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

All Implemented Interfaces:

FunctionContributor, TypeContributor, ConversionContext

Direct Known Subclasses:

MariaDBDialect, MySQL56SpatialDialect, MySQL57Dialect, MySQL5SpatialDialect, MySQL8Dialect, MySQLSpatialDialect, TiDBDialect
```
public class MySQLDialect
extends Dialect
```
A SQL dialect for MySQL 5.7 and above.

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

Field Summary
- Fields inherited from class org.hibernate.dialect.Dialect
  CLOSED_QUOTE, LEGACY_LOB_MERGE_STRATEGY, LOG_BASE2OF10, NEW_LOCATOR_LOB_MERGE_STRATEGY, QUOTE, STANDARD_MULTI_KEY_LOAD_SIZING_STRATEGY, STREAM_XFER_LOB_MERGE_STRATEGY

Constructor Summary

Constructors
Constructor	Description
`MySQLDialect()`
`MySQLDialect(DatabaseVersion version)`
`MySQLDialect(DatabaseVersion version, int bytesPerCharacter)`
`MySQLDialect(DatabaseVersion version, int bytesPerCharacter, boolean noBackslashEscapes)`
`MySQLDialect(DatabaseVersion version, MySQLServerConfiguration serverConfiguration)`
`MySQLDialect(DialectResolutionInfo info)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`appendDatetimeFormat(SqlAppender appender, String format)`	Translate the given datetime format string from the pattern language defined by Java's `DateTimeFormatter` to whatever pattern language is understood by the native datetime formatting function for this database (often the `to_char()` function).
`void`	`appendDateTimeLiteral(SqlAppender appender, TemporalAccessor temporalAccessor, TemporalType precision, TimeZone jdbcTimeZone)`	Append a datetime literal representing the given `java.time` value to the given `SqlAppender`.
`void`	`appendDateTimeLiteral(SqlAppender appender, Calendar calendar, TemporalType precision, TimeZone jdbcTimeZone)`	Append a datetime literal representing the given `Calendar` value to the given `SqlAppender`.
`void`	`appendDateTimeLiteral(SqlAppender appender, Date date, TemporalType precision, TimeZone jdbcTimeZone)`	Append a datetime literal representing the given `Date` value to the given `SqlAppender`.
`void`	`appendLiteral(SqlAppender appender, String literal)`	Append a literal string to the given `SqlAppender`.
`IdentifierHelper`	`buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)`	The `IdentifierHelper` indicated by this dialect for handling identifier conversions.
`SQLExceptionConversionDelegate`	`buildSQLExceptionConversionDelegate()`	An instance of `SQLExceptionConversionDelegate` for interpreting dialect-specific error or SQLState codes.
`boolean`	`canCreateCatalog()`	Does this dialect support creating and dropping catalogs?
`boolean`	`canCreateSchema()`	Does this dialect support creating and dropping schema?
`boolean`	`canDisableConstraints()`	Is there some way to disable foreign key constraint checking while truncating tables? (If there's no way to do it, and if we can't batch truncate, we must drop and recreate the constraints instead.)
`String`	`castPattern(CastType from, CastType to)`	Obtain a pattern for the SQL equivalent to a `cast()` function call.
`protected String`	`castType(int sqlTypeCode)`	The SQL type to use in `cast( ... as ... )` expressions when casting to the target type represented by the given JDBC type code.
`char`	`closeQuote()`	The character specific to this dialect used to close a quoted identifier.
`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)`	A callback which allows the `Dialect` to contribute types.
`protected static DatabaseVersion`	`createVersion(DialectResolutionInfo info)`
`String`	`currentTimestamp()`	MySQL 5.7 precision defaults to seconds, but microseconds is better
`static Replacer`	`datetimeFormat(String format)`
`boolean`	`dropConstraints()`	Do we need to drop constraints before dropping tables in this dialect?
`String`	`extractPattern(TemporalUnit unit)`	MySQL supports a limited list of temporal fields in the extract() function, but we can emulate some of them by using the appropriate named functions instead of extract().
`String`	`getAddForeignKeyConstraintString(String constraintName, String[] foreignKey, String referencedTable, String[] primaryKey, boolean referencesPrimaryKey)`	The syntax used to add a foreign key constraint to a table, with the referenced key columns explicitly specified.
`String`	`getAlterColumnTypeString(String columnName, String columnType, String columnDefinition)`	The fragment of an `alter table` command which modifies a column type, or null if column types cannot be modified.
`protected static int`	`getCharacterSetBytesPerCharacter(DatabaseMetaData databaseMetaData)`	Deprecated.
`String`	`getColumnComment(String comment)`	Get the comment into a form supported for column definition.
`String[]`	`getCreateCatalogCommand(String catalogName)`	Get the SQL command used to create the named catalog.
`String[]`	`getCreateSchemaCommand(String schemaName)`	Get the SQL command used to create the named schema.
`String`	`getCurrentTimestampSelectString()`	The command used to retrieve the current timestamp from the database.
`long`	`getDefaultLobLength()`	The default length for a LOB column, if LOB columns have a length in this dialect.
`protected MySQLStorageEngine`	`getDefaultMySQLStorageEngine()`
`String`	`getDisableConstraintsStatement()`	A SQL statement that temporarily disables foreign key constraint checking for all tables.
`String[]`	`getDropCatalogCommand(String catalogName)`	Get the SQL command used to drop the named catalog.
`String`	`getDropForeignKeyString()`	The subcommand of the `alter table` command used to drop a foreign key constraint, usually `drop constraint`.
`String[]`	`getDropSchemaCommand(String schemaName)`	Get the SQL command used to drop the named schema.
`String`	`getDropUniqueKeyString()`	The subcommand of the `alter table` command used to drop a unique key constraint.
`String`	`getEnableConstraintsStatement()`	A SQL statement that re-enables foreign key constraint checking for all tables.
`String`	`getEnumTypeDeclaration(String name, String[] values)`	If this database has a special MySQL-style `enum` column type, return the type declaration for the given enumeration of values.
`SqmMultiTableInsertStrategy`	`getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`	The `SqmMultiTableInsertStrategy` to use when not specified by `QueryEngineOptions.getCustomSqmMultiTableInsertStrategy()`.
`SqmMultiTableMutationStrategy`	`getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`	The `SqmMultiTableMutationStrategy` to use when not specified by `QueryEngineOptions.getCustomSqmMultiTableMutationStrategy()`.
`int`	`getFloatPrecision()`	This is the default precision for a generated column mapped to a Java `Float` or `float`.
`String`	`getForUpdateNowaitString()`	Retrieves the `FOR UPDATE NOWAIT` syntax specific to this dialect.
`String`	`getForUpdateNowaitString(String aliases)`	Get the `FOR UPDATE OF column_list NOWAIT` fragment appropriate for this dialect, given the aliases of the columns to be write locked.
`String`	`getForUpdateSkipLockedString()`	Retrieves the `FOR UPDATE SKIP LOCKED` syntax specific to this dialect.
`String`	`getForUpdateSkipLockedString(String aliases)`	Get the `FOR UPDATE OF column_list SKIP LOCKED` fragment appropriate for this dialect, given the aliases of the columns to be write locked.
`String`	`getForUpdateString(String aliases)`	Get the `FOR UPDATE OF column_list` fragment appropriate for this dialect, given the aliases of the columns to be write locked.
`long`	`getFractionalSecondPrecisionInNanos()`	`microsecond` is the smallest unit for `timestampadd()` and `timestampdiff()`, and the highest precision for a `timestamp`.
`FunctionalDependencyAnalysisSupport`	`getFunctionalDependencyAnalysisSupport()`	Get this dialect's level of support for primary key functional dependency analysis within `GROUP BY` and `ORDER BY` clauses.
`SelectItemReferenceStrategy`	`getGroupBySelectItemReferenceStrategy()`	Determine how selected items are referenced in the `group by` clause.
