java.lang.Object
- org.hibernate.dialect.Dialect
- - org.hibernate.dialect.DB2Dialect

All Implemented Interfaces:

ConversionContext

Direct Known Subclasses:

DB2390Dialect, DB2400Dialect, DB297Dialect, DB2iDialect, DB2SpatialDialect, DB2zDialect
```
public class DB2Dialect
extends Dialect
```
A SQL dialect for DB2 for LUW (Linux, Unix, and Windows) version 10.5 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_DEFAULT_BATCH_LOAD_SIZING_STRATEGY, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors
Constructor Description

DB2Dialect()

DB2Dialect(DatabaseVersion version)

DB2Dialect(DialectResolutionInfo info)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`appendBinaryLiteral(SqlAppender appender, byte[] bytes)`
`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).
`IdentifierHelper`	`buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)`	Build the IdentifierHelper indicated by this Dialect for handling identifier conversions.
`SQLExceptionConversionDelegate`	`buildSQLExceptionConversionDelegate()`	Build an instance of a `SQLExceptionConversionDelegate` for interpreting dialect-specific error or SQLState codes.
`boolean`	`canDisableConstraints()`	Is there some way to disable foreign key constraint checking while truncating tables? (If there's no way to do it, and if we can't batch truncate, we must drop and recreate the constraints instead.)
`protected String`	`columnType(int sqlTypeCode)`	The database 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
`protected UniqueDelegate`	`createUniqueDelegate()`
`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)`	Obtain a pattern for the SQL equivalent to an `extract()` function call.
`String`	`generatedAs(String generatedAs)`	The `generated as` clause, or similar, for generated column declarations in DDL statements.
`AggregateSupport`	`getAggregateSupport()`	How the Dialect supports aggregate types like `SqlTypes.STRUCT`.
`String`	`getAlterColumnTypeString(String columnName, String columnType, String columnDefinition)`
`CallableStatementSupport`	`getCallableStatementSupport()`
`String`	`getCreateIndexTail(boolean unique, List<Column> columns)`
`String`	`getCreateUserDefinedTypeExtensionsString()`
`String`	`getCurrentTimestampSelectString()`	Retrieve the command used to retrieve the current timestamp from the database.
`DatabaseVersion`	`getDB2Version()`	DB2 LUW Version
`int`	`getDefaultDecimalPrecision()`	This is the default precision for a generated column mapped to a `BigInteger` or `BigDecimal`.
`int`	`getDefaultStatementBatchSize()`	The default value to use for the configuration property "hibernate.jdbc.batch_size".
`String`	`getDisableConstraintStatement(String tableName, String name)`	A SQL statement that temporarily disables checking of the given foreign key constraint.
`String[]`	`getDropSchemaCommand(String schemaName)`	Get the SQL command used to drop the named schema
`String`	`getEnableConstraintStatement(String tableName, String name)`	A SQL statement that re-enables checking of the given foreign key constraint.
`SqmMultiTableInsertStrategy`	`getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`
`SqmMultiTableMutationStrategy`	`getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`
`String`	`getForUpdateSkipLockedString()`	Retrieves the `FOR UPDATE SKIP LOCKED` syntax specific to this dialect.
`String`	`getForUpdateSkipLockedString(String aliases)`	Get the `FOR UPDATE OF column_list SKIP LOCKED` fragment appropriate for this dialect given the aliases of the columns to be write locked.
`String`	`getForUpdateString()`	Get the string to append to SELECT statements to acquire locks for this dialect.
`long`	`getFractionalSecondPrecisionInNanos()`	Since we're using `seconds_between()` and `add_seconds()`, it makes sense to use seconds as the "native" precision.
`IdentityColumnSupport`	`getIdentityColumnSupport()`	Get the appropriate `IdentityColumnSupport`
`int`	`getInExpressionCountLimit()`	Return the limit that the underlying database places on the number of elements in an `IN` predicate.
`LimitHandler`	`getLimitHandler()`	Returns a `LimitHandler` that implements support for `Query.setMaxResults(int)` and `Query.setFirstResult(int)` for this dialect.
`int`	`getMaxIdentifierLength()`	What is the maximum identifier length supported by the dialect?
`int`	`getMaxVarcharLength()`	The biggest size value that can be supplied as argument to a `Types.VARCHAR`-like type.
`protected DatabaseVersion`	`getMinimumSupportedVersion()`
`String`	`getQuerySequencesString()`	Get the select command used retrieve the names of all sequences.
`String`	`getReadLockString(int timeout)`	Get the string to append to SELECT statements to acquire READ locks for this dialect.
