDistinctFromPredicate
```
public boolean supportsDistinctFromPredicate()
```
    Description copied from class: Dialect
    
    Is this SQL dialect known to support some kind of distinct from predicate.
    Basically, 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
  - supportsIfExistsAfterTableName
```
public boolean supportsIfExistsAfterTableName()
```
    Description copied from class: Dialect
    
    For dropping a table, can the phrase "if exists" be applied after the table name?
    NOTE : Only one or the other (or neither) of this and Dialect.supportsIfExistsBeforeTableName() should return true
    
    Overrides:
    
    supportsIfExistsAfterTableName in class Dialect
    
    Returns:
    
    true if the "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?
    NOTE : Only one or the other (or neither) of this and Dialect.supportsIfExistsAfterTableName() should return true
    
    Overrides:
    
    supportsIfExistsBeforeTableName in class Dialect
    
    Returns:
    
    true if the "if exists" can be applied before the table name
  - 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 the "if exists" can be applied after ALTER TABLE
  - supportsIfExistsBeforeConstraintName
```
public boolean supportsIfExistsBeforeConstraintName()
```
    Description copied from class: Dialect
    
    For dropping a constraint with an "alter table", can the phrase "if exists" be applied before the constraint name?
    NOTE : Only one or the other (or neither) of this and Dialect.supportsIfExistsAfterConstraintName() should return true
    
    Overrides:
    
    supportsIfExistsBeforeConstraintName in class Dialect
    
    Returns:
    
    true if the "if exists" can be applied before the constraint name
  - 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
  - supportsCommentOn
```
public boolean supportsCommentOn()
```
    Description copied from class: Dialect
    
    Does this dialect/database support commenting on tables, columns, etc?
    
    Overrides:
    
    supportsCommentOn in class Dialect
    
    Returns:
    
    true if commenting is supported
  - 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.
  - getSequenceSupport
```
public SequenceSupport getSequenceSupport()
```
    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 source of SequenceInformation.
    
    Overrides:
    
    getSequenceInformationExtractor in class Dialect
  - getNullOrdering
```
public NullOrdering getNullOrdering()
```
    Description copied from class: Dialect
    
    Returns the ordering of null.
    
    Overrides:
    
    getNullOrdering in class Dialect
  - getFallbackSqmMutationStrategy
```
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(EntityMappingType entityDescriptor,
                                                                    RuntimeModelCreationContext runtimeModelCreationContext)
```
    Overrides:
    
    getFallbackSqmMutationStrategy in class Dialect
  - getFallbackSqmInsertStrategy
```
public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(EntityMappingType entityDescriptor,
                                                                RuntimeModelCreationContext runtimeModelCreationContext)
```
    Overrides:
    
    getFallbackSqmInsertStrategy in class Dialect
  - getSupportedTemporaryTableKind
```
public TemporaryTableKind getSupportedTemporaryTableKind()
```
    Overrides:
    
    getSupportedTemporaryTableKind in class Dialect
  - getTemporaryTableBeforeUseAction
```
public org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction getTemporaryTableBeforeUseAction()
```
    Overrides:
    
    getTemporaryTableBeforeUseAction in class Dialect
  - getViolatedConstraintNameExtractor
```
public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor()
```
    Specified by:
    
    getViolatedConstraintNameExtractor in interface ConversionContext
    
    Overrides:
    
    getViolatedConstraintNameExtractor in class Dialect
  - buildSQLExceptionConversionDelegate
```
public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate()
```
    Description copied from class: Dialect
    Build an instance of a 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:
    
    a "static" delegate based on the JDBC 4 defined SQLException hierarchy;
    
    a delegate that interprets SQLState codes for either X/Open or SQL-2003 codes, depending on java.sql.DatabaseMetaData#getSQLStateType
    
    It is strongly recommended that specific Dialect implementations override this method, since interpretation of a SQL error is much more accurate when based on the vendor-specific ErrorCode rather than the SQLState.
    Specific Dialects may override to return whatever is most appropriate for that vendor.
    Overrides:
    
    buildSQLExceptionConversionDelegate in class Dialect
    
    Returns:
    
    The SQLExceptionConversionDelegate for this dialect
  - supportsCurrentTimestampSelection
```
public boolean supportsCurrentTimestampSelection()
```
    Description copied from class: Dialect
    
    Does this dialect support a way to retrieve the database's current timestamp value?
    
    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
    
    Should the value returned by Dialect.getCurrentTimestampSelectString() be treated as callable. Typically this indicates that JDBC escape syntax is being used...
    
    Overrides:
    
    isCurrentTimestampSelectStringCallable in class Dialect
    
    Returns:
    
    True if the Dialect.getCurrentTimestampSelectString() return is callable; false otherwise.
  - getCurrentTimestampSelectString
```
public String getCurrentTimestampSelectString()
```
    Description copied from class: Dialect
    
    Retrieve the command used to retrieve the current timestamp from the database.
    