`IdentityColumnSupport`	`getIdentityColumnSupport()`	Get the appropriate `IdentityColumnSupport` for this dialect.
`LimitHandler`	`getLimitHandler()`	Obtain a `LimitHandler` that implements pagination support for `Query.setMaxResults(int)` and `Query.setFirstResult(int)`.
`int`	`getMaxAliasLength()`	What is the maximum length Hibernate can use for generated aliases?
`int`	`getMaxIdentifierLength()`	What is the maximum identifier length supported by this dialect?
`int`	`getMaxVarbinaryLength()`	The biggest size value that can be supplied as argument to a `Types.VARBINARY`-like type.
`int`	`getMaxVarcharLength()`	The biggest size value that can be supplied as argument to a `Types.VARCHAR`-like type.
`protected DatabaseVersion`	`getMinimumSupportedVersion()`	Get the version of the SQL dialect that is the minimum supported by this implementation.
`DatabaseVersion`	`getMySQLVersion()`
`NameQualifierSupport`	`getNameQualifierSupport()`	The support for qualified identifiers.
`String`	`getNullColumnString(String columnType)`	The keyword used to specify a nullable column of the given SQL type.
`NullOrdering`	`getNullOrdering()`	Returns the default ordering of null.
`int`	`getPreferredSqlTypeCodeForBoolean()`	The JDBC type code to use for mapping properties of Java type `boolean`.
`String`	`getQueryHintString(String query, String hints)`	Apply a hint to the given SQL query.
`String`	`getReadLockString(int timeout)`	Get the string to append to `SELECT` statements to acquire READ locks for this dialect.
`String`	`getReadLockString(String aliases, int timeout)`	Get the string to append to `SELECT` statements to acquire READ locks for this dialect, given the aliases of the columns to be read locked.
`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`	`getSelectGUIDString()`	Get the command used to select a GUID from the database.
`SequenceSupport`	`getSequenceSupport()`	No support for sequences.
`Dialect.SizeStrategy`	`getSizeStrategy()`	A custom `Dialect.SizeStrategy` for column types.
`SqlAstTranslatorFactory`	`getSqlAstTranslatorFactory()`	Return a `SqlAstTranslatorFactory` specific to this dialect, or `null` to use the standard translator.
`TemporaryTableKind`	`getSupportedTemporaryTableKind()`	The kind of temporary tables that are supported on this database.
`String`	`getTableComment(String comment)`	Get the comment into a form supported for table definition.
`String`	`getTableTypeString()`	An arbitrary fragment appended to the end of the `create table` statement.
`AfterUseAction`	`getTemporaryTableAfterUseAction()`	The action to take after finishing use of a temporary table.
`BeforeUseAction`	`getTemporaryTableBeforeUseAction()`	The action to take before beginning use of a temporary table.
`String`	`getTemporaryTableCreateCommand()`	The command to create a temporary table.
`String`	`getTemporaryTableDropCommand()`	The command to drop a temporary table.
`ViolatedConstraintNameExtractor`	`getViolatedConstraintNameExtractor()`	A `ViolatedConstraintNameExtractor` for extracting the name of a violated constraint from a `SQLException`.
`String`	`getWriteLockString(int timeout)`	Get the string to append to `SELECT` statements to acquire pessimistic WRITE locks for this dialect.
`String`	`getWriteLockString(String aliases, int timeout)`	Get the string to append to `SELECT` statements to acquire WRITE locks for this dialect, given the aliases of the columns to be write locked.
`RowLockStrategy`	`getWriteRowLockStrategy()`	The row lock strategy to use for write locks.
`boolean`	`hasSelfReferentialForeignKeyBug()`	Does the database/driver have bug in deleting rows that refer to other rows being deleted in the same query?
`protected void`	`initDefaultProperties()`	Set appropriate default values for configuration properties.
`void`	`initializeFunctionRegistry(FunctionContributions functionContributions)`	Initialize the given registry with any dialect-specific functions.
`boolean`	`isCurrentTimestampSelectStringCallable()`	Is the command returned by `Dialect.getCurrentTimestampSelectString()` treated as callable?
`boolean`	`isJdbcLogWarningsEnabledByDefault()`	Is JDBC statement warning logging enabled by default?
`boolean`	`isNoBackslashEscapesEnabled()`
`char`	`openQuote()`	The character specific to this dialect used to begin a quoted identifier.
`boolean`	`qualifyIndexName()`	Do we need to qualify index names with the schema name?
`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()`	Register the reserved words of ANSI-standard SQL as keywords.
`int`	`registerResultSetOutParameter(CallableStatement statement, int col)`	Registers a parameter capable of returning a `ResultSet` by position, either an `OUT` parameter, or a `REF_CURSOR` parameter as defined in Java 8.
`JdbcType`	`resolveSqlTypeDescriptor(String columnTypeName, int jdbcTypeCode, int precision, int scale, JdbcTypeRegistry jdbcTypeRegistry)`	Assigns an appropriate `JdbcType` to a column of a JDBC result set based on the column type name, JDBC type code, precision, and scale.
`boolean`	`supportsAlterColumnType()`	Does this dialect support modifying the type of an existing column?
`boolean`	`supportsCascadeDelete()`	Does this dialect support `on delete` actions in foreign key definitions?
`boolean`	`supportsColumnCheck()`	Does this dialect support column-level check constraints?
`boolean`	`supportsCommentOn()`	Does this dialect support commenting on tables and columns?
`boolean`	`supportsCurrentTimestampSelection()`	Does this dialect support some way to retrieve the current timestamp value from the database?
`boolean`	`supportsIfExistsBeforeTableName()`	For dropping a table, can the phrase `if exists` be applied before the table name?
`boolean`	`supportsIsTrue()`	Does this dialect support the `is true` and `is false` operators?
`boolean`	`supportsLateral()`	Does this dialect support the SQL `lateral` keyword or a proprietary alternative?
`boolean`	`supportsLobValueChangePropagation()`	Does the dialect support propagating changes to LOB values back to the database? Talking about mutating the internal value of the locator, as opposed to supplying a new locator instance.
`boolean`	`supportsLockTimeouts()`	Does this dialect support specifying timeouts when requesting locks.
`boolean`	`supportsNoWait()`	Does this dialect support `NO_WAIT` timeout.
`boolean`	`supportsNullPrecedence()`	Does this dialect support `nulls first` and `nulls last`?
`boolean`	`supportsOffsetInSubquery()`	Does this dialect support `offset` in subqueries?
`boolean`	`supportsRecursiveCTE()`	Does this dialect/database support recursive CTEs?
`boolean`	`supportsSkipLocked()`	Does this dialect support `SKIP_LOCKED` timeout.
`boolean`	`supportsSubqueryOnMutatingTable()`	Does this dialect support referencing the table being mutated in a subquery? The "table being mutated" is the table referenced in an update or delete query.
`boolean`	`supportsTemporalLiteralOffset()`	Does this dialect supports timezone offsets in temporal literals.
`boolean`	`supportsWait()`	Does this dialect support `WAIT` timeout.
`boolean`	`supportsWindowFunctions()`	Does this dialect support window functions like `row_number() over (..)`?
`String`	`timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType)`	Obtain a pattern for the SQL equivalent to a `timestampadd()` function call.
`String`	`timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType)`	Obtain a pattern for the SQL equivalent to a `timestampdiff()` function call.
`boolean`	`useMaterializedLobWhenCapacityExceeded()`	Whether to switch: from `VARCHAR`-like types to `SqlTypes.MATERIALIZED_CLOB` types when the requested size for a type exceeds the `Dialect.getMaxVarcharCapacity()`, from `NVARCHAR`-like types to `SqlTypes.MATERIALIZED_NCLOB` types when the requested size for a type exceeds the `Dialect.getMaxNVarcharCapacity()`, and from `VARBINARY`-like types to `SqlTypes.MATERIALIZED_BLOB` types when the requested size for a type exceeds the `Dialect.getMaxVarbinaryCapacity()`.