`ResultSet`	`getResultSet(CallableStatement ps)`	Given a callable statement previously processed by `Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int)`, extract the `ResultSet` from the OUT parameter.
`String`	`getSelectClauseNullString(int sqlType, TypeConfiguration typeConfiguration)`	Given a `Types` type code, determine an appropriate null value to use in a select clause.
`SequenceInformationExtractor`	`getSequenceInformationExtractor()`	A source of `SequenceInformation`.
`SequenceSupport`	`getSequenceSupport()`
`SqlAstTranslatorFactory`	`getSqlAstTranslatorFactory()`	Return a `SqlAstTranslatorFactory` specific to this dialect.
`String`	`getTruncateTableStatement(String tableName)`	A SQL statement that truncates the given table.
`UniqueDelegate`	`getUniqueDelegate()`	Get the `UniqueDelegate` supported by this dialect
`String`	`getWriteLockString(int timeout)`	Get the string to append to SELECT statements to acquire WRITE locks for this dialect.
`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()`.
`protected void`	`registerDefaultKeywords()`
`int`	`registerResultSetOutParameter(CallableStatement statement, int col)`	Registers a parameter (either OUT, or the new REF_CURSOR param type available in Java 8) capable of returning `ResultSet` by position.
`boolean`	`requiresCastForConcatenatingNonStrings()`	Does this dialect/database require casting of non-string arguments in a concat function?
`static String`	`selectNullString(int sqlType)`
`boolean`	`supportsAlterColumnType()`
`boolean`	`supportsCommentOn()`	Does this dialect support commenting on tables and columns?
`boolean`	`supportsCurrentTimestampSelection()`	Does this dialect support a way to retrieve the database's current timestamp value?
`boolean`	`supportsDistinctFromPredicate()`	Does this dialect support some kind of `distinct from` predicate?
`boolean`	`supportsExistsInSelect()`	Does the dialect support an exists statement in the select clause?
`boolean`	`supportsInsertReturning()`	Does this dialect fully support returning arbitrary generated column values after execution of an `insert` statement, using native SQL syntax?
`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()`	Informational metadata about whether this dialect is known to support specifying timeouts for requested lock acquisitions.
`boolean`	`supportsNonQueryWithCTE()`	Does this dialect support insert, update, and delete statements with Common Table Expressions?
`boolean`	`supportsNullPrecedence()`
`boolean`	`supportsOffsetInSubquery()`	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)`
`boolean`	`supportsOuterJoinForUpdate()`	Does this dialect support `FOR UPDATE` in conjunction with outer joined rows?
`boolean`	`supportsParametersInInsertSelect()`	Does this dialect support parameters within the `SELECT` clause of `INSERT ... SELECT ...` statements?
`boolean`	`supportsPartitionBy()`	Does the underlying database support partition by?
`protected boolean`	`supportsPredicateAsExpression()`	Whether a predicate like `a > 0` can appear in an expression context e.g.
`boolean`	`supportsRecursiveCTE()`	Does this dialect/database support recursive CTEs (Common Table Expressions)?
`boolean`	`supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()`	Does this dialect support asking the result set its positioning information on forward only cursors.
`boolean`	`supportsSkipLocked()`	Does this dialect support `SKIP_LOCKED` timeout.
`boolean`	`supportsTupleDistinctCounts()`	Does this dialect support `count(distinct a,b)`?
`boolean`	`supportsValuesList()`	Does this dialect support `values` lists of form `VALUES (1), (2), (3)`?
`boolean`	`supportsWindowFunctions()`	Does this dialect support window functions like `row_number() over (..)`?
`String`	`timestampaddPattern(TemporalUnit unit, jakarta.persistence.TemporalType temporalType, IntervalType intervalType)`	Obtain a pattern for the SQL equivalent to a `timestampadd()` function call.
`String`	`timestampdiffPattern(TemporalUnit unit, jakarta.persistence.TemporalType fromTemporalType, jakarta.persistence.TemporalType toTemporalType)`	Obtain a pattern for the SQL equivalent to a `timestampdiff()` function call.
`static String`	`timestampdiffPatternV10(TemporalUnit unit, jakarta.persistence.TemporalType fromTemporalType, jakarta.persistence.TemporalType toTemporalType)`