    Overrides:
    
    getCurrentTimestampSelectString in class Dialect
    
    Returns:
    
    The command.
  - 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).
    NOTE : I do not know the correct answer currently for databases which (1) are not part of the cruise control process or (2) do not Dialect.supportsExpectedLobUsagePattern().
    
    Overrides:
    
    supportsLobValueChangePropagation in class Dialect
    
    Returns:
    
    True if the changes are propagated back to the database; false otherwise.
  - 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.
  - requiresParensForTupleDistinctCounts
```
public boolean requiresParensForTupleDistinctCounts()
```
    Description copied from class: Dialect
    
    If Dialect.supportsTupleDistinctCounts() is true, does the Dialect require the tuple to be wrapped with parens?
    
    Overrides:
    
    requiresParensForTupleDistinctCounts in class Dialect
    
    Returns:
    
    boolean
  - 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.
  - getGroupBySelectItemReferenceStrategy
```
public SelectItemReferenceStrategy getGroupBySelectItemReferenceStrategy()
```
    Overrides:
    
    getGroupBySelectItemReferenceStrategy in class Dialect
  - supportsOffsetInSubquery
```
public boolean supportsOffsetInSubquery()
```
    Description copied from class: Dialect
    
    Does this dialect support offset in subqueries? Ex: select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1 offset 1)
    
    Overrides:
    
    supportsOffsetInSubquery in class Dialect
    
    Returns:
    
    boolean
  - 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.
  - 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.
  - getIdentityColumnSupport
```
public IdentityColumnSupport getIdentityColumnSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate IdentityColumnSupport
    
    Overrides:
    
    getIdentityColumnSupport in class Dialect
    
    Returns:
    
    the IdentityColumnSupport
  - registerResultSetOutParameter
```
public int registerResultSetOutParameter(CallableStatement statement,
                                         int position)
                                  throws SQLException
```
    Description copied from class: Dialect
    
    Registers a parameter (either OUT, or the new REF_CURSOR param type available in Java 8) capable of returning ResultSet *by position*. Pre-Java 8, registering such ResultSet-returning parameters varied greatly across database and drivers; hence its inclusion as part of the Dialect contract.
    
    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.
  - getQueryHintString
```
public String getQueryHintString(String query,
                                 String hints)
```
    Description copied from class: Dialect
    
    Apply a hint to the query. The entire query is provided, allowing the Dialect 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
  - 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 all of the 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
  - generatedAs
```
public String generatedAs(String generatedAs)
```
    Overrides:
    
    generatedAs in class Dialect

Constructor	Description
`H2Dialect()`
`H2Dialect(DatabaseVersion version)`
`H2Dialect(DialectResolutionInfo info)`

Class H2Dialect

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

H2Dialect

H2Dialect

H2Dialect

Method Detail

getDefaultNonContextualLobCreation

supportsStandardArrays

columnType

castType

registerColumnTypes

contributeTypes

getDefaultStatementBatchSize

hasOddDstBehavior

initializeFunctionRegistry

augmentPhysicalTableTypes

resolveSqlTypeCode

resolveSqlTypeDescriptor

resolveSqlTypeCode

getMaxVarcharLength

currentTime

currentTimestamp

currentTimestampWithTimeZone

getSqlAstTranslatorFactory

extractPattern

timestampaddPattern

timestampdiffPattern

supportsTemporalLiteralOffset

getTimeZoneSupport

appendBooleanValueString

getLimitHandler

supportsDistinctFromPredicate

supportsIfExistsAfterTableName

supportsIfExistsBeforeTableName

supportsIfExistsAfterAlterTable

supportsIfExistsBeforeConstraintName

getCascadeConstraintsString

supportsCommentOn

dropConstraints

getSequenceSupport

getQuerySequencesString

getSequenceInformationExtractor

getNullOrdering

getFallbackSqmMutationStrategy

getFallbackSqmInsertStrategy

getSupportedTemporaryTableKind

getTemporaryTableBeforeUseAction

getViolatedConstraintNameExtractor

buildSQLExceptionConversionDelegate

supportsCurrentTimestampSelection

isCurrentTimestampSelectStringCallable

getCurrentTimestampSelectString

supportsLobValueChangePropagation

supportsTupleCounts

requiresParensForTupleDistinctCounts

doesReadCommittedCauseWritersToBlockReaders

getGroupBySelectItemReferenceStrategy

supportsOffsetInSubquery

supportsWindowFunctions

supportsFetchClause

getIdentityColumnSupport

registerResultSetOutParameter

getQueryHintString

appendDatetimeFormat

translateExtractField

generatedAs