Methods inherited from class org.hibernate.dialect.Dialect
addSqlHintOrComment, appendArrayLiteral, appendBinaryLiteral, appendBooleanValueString, appendIntervalLiteral, appendLockHint, appendUUIDLiteral, applyLocksToSql, augmentPhysicalTableTypes, augmentRecognizedTableTypes, canBatchTruncate, checkVersion, contribute, contributeFunctions, createOptionalTableUpdateOperation, currentDate, currentLocalTime, currentLocalTimestamp, currentTime, currentTimestampWithTimeZone, defaultScrollMode, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, equivalentTypes, escapeComment, forceLobAsLastValue, generatedAs, getAddColumnString, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAggregateSupport, getAlterTableString, getArrayTypeName, getAuxiliaryDatabaseObjectExporter, getBatchLoadSizingStrategy, getCallableStatementSupport, getCascadeConstraintsString, getCaseInsensitiveLike, getCheckCondition, getCheckCondition, getCheckCondition, getCheckCondition, getColumnAliasExtractor, getCreateEnumTypeCommand, getCreateEnumTypeCommand, getCreateIndexString, getCreateIndexTail, getCreateMultisetTableString, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCreateUserDefinedTypeExtensionsString, getCreateUserDefinedTypeKindString, getCurrentSchemaCommand, getDefaultDecimalPrecision, getDefaultNonContextualLobCreation, getDefaultProperties, getDefaultStatementBatchSize, getDefaultTimestampPrecision, getDefaultUseGetGeneratedKeys, getDisableConstraintStatement, getDmlTargetColumnQualifierSupport, getDoublePrecision, getDropEnumTypeCommand, getDropEnumTypeCommand, getDropTableString, getEnableConstraintStatement, getEnumTypeDeclaration, getFallbackSchemaManagementTool, getForeignKeyExporter, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getHqlTranslator, getIndexExporter, getInExpressionCountLimit, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxNVarcharCapacity, getMaxNVarcharLength, getMaxVarbinaryCapacity, getMaxVarcharCapacity, getMultiKeyLoadSizingStrategy, getNationalizationSupport, getNativeIdentifierGeneratorStrategy, getNativeParameterMarkerStrategy, getNoColumnsInsertString, getNullColumnString, getParameterCountLimit, getPreferredSqlTypeCodeForArray, getQueryHintString, getQuerySequencesString, getReadRowLockStrategy, getResultSet, getResultSet, getRowIdColumnString, getSchemaNameResolver, getSelectClauseNullString, getSequenceExporter, getSequenceInformationExtractor, getSqmTranslatorFactory, getTableCleaner, getTableExporter, getTableMigrator, getTemporaryTableCreateOptions, getTemporaryTableDdlTransactionHandling, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getTimeoutInSeconds, getTimeZoneSupport, getTruncateTableStatement, getTruncateTableStatements, getUniqueDelegate, getUniqueKeyExporter, getUserDefinedTypeComment, getUserDefinedTypeExporter, getVersion, hasAlterTable, hasDataTypeBeforeGeneratedAs, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isLob, isLockTimeoutParameterized, ordinal, prependComment, quote, quoteCollation, registerKeyword, registerKeywords, registerResultSetOutParameter, requiresCastForConcatenatingNonStrings, requiresFloatCastingOfIntegerDivision, requiresParensForTupleCounts, requiresParensForTupleDistinctCounts, resolveSqlTypeCode, resolveSqlTypeCode, resolveSqlTypeLength, rowId, rowIdSqlType, supportsBindAsCallableArgument, supportsBitType, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsDistinctFromPredicate, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsFetchClause, supportsFractionalTimestampArithmetic, supportsIfExistsAfterAlterTable, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTableName, supportsIfExistsAfterTypeName, supportsIfExistsBeforeConstraintName, supportsIfExistsBeforeTypeName, supportsInsertReturning, supportsInsertReturningGeneratedKeys, supportsJdbcConnectionLobCreation, supportsMaterializedLobAccess, supportsNamedParameters, supportsNoColumnsInsert, supportsNonQueryWithCTE, supportsOrderByInSubquery, supportsOrdinalSelectItemReference, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPartitionBy, supportsPredicateAsExpression, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsStandardArrays, supportsStandardCurrentTimestampFunction, supportsSubqueryInSelect, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporaryTablePrimaryKey, supportsTemporaryTables, supportsTruncateWithCast, supportsTupleCounts, supportsTupleDistinctCounts, supportsUnboundedLobLocatorMaterialization, supportsUnionAll, supportsUnionInSubquery, supportsValuesList, supportsValuesListForInsert, toBooleanValueString, toQuotedIdentifier, toString, transformSelectString, translateDurationField, translateExtractField, trimPattern, useArrayForMultiValuedParameters, useFollowOnLocking, useInputStreamToInsertBlob

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

- Constructor Detail
  - MySQLDialect
```
public MySQLDialect()
```
  - MySQLDialect
```
public MySQLDialect(DatabaseVersion version)
```
  - MySQLDialect
```
public MySQLDialect(DatabaseVersion version,
                    int bytesPerCharacter)
```
  - MySQLDialect
```
public MySQLDialect(DatabaseVersion version,
                    MySQLServerConfiguration serverConfiguration)
```
  - MySQLDialect
```
public MySQLDialect(DatabaseVersion version,
                    int bytesPerCharacter,
                    boolean noBackslashEscapes)
```
  - MySQLDialect
```
public MySQLDialect(DialectResolutionInfo info)
```
- Method Detail
  - createVersion
```
protected static DatabaseVersion createVersion(DialectResolutionInfo info)
```
  - getMinimumSupportedVersion
```
protected DatabaseVersion getMinimumSupportedVersion()
```
    Description copied from class: Dialect
    
    Get the version of the SQL dialect that is the minimum supported by this implementation.
    
    Overrides:
    
    getMinimumSupportedVersion in class Dialect
  - initDefaultProperties
```
protected void initDefaultProperties()
```
    Description copied from class: Dialect
    
    Set appropriate default values for configuration properties.
    This default implementation sets "hibernate.jdbc.batch_size", "hibernate.jdbc.lob.non_contextual_creation", and "hibernate.jdbc.use_get_generated_keys" to defaults determined by calling Dialect.getDefaultStatementBatchSize(), Dialect.getDefaultNonContextualLobCreation(), and Dialect.getDefaultUseGetGeneratedKeys().
    An implementation may set additional configuration properties, but this is discouraged.
    