`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, appendDateTimeLiteral, appendDateTimeLiteral, appendDateTimeLiteral, appendIntervalLiteral, appendLiteral, appendLockHint, appendUUIDLiteral, applyLocksToSql, augmentPhysicalTableTypes, augmentRecognizedTableTypes, canBatchTruncate, canCreateCatalog, canCreateSchema, castPattern, castType, checkVersion, closeQuote, createUpsertOperation, currentDate, currentLocalTime, currentLocalTimestamp, currentTime, currentTimestamp, currentTimestampWithTimeZone, defaultScrollMode, doesRepeatableReadCauseReadersToBlockWriters, equivalentTypes, escapeComment, forceLobAsLastValue, getAddColumnString, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAlterTableString, getArrayTypeName, getAuxiliaryDatabaseObjectExporter, getCascadeConstraintsString, getCaseInsensitiveLike, getCheckCondition, getCheckCondition, getColumnAliasExtractor, getColumnComment, getCreateCatalogCommand, getCreateIndexString, getCreateMultisetTableString, getCreateSchemaCommand, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCreateUserDefinedTypeKindString, getCurrentSchemaCommand, getDefaultBatchLoadSizingStrategy, getDefaultLobLength, getDefaultNonContextualLobCreation, getDefaultProperties, getDefaultTimestampPrecision, getDefaultUseGetGeneratedKeys, getDisableConstraintsStatement, getDoublePrecision, getDropCatalogCommand, getDropForeignKeyString, getDropTableString, getDropUniqueKeyString, getEnableConstraintsStatement, getEnumTypeDeclaration, getFallbackSchemaManagementTool, getFloatPrecision, getForeignKeyExporter, getForUpdateNowaitString, getForUpdateNowaitString, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getGroupBySelectItemReferenceStrategy, getHqlTranslator, getIndexExporter, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxAliasLength, getMaxNVarcharCapacity, getMaxNVarcharLength, getMaxVarbinaryCapacity, getMaxVarbinaryLength, getMaxVarcharCapacity, getNameQualifierSupport, getNationalizationSupport, getNativeIdentifierGeneratorStrategy, getNoColumnsInsertString, getNullColumnString, getNullColumnString, getNullOrdering, getPreferredSqlTypeCodeForArray, getPreferredSqlTypeCodeForBoolean, getQueryHintString, getQueryHintString, getReadLockString, getReadRowLockStrategy, getResultSet, getResultSet, getSchemaNameResolver, getSelectGUIDString, getSequenceExporter, getSizeStrategy, getSqmTranslatorFactory, getSupportedTemporaryTableKind, getTableCleaner, getTableComment, getTableExporter, getTableMigrator, getTableTypeString, getTemporaryTableAfterUseAction, getTemporaryTableBeforeUseAction, getTemporaryTableCreateCommand, getTemporaryTableCreateOptions, getTemporaryTableDdlTransactionHandling, getTemporaryTableDropCommand, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getTimeZoneSupport, getTruncateTableStatements, getUniqueKeyExporter, getUserDefinedTypeComment, getUserDefinedTypeExporter, getVersion, getViolatedConstraintNameExtractor, getWriteLockString, getWriteRowLockStrategy, hasAlterTable, hasDataTypeBeforeGeneratedAs, hasSelfReferentialForeignKeyBug, initDefaultProperties, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isJdbcLogWarningsEnabledByDefault, isLockTimeoutParameterized, openQuote, prependComment, qualifyIndexName, quote, registerKeyword, registerKeywords, registerResultSetOutParameter, requiresFloatCastingOfIntegerDivision, requiresParensForTupleCounts, requiresParensForTupleDistinctCounts, resolveSqlTypeCode, resolveSqlTypeCode, resolveSqlTypeDescriptor, resolveSqlTypeLength, supportsBindAsCallableArgument, supportsBitType, supportsCascadeDelete, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsColumnCheck, supportsExpectedLobUsagePattern, supportsFetchClause, supportsFractionalTimestampArithmetic, supportsIfExistsAfterAlterTable, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTableName, supportsIfExistsAfterTypeName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTableName, supportsIfExistsBeforeTypeName, supportsInsertReturningGeneratedKeys, supportsJdbcConnectionLobCreation, supportsMaterializedLobAccess, supportsNamedParameters, supportsNoColumnsInsert, supportsNoWait, supportsOrderByInSubquery, supportsOrdinalSelectItemReference, supportsStandardArrays, supportsStandardCurrentTimestampFunction, supportsSubqueryInSelect, supportsSubqueryOnMutatingTable, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporalLiteralOffset, supportsTemporaryTablePrimaryKey, supportsTemporaryTables, supportsTruncateWithCast, supportsTupleCounts, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnionInSubquery, supportsValuesListForInsert, supportsWait, 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
  - DB2Dialect
```
public DB2Dialect()
```
  - DB2Dialect
```
public DB2Dialect(DialectResolutionInfo info)
```
  - DB2Dialect
```
public DB2Dialect(DatabaseVersion version)
```
- Method Detail
  - getMinimumSupportedVersion
```
protected DatabaseVersion getMinimumSupportedVersion()
```
    Overrides:
    