    Overrides:
    
    initDefaultProperties in class Dialect
  - 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
  - useMaterializedLobWhenCapacityExceeded
```
public boolean useMaterializedLobWhenCapacityExceeded()
```
    Description copied from class: Dialect
    Whether to switch:
    
    from VARCHAR-like types to SqlTypes.MATERIALIZED_CLOB types when the requested size for a type exceeds the Dialect.getMaxVarcharCapacity(),
    from NVARCHAR-like types to SqlTypes.MATERIALIZED_NCLOB types when the requested size for a type exceeds the Dialect.getMaxNVarcharCapacity(), and
    from VARBINARY-like types to SqlTypes.MATERIALIZED_BLOB types when the requested size for a type exceeds the Dialect.getMaxVarbinaryCapacity().
    Overrides:
    
    useMaterializedLobWhenCapacityExceeded in class Dialect
    
    Returns:
    
    true if materialized LOBs should be used for capacity exceeding types.
  - castType
```
protected String castType(int sqlTypeCode)
```
    Description copied from class: Dialect
    
    The SQL type to use in cast( ... as ... ) expressions when casting to the target type represented by the given JDBC type code.
    
    Overrides:
    
    castType in class Dialect
    
    Parameters:
    
    sqlTypeCode - The JDBC type code representing the target type
    
    Returns:
    
    The SQL type to use in cast()
  - 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
  - getCharacterSetBytesPerCharacter
```
@Deprecated
protected static int getCharacterSetBytesPerCharacter(DatabaseMetaData databaseMetaData)
```
    Deprecated.
  - 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
  - getMaxVarbinaryLength
```
public int getMaxVarbinaryLength()
```
    Description copied from class: Dialect
    
    The biggest size value that can be supplied as argument to a Types.VARBINARY-like type.
    For longer column lengths, use some sort of image-like type for the column.
    
    Overrides:
    
    getMaxVarbinaryLength in class Dialect
  - isNoBackslashEscapesEnabled
```
public boolean isNoBackslashEscapesEnabled()
```
  - getNullColumnString
```
public String getNullColumnString(String columnType)
```
    Description copied from class: Dialect
    
    The keyword used to specify a nullable column of the given SQL type.
    
    Overrides:
    
    getNullColumnString in class Dialect
  - getMySQLVersion
```
public DatabaseVersion getMySQLVersion()
```
  - getSizeStrategy
```
public Dialect.SizeStrategy getSizeStrategy()
```
    Description copied from class: Dialect
    
    A custom Dialect.SizeStrategy for column types.
    
    Overrides:
    
    getSizeStrategy in class Dialect
  - getDefaultLobLength
```
public long getDefaultLobLength()
```
    Description copied from class: Dialect
    
    The default length for a LOB column, if LOB columns have a length in this dialect.
    
    Overrides:
    
    getDefaultLobLength in class Dialect
    
    Returns:
    
    1048576L by default
    
    See Also:
    
    Length.LOB_DEFAULT
  - resolveSqlTypeDescriptor
```
public JdbcType resolveSqlTypeDescriptor(String columnTypeName,
                                         int jdbcTypeCode,
                                         int precision,
                                         int scale,
                                         JdbcTypeRegistry jdbcTypeRegistry)
```
    Description copied from class: Dialect
    
    Assigns an appropriate JdbcType to a column of a JDBC result set based on the column type name, JDBC type code, precision, and scale.
    
    Overrides:
    
    resolveSqlTypeDescriptor in class Dialect
    
    Parameters:
    
    columnTypeName - the column type name
    
    jdbcTypeCode - the type code
    
    precision - the precision or 0
    
    scale - the scale or 0
    
    Returns:
    
    an appropriate instance of JdbcType
  - getPreferredSqlTypeCodeForBoolean
```
public int getPreferredSqlTypeCodeForBoolean()
```
    Description copied from class: Dialect
    
    The JDBC type code to use for mapping properties of Java type boolean.
    Usually Types.BOOLEAN or Types.BIT.
    
    Overrides:
    
    getPreferredSqlTypeCodeForBoolean in class Dialect
    
    Returns:
    
    one of the type codes defined by Types.
  - initializeFunctionRegistry
```
public void initializeFunctionRegistry(FunctionContributions functionContributions)
```
    Description copied from class: Dialect
    Initialize the given registry with any dialect-specific functions.
    Support for certain SQL functions is required, and if the database does not support a required function, then the dialect must define a way to emulate it.
    These required functions include the functions defined by the JPA query language specification:
    
    avg(arg) - aggregate function
    count([distinct ]arg) - aggregate function
    max(arg) - aggregate function
    min(arg) - aggregate function
    sum(arg) - aggregate function
    
    coalesce(arg0, arg1, ...)
    nullif(arg0, arg1)
    
    lower(arg)
    upper(arg)
    length(arg)
    concat(arg0, arg1, ...)
    locate(pattern, string[, start])
    substring(string, start[, length])
    trim([[spec ][character ]from] string)
    
    abs(arg)
    mod(arg0, arg1)
    sqrt(arg)
    
    current date
    current time
    current timestamp
    Along with an additional set of functions defined by ANSI SQL:
    
    any(arg) - aggregate function
    every(arg) - aggregate function
    
    var_samp(arg) - aggregate function
    var_pop(arg) - aggregate function
    stddev_samp(arg) - aggregate function
    stddev_pop(arg) - aggregate function
    
    cast(arg as Type)
    extract(field from arg)
    
    ln(arg)
    exp(arg)
    power(arg0, arg1)
    floor(arg)
    ceiling(arg)
    
    position(pattern in string)
    substring(string from start[ for length])
    overlay(string placing replacement from start[ for length])
    And the following functions for working with java.time types:
    
    local date
    local time
    local datetime
    offset datetime
    instant
    And a number of additional "standard" functions:
    
    left(string, length)
    right(string, length)
    replace(string, pattern, replacement)
    pad(string with length spec[ character])
    repeat(string, times)
    
    pi
    log10(arg)
    log(base, arg)
    sign(arg)
    sin(arg)
    cos(arg)
    tan(arg)
    asin(arg)
    acos(arg)
    atan(arg)
    atan2(arg0, arg1)
    round(arg0[, arg1])
    truncate(arg0[, arg1])
    sinh(arg)
    tanh(arg)
    cosh(arg)
    least(arg0, arg1, ...)
    greatest(arg0, arg1, ...)
    degrees(arg)
    radians(arg)
    
    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
  - contributeTypes
```
public void contributeTypes(TypeContributions typeContributions,
                            ServiceRegistry serviceRegistry)
```
    Description copied from class: Dialect
    
    A callback which allows the Dialect to contribute types.
    
    Overrides:
    
    contributeTypes in class Dialect
    
    Parameters:
    
    typeContributions - Callback to contribute the types
    
    serviceRegistry - The service registry
  - getSqlAstTranslatorFactory
```
public SqlAstTranslatorFactory getSqlAstTranslatorFactory()
```
    Description copied from class: Dialect
    
    Return a SqlAstTranslatorFactory specific to this dialect, or null to use the standard translator.
    
    Overrides:
    
    getSqlAstTranslatorFactory in class Dialect
    
    See Also:
    
    StandardSqlAstTranslatorFactory, JdbcEnvironment.getSqlAstTranslatorFactory()
  - castPattern
```
public String castPattern(CastType from,
                          CastType to)
```
    Description copied from class: Dialect
    
    Obtain a pattern for the SQL equivalent to a cast() function call. The resulting pattern must contain ?1 and ?2 placeholders for the arguments.
    
    Overrides:
    
    castPattern in class Dialect
    
    Parameters:
    
    from - a CastType indicating the type of the value argument
    
    to - a CastType indicating the type the value argument is cast to
  - getFloatPrecision
```
public int getFloatPrecision()
```
    Description copied from class: Dialect
    
    This is the default precision for a generated column mapped to a Java Float or float. That is, a value representing "single precision".
    Usually 24 binary digits, at least for databases with a conventional interpretation of the ANSI SQL specification.
    
    Overrides:
    
    getFloatPrecision in class Dialect
    
    Returns:
    
    a value representing "single precision", usually in binary digits, but sometimes in decimal digits
  - currentTimestamp
```
public String currentTimestamp()
```
    MySQL 5.7 precision defaults to seconds, but microseconds is better
    
    Overrides:
    
    currentTimestamp in class Dialect
  - getFractionalSecondPrecisionInNanos
```
public long getFractionalSecondPrecisionInNanos()
```
    microsecond is the smallest unit for timestampadd() and timestampdiff(), and the highest precision for a timestamp.
    
    Overrides:
    
    getFractionalSecondPrecisionInNanos in class Dialect
    
    Returns:
    
    the precision, specified as a quantity of nanoseconds
    
    See Also:
    
    TemporalUnit.NATIVE
  - extractPattern
```
public String extractPattern(TemporalUnit unit)
```
    MySQL supports a limited list of temporal fields in the extract() function, but we can emulate some of them by using the appropriate named functions instead of extract(). Thus, the additional supported fields are TemporalUnit.DAY_OF_YEAR, TemporalUnit.DAY_OF_MONTH, TemporalUnit.DAY_OF_YEAR. In addition, the field TemporalUnit.SECOND is redefined to include microseconds.
    
    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
    
    Does this dialect supports timezone offsets in temporal literals.
    
    Overrides:
    
    supportsTemporalLiteralOffset in class Dialect
  - appendDateTimeLiteral
```
public void appendDateTimeLiteral(SqlAppender appender,
                                  TemporalAccessor temporalAccessor,
                                  TemporalType precision,
                                  TimeZone jdbcTimeZone)
```
    Description copied from class: Dialect
    
    Append a datetime literal representing the given java.time value to the given SqlAppender.
    
    Overrides:
    
    appendDateTimeLiteral in class Dialect
  - appendDateTimeLiteral
```
public void appendDateTimeLiteral(SqlAppender appender,
                                  Date date,
                                  TemporalType precision,
                                  TimeZone jdbcTimeZone)
```
    Description copied from class: Dialect
    
    Append a datetime literal representing the given Date value to the given SqlAppender.
    
    Overrides:
    
    appendDateTimeLiteral in class Dialect
  - appendDateTimeLiteral
```
public void appendDateTimeLiteral(SqlAppender appender,
                                  Calendar calendar,
                                  TemporalType precision,
                                  TimeZone jdbcTimeZone)
```
    Description copied from class: Dialect
    
    Append a datetime literal representing the given Calendar value to the given SqlAppender.
    
    Overrides:
    
    appendDateTimeLiteral in class Dialect
  - getGroupBySelectItemReferenceStrategy
```
public SelectItemReferenceStrategy getGroupBySelectItemReferenceStrategy()
```
    Description copied from class: Dialect
    
    Determine how selected items are referenced in the group by clause.
    
    Overrides:
    
    getGroupBySelectItemReferenceStrategy in class Dialect
  - supportsColumnCheck
```
public boolean supportsColumnCheck()
```
    Description copied from class: Dialect
    
    Does this dialect support column-level check constraints?
    
    Overrides:
    
    supportsColumnCheck in class Dialect
    
    Returns:
    
    True if column-level check constraints are supported; false otherwise.
  - getEnumTypeDeclaration
```
public String getEnumTypeDeclaration(String name,
                                     String[] values)
```
    Description copied from class: Dialect
    
    If this database has a special MySQL-style enum column type, return the type declaration for the given enumeration of values.
    If the database has no such type, return null.
    
    Overrides:
    
    getEnumTypeDeclaration in class Dialect
    
    values - the enumerated values of the type
    
    Returns:
    
    the DDL column type declaration
  - getQueryHintString
```
public String getQueryHintString(String query,
                                 String hints)
```
    Description copied from class: Dialect
    
    Apply a hint to the given SQL query.
    The entire query is provided, allowing full control over the placement and syntax of the hint.
    By default, ignore the hint and simply return the query.
    
    Overrides:
    
    getQueryHintString in class Dialect
    
    Parameters:
    
    query - The query to which to apply the hint.
    
    hints - The hints to apply
    
    Returns:
    
    The modified SQL
  - getSequenceSupport
```
public SequenceSupport getSequenceSupport()
```
    No support for sequences.
    
    Overrides:
    
    getSequenceSupport in class Dialect
  - getViolatedConstraintNameExtractor
```
public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor()
```
    Description copied from class: Dialect
    
    A ViolatedConstraintNameExtractor for extracting the name of a violated constraint from a SQLException.
    
    Specified by:
    
    getViolatedConstraintNameExtractor in interface ConversionContext
    
    Overrides:
    
    getViolatedConstraintNameExtractor in class Dialect
  - qualifyIndexName
```
public boolean qualifyIndexName()
```
    Description copied from class: Dialect
    
    Do we need to qualify index names with the schema name?
    
    Overrides:
    
    qualifyIndexName in class Dialect
    
    Returns:
    
    true if we do
  - getAddForeignKeyConstraintString
```
public String getAddForeignKeyConstraintString(String constraintName,
                                               String[] foreignKey,
                                               String referencedTable,
                                               String[] primaryKey,
                                               boolean referencesPrimaryKey)
```
    Description copied from class: Dialect
    
    The syntax used to add a foreign key constraint to a table, with the referenced key columns explicitly specified.
    
    Overrides:
    
    getAddForeignKeyConstraintString in class Dialect
    
    Parameters:
    
    constraintName - The foreign key constraint name
    
    foreignKey - The names of the columns comprising the foreign key
    
    referencedTable - The table referenced by the foreign key
    
    primaryKey - The explicit columns in the referencedTable referenced by this foreign key.
    
    referencesPrimaryKey - if false, constraint should be explicit about which column names the constraint refers to
    
    Returns:
    
    the "add FK" fragment
  - getDropForeignKeyString
```
public String getDropForeignKeyString()
```
    Description copied from class: Dialect
    
    The subcommand of the alter table command used to drop a foreign key constraint, usually drop constraint.
    
    Overrides:
    
    getDropForeignKeyString in class Dialect
  - getDropUniqueKeyString
```
public String getDropUniqueKeyString()
```
    Description copied from class: Dialect
    
    The subcommand of the alter table command used to drop a unique key constraint.
    
    Overrides:
    
    getDropUniqueKeyString in class Dialect
  - getAlterColumnTypeString
```
public String getAlterColumnTypeString(String columnName,
                                       String columnType,
                                       String columnDefinition)
```
    Description copied from class: Dialect
    
    The fragment of an alter table command which modifies a column type, or null if column types cannot be modified. Often alter column col_name set data type col_type.
    