    getMinimumSupportedVersion in class Dialect
  - registerDefaultKeywords
```
protected void registerDefaultKeywords()
```
    Overrides:
    
    registerDefaultKeywords in class Dialect
  - getDB2Version
```
public DatabaseVersion getDB2Version()
```
    DB2 LUW Version
  - 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
  - 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
  - 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
  - createUniqueDelegate
```
protected UniqueDelegate createUniqueDelegate()
```
  - getMaxVarcharLength
```
public int getMaxVarcharLength()
```
    Description copied from class: Dialect
    
    The biggest size value that can be supplied as argument to a Types.VARCHAR-like type. For longer column lengths, use some sort of text-like type for the column.
    
    Overrides:
    
    getMaxVarcharLength in class Dialect
  - getDefaultDecimalPrecision
```
public int getDefaultDecimalPrecision()
```
    Description copied from class: Dialect
    
    This is the default precision for a generated column mapped to a BigInteger or BigDecimal.
    Usually returns the maximum precision of the database, except when there is no such maximum precision, or the maximum precision is very high.
    
    Overrides:
    
    getDefaultDecimalPrecision in class Dialect
    
    Returns:
    
    the default precision, in decimal digits
  - supportsPredicateAsExpression
```
protected boolean supportsPredicateAsExpression()
```
    Description copied from class: Dialect
    
    Whether a predicate like `a > 0` can appear in an expression context e.g. a select item list.
    
    Overrides:
    
    supportsPredicateAsExpression in class Dialect
  - supportsDistinctFromPredicate
```
public boolean supportsDistinctFromPredicate()
```
    Description copied from class: Dialect
    
    Does this dialect support some kind of distinct from predicate?
    This 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
  - 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
    
    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
  - getDropSchemaCommand
```
public String[] getDropSchemaCommand(String schemaName)
```
    Description copied from class: Dialect
    
    Get the SQL command used to drop the named schema
    
    Overrides:
    
    getDropSchemaCommand in class Dialect
    
    Parameters:
    
    schemaName - The name of the schema to be dropped.
    
    Returns:
    
    The drop commands
  - getFractionalSecondPrecisionInNanos
```
public long getFractionalSecondPrecisionInNanos()
```
    Since we're using seconds_between() and add_seconds(), it makes sense to use seconds as the "native" precision.
    
    Overrides:
    
    getFractionalSecondPrecisionInNanos in class Dialect
    
    Returns:
    
    the precision, specified as a quantity of nanoseconds
    
    See Also:
    
    TemporalUnit.NATIVE
  - timestampdiffPattern
```
public String timestampdiffPattern(TemporalUnit unit,
                                   jakarta.persistence.TemporalType fromTemporalType,
                                   jakarta.persistence.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
  - timestampdiffPatternV10
```
public static String timestampdiffPatternV10(TemporalUnit unit,
                                             jakarta.persistence.TemporalType fromTemporalType,
                                             jakarta.persistence.TemporalType toTemporalType)
```
  - timestampaddPattern
```
public String timestampaddPattern(TemporalUnit unit,
                                  jakarta.persistence.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
  - 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.
  - getCreateIndexTail
```
public String getCreateIndexTail(boolean unique,
                                 List<Column> columns)
```
    Overrides:
    