    Overrides:
    
    getAlterColumnTypeString in class Dialect
    
    Parameters:
    
    columnName - the name of the column
    
    columnType - the new type of the column
    
    columnDefinition - the full column definition
    
    Returns:
    
    a fragment to be appended to alter table
  - supportsAlterColumnType
```
public boolean supportsAlterColumnType()
```
    Description copied from class: Dialect
    
    Does this dialect support modifying the type of an existing column?
    
    Overrides:
    
    supportsAlterColumnType in class Dialect
  - getLimitHandler
```
public LimitHandler getLimitHandler()
```
    Description copied from class: Dialect
    
    Obtain a LimitHandler that implements pagination support for Query.setMaxResults(int) and Query.setFirstResult(int).
    
    Overrides:
    
    getLimitHandler in class Dialect
  - closeQuote
```
public char closeQuote()
```
    Description copied from class: Dialect
    
    The character specific to this dialect used to close a quoted identifier.
    
    Overrides:
    
    closeQuote in class Dialect
    
    Returns:
    
    The dialect-specific close quote character.
  - openQuote
```
public char openQuote()
```
    Description copied from class: Dialect
    
    The character specific to this dialect used to begin a quoted identifier.
    
    Overrides:
    
    openQuote in class Dialect
    
    Returns:
    
    The dialect-specific open quote character.
  - canCreateCatalog
```
public boolean canCreateCatalog()
```
    Description copied from class: Dialect
    
    Does this dialect support creating and dropping catalogs?
    
    Overrides:
    
    canCreateCatalog in class Dialect
    
    Returns:
    
    True if the dialect supports catalog creation; false otherwise.
  - getCreateCatalogCommand
```
public String[] getCreateCatalogCommand(String catalogName)
```
    Description copied from class: Dialect
    
    Get the SQL command used to create the named catalog.
    
    Overrides:
    
    getCreateCatalogCommand in class Dialect
    
    Parameters:
    
    catalogName - The name of the catalog to be created.
    
    Returns:
    
    The creation commands
  - getDropCatalogCommand
```
public String[] getDropCatalogCommand(String catalogName)
```
    Description copied from class: Dialect
    
    Get the SQL command used to drop the named catalog.
    
    Overrides:
    
    getDropCatalogCommand in class Dialect
    
    Parameters:
    
    catalogName - The name of the catalog to be dropped.
    
    Returns:
    
    The drop commands
  - canCreateSchema
```
public boolean canCreateSchema()
```
    Description copied from class: Dialect
    
    Does this dialect support creating and dropping schema?
    
    Overrides:
    
    canCreateSchema in class Dialect
    
    Returns:
    
    True if the dialect supports schema creation; false otherwise.
  - getCreateSchemaCommand
```
public String[] getCreateSchemaCommand(String schemaName)
```
    Description copied from class: Dialect
    
    Get the SQL command used to create the named schema.
    
    Overrides:
    
    getCreateSchemaCommand in class Dialect
    
    Parameters:
    
    schemaName - The name of the schema to be created.
    
    Returns:
    
    The creation commands
  - getDropSchemaCommand
```
public String[] getDropSchemaCommand(String schemaName)
```
    Description copied from class: Dialect
    
    Get the SQL command used to drop the named schema.
    
    Overrides:
    
    getDropSchemaCommand in class Dialect
    
    Parameters:
    
    schemaName - The name of the schema to be dropped.
    
    Returns:
    
    The drop commands
  - supportsIfExistsBeforeTableName
```
public boolean supportsIfExistsBeforeTableName()
```
    Description copied from class: Dialect
    
    For dropping a table, can the phrase if exists be applied before the table name?
    
    Overrides:
    
    supportsIfExistsBeforeTableName in class Dialect
    
    Returns:
    
    true if if exists can be applied before the table name
  - getSelectGUIDString
```
public String getSelectGUIDString()
```
    Description copied from class: Dialect
    
    Get the command used to select a GUID from the database.
    Optional operation.
    
    Overrides:
    
    getSelectGUIDString in class Dialect
    
    Returns:
    
    The appropriate command.
  - supportsCommentOn
```
public boolean supportsCommentOn()
```
    Description copied from class: Dialect
    
    Does this dialect support commenting on tables and columns?
    
    Overrides:
    
    supportsCommentOn in class Dialect
    
    Returns:
    
    true if commenting is supported
  - getTableComment
```
public String getTableComment(String comment)
```
    Description copied from class: Dialect
    
    Get the comment into a form supported for table definition.
    
    Overrides:
    
    getTableComment in class Dialect
    
    Parameters:
    
    comment - The comment to apply
    
    Returns:
    
    The comment fragment
  - getColumnComment
```
public String getColumnComment(String comment)
```
    Description copied from class: Dialect
    
    Get the comment into a form supported for column definition.
    
    Overrides:
    
    getColumnComment in class Dialect
    
    Parameters:
    
    comment - The comment to apply
    
    Returns:
    
    The comment fragment
  - getNullOrdering
```
public NullOrdering getNullOrdering()
```
    Description copied from class: Dialect
    
    Returns the default ordering of null.
    
    Overrides:
    
    getNullOrdering in class Dialect
  - getFallbackSqmMutationStrategy
```
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor,
                                                                    RuntimeModelCreationContext runtimeModelCreationContext)
```
    Description copied from class: Dialect
    
    The SqmMultiTableMutationStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableMutationStrategy().
    
    Overrides:
    
    getFallbackSqmMutationStrategy in class Dialect
    
    See Also:
    
    SqmMultiTableMutationStrategyProvider.createMutationStrategy(org.hibernate.metamodel.mapping.EntityMappingType, org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess)
  - getFallbackSqmInsertStrategy
```
public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor,
                                                                RuntimeModelCreationContext runtimeModelCreationContext)
```
    Description copied from class: Dialect
    
    The SqmMultiTableInsertStrategy to use when not specified by QueryEngineOptions.getCustomSqmMultiTableInsertStrategy().
    
    Overrides:
    
    getFallbackSqmInsertStrategy in class Dialect
    
    See Also:
    
    SqmMultiTableMutationStrategyProvider.createInsertStrategy(org.hibernate.metamodel.mapping.EntityMappingType, org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess)
  - getSupportedTemporaryTableKind
```
public TemporaryTableKind getSupportedTemporaryTableKind()
```
    Description copied from class: Dialect
    
    The kind of temporary tables that are supported on this database.
    
    Overrides:
    
    getSupportedTemporaryTableKind in class Dialect
  - getTemporaryTableCreateCommand
```
public String getTemporaryTableCreateCommand()
```
    Description copied from class: Dialect
    
    The command to create a temporary table.
    
    Overrides:
    
    getTemporaryTableCreateCommand in class Dialect
  - getTemporaryTableDropCommand
```
public String getTemporaryTableDropCommand()
```
    Description copied from class: Dialect
    
    The command to drop a temporary table.
    
    Overrides:
    
    getTemporaryTableDropCommand in class Dialect
  - getTemporaryTableAfterUseAction
```
public AfterUseAction getTemporaryTableAfterUseAction()
```
    Description copied from class: Dialect
    
    The action to take after finishing use of a temporary table.
    