    getCreateIndexTail in class Dialect
  - 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
  - getForUpdateString
```
public String getForUpdateString()
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire locks for this dialect.
    
    Overrides:
    
    getForUpdateString in class Dialect
    
    Returns:
    
    The appropriate FOR UPDATE clause string.
  - supportsSkipLocked
```
public boolean supportsSkipLocked()
```
    Description copied from class: Dialect
    
    Does this dialect support SKIP_LOCKED timeout.
    
    Overrides:
    
    supportsSkipLocked in class Dialect
    
    Returns:
    
    true if SKIP_LOCKED is supported
  - getForUpdateSkipLockedString
```
public String getForUpdateSkipLockedString()
```
    Description copied from class: Dialect
    
    Retrieves the FOR UPDATE SKIP LOCKED syntax specific to this dialect.
    
    Overrides:
    
    getForUpdateSkipLockedString in class Dialect
    
    Returns:
    
    The appropriate FOR UPDATE SKIP LOCKED clause string.
  - getForUpdateSkipLockedString
```
public String getForUpdateSkipLockedString(String aliases)
```
    Description copied from class: Dialect
    
    Get the FOR UPDATE OF column_list SKIP LOCKED fragment appropriate for this dialect given the aliases of the columns to be write locked.
    
    Overrides:
    
    getForUpdateSkipLockedString in class Dialect
    
    Parameters:
    
    aliases - The columns to be write locked.
    
    Returns:
    
    The appropriate FOR UPDATE colunm_list SKIP LOCKED clause string.
  - getWriteLockString
```
public String getWriteLockString(int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire WRITE locks for this dialect. Location of the returned string is treated the same as getForUpdateString.
    
    Overrides:
    
    getWriteLockString in class Dialect
    
    Parameters:
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - getReadLockString
```
public String getReadLockString(int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire READ locks for this dialect. Location of the returned string is treated the same as getForUpdateString.
    
    Overrides:
    
    getReadLockString in class Dialect
    
    Parameters:
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - supportsOuterJoinForUpdate
```
public boolean supportsOuterJoinForUpdate()
```
    Description copied from class: Dialect
    
    Does this dialect support FOR UPDATE in conjunction with outer joined rows?
    
    Overrides:
    
    supportsOuterJoinForUpdate in class Dialect
    
    Returns:
    
    True if outer joined rows can be locked via FOR UPDATE.
  - supportsExistsInSelect
```
public boolean supportsExistsInSelect()
```
    Description copied from class: Dialect
    
    Does the dialect support an exists statement in the select clause?
    
    Overrides:
    
    supportsExistsInSelect in class Dialect
    
    Returns:
    
    True if exists checks are allowed in the select clause; false otherwise.
  - supportsLockTimeouts
```
public boolean supportsLockTimeouts()
```
    Description copied from class: Dialect
    
    Informational metadata about whether this dialect is known to support specifying timeouts for requested lock acquisitions.
    
    Overrides:
    
    supportsLockTimeouts in class Dialect
    
    Returns:
    
    True is this dialect supports specifying lock timeouts.
  - requiresCastForConcatenatingNonStrings
```
public boolean requiresCastForConcatenatingNonStrings()
```
    Description copied from class: Dialect
    
    Does this dialect/database require casting of non-string arguments in a concat function?
    
    Overrides:
    
    requiresCastForConcatenatingNonStrings in class Dialect
    
    Returns:
    
    true if casting of non-string arguments in concat is required
  - getSelectClauseNullString
```
public String getSelectClauseNullString(int sqlType,
                                        TypeConfiguration typeConfiguration)
```
    Description copied from class: Dialect
    
    Given a Types type code, determine an appropriate null value to use in a select clause.
    One thing to consider here is that certain databases might require proper casting for the nulls here since the select here will be part of a UNION/UNION ALL.
    
    Overrides:
    
    getSelectClauseNullString in class Dialect
    
    Parameters:
    
    sqlType - The Types type code.
    
    typeConfiguration - The type configuration
    
    Returns:
    
    The appropriate select clause value fragment.
  - selectNullString
```
public static String selectNullString(int sqlType)
```
  - registerResultSetOutParameter
```
public int registerResultSetOutParameter(CallableStatement statement,
                                         int col)
                                  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.
    
    col - 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.
  - getResultSet
```
public ResultSet getResultSet(CallableStatement ps)
                       throws SQLException
```
    Description copied from class: Dialect
    
    Given a callable statement previously processed by Dialect.registerResultSetOutParameter(java.sql.CallableStatement, int), extract the ResultSet from the OUT parameter.
    
    Overrides:
    
    getResultSet in class Dialect
    
    Parameters:
    
    ps - The callable statement.
    
    Returns:
    
    The extracted result set.
    
    Throws:
    
    SQLException - Indicates problems extracting the result set.
  - 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
  - getAlterColumnTypeString
```
public String getAlterColumnTypeString(String columnName,
                                       String columnType,
                                       String columnDefinition)
```
    Overrides:
    
    getAlterColumnTypeString in class Dialect
  - supportsAlterColumnType
```
public boolean supportsAlterColumnType()
```
    Overrides:
    
    supportsAlterColumnType in class Dialect
  - getFallbackSqmMutationStrategy
```
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor,
                                                                    RuntimeModelCreationContext runtimeModelCreationContext)
```
    Overrides:
    
    getFallbackSqmMutationStrategy in class Dialect
  - getFallbackSqmInsertStrategy
```
public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor,
                                                                RuntimeModelCreationContext runtimeModelCreationContext)
```
    Overrides:
    
    getFallbackSqmInsertStrategy in class 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.
  - 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.
  - 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.
  - supportsParametersInInsertSelect
```
public boolean supportsParametersInInsertSelect()
```
    Description copied from class: Dialect
    
    Does this dialect support parameters within the SELECT clause of INSERT ... SELECT ... statements?
    
    Overrides:
    
    supportsParametersInInsertSelect in class Dialect
    
    Returns:
    
    True if this is supported; false otherwise.
  - supportsResultSetPositionQueryMethodsOnForwardOnlyCursor
```
public boolean supportsResultSetPositionQueryMethodsOnForwardOnlyCursor()
```
    Description copied from class: Dialect
    
    Does this dialect support asking the result set its positioning information on forward only cursors. Specifically, in the case of scrolling fetches, Hibernate needs to use ResultSet.isAfterLast() and ResultSet.isBeforeFirst(). Certain drivers do not allow access to these methods for forward only cursors.
    NOTE : this is highly driver dependent!
    
    Overrides:
    
    supportsResultSetPositionQueryMethodsOnForwardOnlyCursor in class Dialect
    
    Returns:
    
    True if methods like ResultSet.isAfterLast() and ResultSet.isBeforeFirst() are supported for forward only cursors; 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).
    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.
  - 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.
  - 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.
  - 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
  - getAggregateSupport
```
public AggregateSupport getAggregateSupport()
```
    Description copied from class: Dialect
    
    How the Dialect supports aggregate types like SqlTypes.STRUCT.
    
    Overrides:
    
    getAggregateSupport in class Dialect
  - getCallableStatementSupport
```
public CallableStatementSupport getCallableStatementSupport()
```
    Overrides:
    
    getCallableStatementSupport in class Dialect
  - appendBinaryLiteral
```
public void appendBinaryLiteral(SqlAppender appender,
                                byte[] bytes)
```
    Overrides:
    
    appendBinaryLiteral 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
  - getUniqueDelegate
```
public UniqueDelegate getUniqueDelegate()
```
    Description copied from class: Dialect
    
    Get the UniqueDelegate supported by this dialect
    
    Overrides:
    
    getUniqueDelegate in class Dialect
    
    Returns:
    
    The UniqueDelegate
  - getMaxIdentifierLength
```
public int getMaxIdentifierLength()
```
    Description copied from class: Dialect
    
    What is the maximum identifier length supported by the dialect?
    
    Overrides:
    
    getMaxIdentifierLength in class Dialect
    
    Returns:
    
    The maximum length.
  - 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
  - supportsNullPrecedence
```
public boolean supportsNullPrecedence()
```
    Overrides:
    
    supportsNullPrecedence in class Dialect
  - getSqlAstTranslatorFactory
```
public SqlAstTranslatorFactory getSqlAstTranslatorFactory()
```
    Description copied from class: Dialect
    
    Return a SqlAstTranslatorFactory specific to this dialect. Return null to use Hibernate's standard translator.
    