    Overrides:
    
    getTemporaryTableAfterUseAction in class Dialect
  - getTemporaryTableBeforeUseAction
```
public BeforeUseAction getTemporaryTableBeforeUseAction()
```
    Description copied from class: Dialect
    
    The action to take before beginning use of a temporary table.
    
    Overrides:
    
    getTemporaryTableBeforeUseAction in class Dialect
  - getMaxAliasLength
```
public int getMaxAliasLength()
```
    Description copied from class: Dialect
    
    What is the maximum length Hibernate can use for generated aliases?
    
    Overrides:
    
    getMaxAliasLength in class Dialect
    
    Returns:
    
    The maximum length.
  - getMaxIdentifierLength
```
public int getMaxIdentifierLength()
```
    Description copied from class: Dialect
    
    What is the maximum identifier length supported by this dialect?
    
    Overrides:
    
    getMaxIdentifierLength in class Dialect
    
    Returns:
    
    The maximum length.
  - supportsIsTrue
```
public boolean supportsIsTrue()
```
    Description copied from class: Dialect
    
    Does this dialect support the is true and is false operators?
    
    Overrides:
    
    supportsIsTrue in class Dialect
    
    Returns:
    
    true if the database supports is true and is false, or false if it does not. The default is is false.
  - supportsCurrentTimestampSelection
```
public boolean supportsCurrentTimestampSelection()
```
    Description copied from class: Dialect
    
    Does this dialect support some way to retrieve the current timestamp value from the database?
    
    Overrides:
    
    supportsCurrentTimestampSelection in class Dialect
    
    Returns:
    
    True if the current timestamp can be retrieved; false otherwise.
  - isCurrentTimestampSelectStringCallable
```
public boolean isCurrentTimestampSelectStringCallable()
```
    Description copied from class: Dialect
    
    Is the command returned by Dialect.getCurrentTimestampSelectString() treated as callable?
    Typically, this indicates the use of the JDBC escape syntax.
    
    Overrides:
    
    isCurrentTimestampSelectStringCallable in class Dialect
    
    Returns:
    
    if the Dialect.getCurrentTimestampSelectString() is treated as callable; false otherwise.
  - getCurrentTimestampSelectString
```
public String getCurrentTimestampSelectString()
```
    Description copied from class: Dialect
    
    The command used to retrieve the current timestamp from the database.
    
    Overrides:
    
    getCurrentTimestampSelectString in class Dialect
  - registerResultSetOutParameter
```
public int registerResultSetOutParameter(CallableStatement statement,
                                         int col)
                                  throws SQLException
```
    Description copied from class: Dialect
    
    Registers a parameter capable of returning a ResultSet by position, either an OUT parameter, or a REF_CURSOR parameter as defined in Java 8.
    
    Overrides:
    
    registerResultSetOutParameter in class Dialect
    
    Parameters:
    
    statement - The callable statement.
    
    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.
  - supportsNullPrecedence
```
public boolean supportsNullPrecedence()
```
    Description copied from class: Dialect
    
    Does this dialect support nulls first and nulls last?
    
    Overrides:
    
    supportsNullPrecedence in class Dialect
  - supportsLobValueChangePropagation
```
public boolean supportsLobValueChangePropagation()
```
    Description copied from class: Dialect
    Does the dialect support propagating changes to LOB values back to the database? Talking about mutating the internal value of the locator, as opposed to supplying a new locator instance.
    
    For BLOBs, the internal value might be changed by: Blob.setBinaryStream(long), Blob.setBytes(long, byte[]), Blob.setBytes(long, byte[], int, int), or Blob.truncate(long).
    For CLOBs, the internal value might be changed by: Clob.setAsciiStream(long), Clob.setCharacterStream(long), Clob.setString(long, String), Clob.setString(long, String, int, int), or Clob.truncate(long).
    Overrides:
    
    supportsLobValueChangePropagation in class Dialect
    
    Returns:
    
    True if the changes are propagated back to the database; false otherwise.
  - supportsSubqueryOnMutatingTable
```
public boolean supportsSubqueryOnMutatingTable()
```
    Description copied from class: Dialect
    Does this dialect support referencing the table being mutated in a subquery? The "table being mutated" is the table referenced in an update or delete query. And so can that table then be referenced in a subquery of the update or delete query?
    For example, would the following two syntaxes be supported:
    
    delete from TABLE_A where ID not in (select ID from TABLE_A)
    update TABLE_A set NON_ID = 'something' where ID in (select ID from TABLE_A)
    Overrides:
    
    supportsSubqueryOnMutatingTable in class Dialect
    
    Returns:
    
    True if this dialect allows references the mutating table from a subquery.
  - supportsLockTimeouts
```
public boolean supportsLockTimeouts()
```
    Description copied from class: Dialect
    
    Does this dialect support specifying timeouts when requesting locks.
    
    Overrides:
    
    supportsLockTimeouts in class Dialect
    
    Returns:
    
    True is this dialect supports specifying lock timeouts.
  - buildSQLExceptionConversionDelegate
```
public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate()
```
    Description copied from class: Dialect
    An instance of SQLExceptionConversionDelegate for interpreting dialect-specific error or SQLState codes.
    If this method is overridden to return a non-null value, the default SQLExceptionConverter will use the returned SQLExceptionConversionDelegate in addition to the following standard delegates:
    
    a "static" delegate based on the JDBC4-defined SQLException hierarchy, and
    a delegate that interprets SQLState codes as either X/Open or SQL-2003 codes, depending on what is reported by the JDBC driver.
    
    It is strongly recommended that every Dialect implementation override this method, since interpretation of a SQL error is much more accurate when based on the vendor-specific error code, rather than on the SQLState.
    Overrides:
    
    buildSQLExceptionConversionDelegate in class Dialect
    
    Returns:
    
    The SQLExceptionConversionDelegate for this dialect
  - getNameQualifierSupport
```
public NameQualifierSupport getNameQualifierSupport()
```
    Description copied from class: Dialect
    
    The support for qualified identifiers.
    By default, decide based on DatabaseMetaData.
    
    Overrides:
    
    getNameQualifierSupport in class Dialect
    
    Returns:
    
    The NameQualifierSupport, or null to use DatabaseMetaData.
  - buildIdentifierHelper
```
public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder,
                                              DatabaseMetaData dbMetaData)
                                       throws SQLException
```
    Description copied from class: Dialect
    The IdentifierHelper indicated by this dialect for handling identifier conversions. Returning null is allowed and indicates that Hibernate should fall back to building a "standard" helper. In the fallback path, any changes made to the IdentifierHelperBuilder during this call will still be incorporated into the built IdentifierHelper.
    The incoming builder will have the following set:
    
    IdentifierHelperBuilder.isGloballyQuoteIdentifiers()
    
    IdentifierHelperBuilder.getUnquotedCaseStrategy() - initialized to UPPER
    
    IdentifierHelperBuilder.getQuotedCaseStrategy() - initialized to MIXED
    
    By default, Hibernate will do the following:
    
    Call IdentifierHelperBuilder.applyIdentifierCasing(DatabaseMetaData)
    Call IdentifierHelperBuilder.applyReservedWords(DatabaseMetaData)
    Applies AnsiSqlKeywords.sql2003() as reserved words
    
    Applies the {#link #sqlKeywords} collected here as reserved words
    
    Applies the Dialect's NameQualifierSupport, if it defines one
    Overrides:
    
    buildIdentifierHelper in class Dialect
    
    Parameters:
    
    builder - A partially-configured IdentifierHelperBuilder.
    
    dbMetaData - Access to the metadata returned from the driver if needed and if available. WARNING: it may be null.
    