    Overrides:
    
    getSqlAstTranslatorFactory in class Dialect
    
    See Also:
    
    StandardSqlAstTranslatorFactory, JdbcEnvironment.getSqlAstTranslatorFactory()
  - getIdentityColumnSupport
```
public IdentityColumnSupport getIdentityColumnSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate IdentityColumnSupport
    
    Overrides:
    
    getIdentityColumnSupport in class Dialect
    
    Returns:
    
    the IdentityColumnSupport
  - supportsInsertReturning
```
public boolean supportsInsertReturning()
```
    Description copied from class: Dialect
    Does this dialect fully support returning arbitrary generated column values after execution of an insert statement, using native SQL syntax?
    Support for identity columns is insufficient here, we require something like:
    
    insert ... returning ...
    select from final table (insert ... )
    Overrides:
    
    supportsInsertReturning in class Dialect
    
    Returns:
    
    true because we can use select ... from new table (insert .... )
    
    See Also:
    
    OnExecutionGenerator.getGeneratedIdentifierDelegate(org.hibernate.id.PostInsertIdentityPersister), InsertReturningDelegate
  - supportsValuesList
```
public boolean supportsValuesList()
```
    Description copied from class: Dialect
    
    Does this dialect support values lists of form VALUES (1), (2), (3)?
    
    Overrides:
    
    supportsValuesList in class Dialect
    
    Returns:
    
    true if values list are supported
  - supportsPartitionBy
```
public boolean supportsPartitionBy()
```
    Description copied from class: Dialect
    
    Does the underlying database support partition by?
    
    Overrides:
    
    supportsPartitionBy in class Dialect
  - supportsNonQueryWithCTE
```
public boolean supportsNonQueryWithCTE()
```
    Description copied from class: Dialect
    
    Does this dialect support insert, update, and delete statements with Common Table Expressions?
    
    Overrides:
    
    supportsNonQueryWithCTE in class Dialect
    
    Returns:
    
    true if non-query statements are supported with CTE
  - supportsRecursiveCTE
```
public boolean supportsRecursiveCTE()
```
    Description copied from class: Dialect
    
    Does this dialect/database support recursive CTEs (Common Table Expressions)?
    
    Overrides:
    
    supportsRecursiveCTE in class Dialect
    
    Returns:
    
    true if recursive CTEs are supported
  - 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
  - supportsWindowFunctions
```
public boolean supportsWindowFunctions()
```
    Description copied from class: Dialect
    
    Does this dialect support window functions like row_number() over (..)?
    
    Overrides:
    
    supportsWindowFunctions in class Dialect
    
    Returns:
    
    true if the underlying database supports window functions, false otherwise. The default is false.
  - supportsLateral
```
public boolean supportsLateral()
```
    Description copied from class: Dialect
    
    Does this dialect support the SQL lateral keyword or a proprietary alternative?
    
    Overrides:
    
    supportsLateral in class Dialect
    
    Returns:
    
    true if the underlying database supports lateral, false otherwise. The default is false.
  - 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
  - appendBooleanValueString
```
public void appendBooleanValueString(SqlAppender appender,
                                     boolean bool)
```
    Overrides:
    
    appendBooleanValueString in class Dialect
  - extractPattern
```
public String extractPattern(TemporalUnit unit)
```
    Description copied from class: Dialect
    
    Obtain a pattern for the SQL equivalent to an extract() function call. The resulting pattern must contain ?1 and ?2 placeholders for the arguments.
    This method does not need to handle TemporalUnit.NANOSECOND, TemporalUnit.NATIVE, TemporalUnit.OFFSET, TemporalUnit.DATE, TemporalUnit.TIME, TemporalUnit.WEEK_OF_YEAR, or TemporalUnit.WEEK_OF_MONTH, which are already desugared by ExtractFunction.
    
    Overrides:
    
    extractPattern in class Dialect
    
    Parameters:
    
    unit - the first argument
  - getInExpressionCountLimit
```
public int getInExpressionCountLimit()
```
    Description copied from class: Dialect
    
    Return the limit that the underlying database places on the number of elements in an IN predicate. If the database defines no such limits, simply return zero or less-than-zero.
    
    Overrides:
    
    getInExpressionCountLimit in class Dialect
    
    Returns:
    
    int The limit, or zero-or-less to indicate no limit.
  - generatedAs
```
public String generatedAs(String generatedAs)
```
    Description copied from class: Dialect
    
    The generated as clause, or similar, for generated column declarations in DDL statements.
    
    Overrides:
    
    generatedAs in class Dialect
    
    Parameters:
    
    generatedAs - a SQL expression used to generate the column value
    
    Returns:
    
    The generated as clause containing the given expression
  - buildIdentifierHelper
```
public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder,
                                              DatabaseMetaData dbMetaData)
                                       throws SQLException
```
    Description copied from class: Dialect
    Build the IdentifierHelper indicated by this Dialect for handling identifier conversions. Returning null is allowed and indicates that Hibernate should fallback 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 semi-configured IdentifierHelper builder.
    
    dbMetaData - Access to the metadata returned from the driver if needed and if available. WARNING: 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 re-throw and Hibernate will handle.
    
    See Also:
    
    Dialect.getNameQualifierSupport()
  - canDisableConstraints
```
public boolean canDisableConstraints()
```
    Description copied from class: Dialect
    
    Is there some way to disable foreign key constraint checking while truncating tables? (If there's no way to do it, and if we can't batch truncate, we must drop and recreate the constraints instead.)
    
    Overrides:
    
    canDisableConstraints in class Dialect
    
    Returns:
    
    true if there is some way to do it
    
    See Also:
    
    Dialect.getDisableConstraintsStatement(), Dialect.getDisableConstraintStatement(String, String)
  - getDisableConstraintStatement
```
public String getDisableConstraintStatement(String tableName,
                                            String name)
```
    Description copied from class: Dialect
    
    A SQL statement that temporarily disables checking of the given foreign key constraint.
    
    Overrides:
    
    getDisableConstraintStatement in class Dialect
    
    Parameters:
    
    tableName - the name of the table
    
    name - the name of the constraint
  - getEnableConstraintStatement
```
public String getEnableConstraintStatement(String tableName,
                                           String name)
```
    Description copied from class: Dialect
    
    A SQL statement that re-enables checking of the given foreign key constraint.
    
    Overrides:
    
    getEnableConstraintStatement in class Dialect
    
    Parameters:
    
    tableName - the name of the table
    
    name - the name of the constraint
  - getTruncateTableStatement
```
public String getTruncateTableStatement(String tableName)
```
    Description copied from class: Dialect
    
    A SQL statement that truncates the given table.
    
    Overrides:
    
    getTruncateTableStatement in class Dialect
    
    Parameters:
    
    tableName - the name of the table
  - getCreateUserDefinedTypeExtensionsString
```
public String getCreateUserDefinedTypeExtensionsString()
```
    Overrides:
    
    getCreateUserDefinedTypeExtensionsString in class Dialect

Constructor	Description
`DB2Dialect()`
`DB2Dialect(DatabaseVersion version)`
`DB2Dialect(DialectResolutionInfo info)`

Class DB2Dialect

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

DB2Dialect

DB2Dialect

DB2Dialect

Method Detail

getMinimumSupportedVersion

registerDefaultKeywords

getDB2Version

getDefaultStatementBatchSize

columnType

registerColumnTypes

createUniqueDelegate

getMaxVarcharLength

getDefaultDecimalPrecision

supportsPredicateAsExpression

supportsDistinctFromPredicate

initializeFunctionRegistry

getDropSchemaCommand

getFractionalSecondPrecisionInNanos

timestampdiffPattern

timestampdiffPatternV10

timestampaddPattern

dropConstraints

getCreateIndexTail

getSequenceSupport

getQuerySequencesString

getSequenceInformationExtractor

getForUpdateString

supportsSkipLocked

getForUpdateSkipLockedString

getForUpdateSkipLockedString

getWriteLockString

getReadLockString

supportsOuterJoinForUpdate

supportsExistsInSelect

supportsLockTimeouts

requiresCastForConcatenatingNonStrings

getSelectClauseNullString

selectNullString

registerResultSetOutParameter

getResultSet

supportsCommentOn

getAlterColumnTypeString

supportsAlterColumnType

getFallbackSqmMutationStrategy

getFallbackSqmInsertStrategy

supportsCurrentTimestampSelection

getCurrentTimestampSelectString

isCurrentTimestampSelectStringCallable

supportsParametersInInsertSelect

supportsResultSetPositionQueryMethodsOnForwardOnlyCursor

supportsLobValueChangePropagation

doesReadCommittedCauseWritersToBlockReaders

supportsTupleDistinctCounts

contributeTypes

getAggregateSupport

getCallableStatementSupport

appendBinaryLiteral

buildSQLExceptionConversionDelegate

getUniqueDelegate

getMaxIdentifierLength

getLimitHandler

supportsNullPrecedence

getSqlAstTranslatorFactory

getIdentityColumnSupport

supportsInsertReturning

supportsValuesList

supportsPartitionBy

supportsNonQueryWithCTE

supportsRecursiveCTE

supportsOffsetInSubquery