    Returns:
    
    The IdentifierHelper instance to use, or null to indicate Hibernate should use its fallback path
    
    Throws:
    
    SQLException - Accessing the DatabaseMetaData can throw it. Just rethrow and Hibernate will handle it.
    
    See Also:
    
    Dialect.getNameQualifierSupport()
  - getIdentityColumnSupport
```
public IdentityColumnSupport getIdentityColumnSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate IdentityColumnSupport for this dialect.
    
    Overrides:
    
    getIdentityColumnSupport in class Dialect
    
    Returns:
    
    the IdentityColumnSupport
  - isJdbcLogWarningsEnabledByDefault
```
public boolean isJdbcLogWarningsEnabledByDefault()
```
    Description copied from class: Dialect
    
    Is JDBC statement warning logging enabled by default?
    
    Overrides:
    
    isJdbcLogWarningsEnabledByDefault in class Dialect
  - supportsCascadeDelete
```
public boolean supportsCascadeDelete()
```
    Description copied from class: Dialect
    
    Does this dialect support on delete actions in foreign key definitions?
    
    Overrides:
    
    supportsCascadeDelete in class Dialect
    
    Returns:
    
    true if the dialect does support the on delete clause.
  - getTableTypeString
```
public String getTableTypeString()
```
    Description copied from class: Dialect
    
    An arbitrary fragment appended to the end of the create table statement.
    
    Overrides:
    
    getTableTypeString in class Dialect
  - hasSelfReferentialForeignKeyBug
```
public boolean hasSelfReferentialForeignKeyBug()
```
    Description copied from class: Dialect
    
    Does the database/driver have bug in deleting rows that refer to other rows being deleted in the same query?
    
    Overrides:
    
    hasSelfReferentialForeignKeyBug in class Dialect
    
    Returns:
    
    true if the database/driver has this bug
  - 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.
  - getDefaultMySQLStorageEngine
```
protected MySQLStorageEngine getDefaultMySQLStorageEngine()
```
  - appendLiteral
```
public void appendLiteral(SqlAppender appender,
                          String literal)
```
    Description copied from class: Dialect
    
    Append a literal string to the given SqlAppender.
    
    Overrides:
    
    appendLiteral in class Dialect
  - 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
  - datetimeFormat
```
public static Replacer datetimeFormat(String format)
```
  - getWriteLockString
```
public String getWriteLockString(int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire pessimistic WRITE locks for this dialect.
    Location of the returned string is treated the same as Dialect.getForUpdateString().
    
    Overrides:
    
    getWriteLockString in class Dialect
    
    Parameters:
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - getWriteLockString
```
public String getWriteLockString(String aliases,
                                 int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire WRITE locks for this dialect, given the aliases of the columns to be write locked.
    Location of the returned string is treated the same as Dialect.getForUpdateString().
    
    Overrides:
    
    getWriteLockString in class Dialect
    
    Parameters:
    
    aliases - The columns to be read locked.
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - getReadLockString
```
public String getReadLockString(int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire READ locks for this dialect.
    Location of the returned string is treated the same as Dialect.getForUpdateString().
    
    Overrides:
    
    getReadLockString in class Dialect
    
    Parameters:
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - getReadLockString
```
public String getReadLockString(String aliases,
                                int timeout)
```
    Description copied from class: Dialect
    
    Get the string to append to SELECT statements to acquire READ locks for this dialect, given the aliases of the columns to be read locked.
    Location of the returned string is treated the same as Dialect.getForUpdateString().
    
    Overrides:
    
    getReadLockString in class Dialect
    
    Parameters:
    
    aliases - The columns to be read locked.
    
    timeout - in milliseconds, -1 for indefinite wait and 0 for no wait.
    
    Returns:
    
    The appropriate LOCK clause string.
  - 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.
  - getForUpdateNowaitString
```
public String getForUpdateNowaitString()
```
    Description copied from class: Dialect
    
    Retrieves the FOR UPDATE NOWAIT syntax specific to this dialect.
    
    Overrides:
    
    getForUpdateNowaitString in class Dialect
    
    Returns:
    
    The appropriate FOR UPDATE NOWAIT clause string.
  - getForUpdateNowaitString
```
public String getForUpdateNowaitString(String aliases)
```
    Description copied from class: Dialect
    
    Get the FOR UPDATE OF column_list NOWAIT fragment appropriate for this dialect, given the aliases of the columns to be write locked.
    
    Overrides:
    
    getForUpdateNowaitString in class Dialect
    
    Parameters:
    
    aliases - The columns to be write locked.
    
    Returns:
    
    The appropriate FOR UPDATE OF colunm_list NOWAIT clause string.
  - getForUpdateString
```
public String getForUpdateString(String aliases)
```
    Description copied from class: Dialect
    
    Get the FOR UPDATE OF column_list fragment appropriate for this dialect, given the aliases of the columns to be write locked.
    
    Overrides:
    
    getForUpdateString in class Dialect
    
    Parameters:
    
    aliases - The columns to be write locked.
    
    Returns:
    
    The appropriate FOR UPDATE OF column_list clause string.
  - 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.
  - supportsRecursiveCTE
```
public boolean supportsRecursiveCTE()
```
    Description copied from class: Dialect
    
    Does this dialect/database support recursive CTEs?
    
    Overrides:
    
    supportsRecursiveCTE in class Dialect
    
    Returns:
    
    true if recursive CTEs are supported
  - supportsSkipLocked
```
public boolean supportsSkipLocked()
```
    Description copied from class: Dialect
    
    Does this dialect support SKIP_LOCKED timeout.
    
    Overrides:
    
    supportsSkipLocked in class Dialect
    
    Returns:
    
    true if SKIP_LOCKED is supported
  - supportsNoWait
```
public boolean supportsNoWait()
```
    Description copied from class: Dialect
    
    Does this dialect support NO_WAIT timeout.
    
    Overrides:
    
    supportsNoWait in class Dialect
    
    Returns:
    
    true if NO_WAIT is supported
  - supportsWait
```
public boolean supportsWait()
```
    Description copied from class: Dialect
    
    Does this dialect support WAIT timeout.
    
    Overrides:
    
    supportsWait in class Dialect
    
    Returns:
    
    true if WAIT is supported
  - getWriteRowLockStrategy
```
public RowLockStrategy getWriteRowLockStrategy()
```
    Description copied from class: Dialect
    
    The row lock strategy to use for write locks.
    
    Overrides:
    
    getWriteRowLockStrategy in class Dialect
  - registerDefaultKeywords
```
protected void registerDefaultKeywords()
```
    Description copied from class: Dialect
    
    Register the reserved words of ANSI-standard SQL as keywords.
    
    Overrides:
    
    registerDefaultKeywords in class Dialect
    
    See Also:
    
    AnsiSqlKeywords
  - getFunctionalDependencyAnalysisSupport
```
public FunctionalDependencyAnalysisSupport getFunctionalDependencyAnalysisSupport()
```
    Description copied from class: Dialect
    
    Get this dialect's level of support for primary key functional dependency analysis within GROUP BY and ORDER BY clauses.
    
    Overrides:
    
    getFunctionalDependencyAnalysisSupport in class Dialect
  - canDisableConstraints
```
public boolean canDisableConstraints()
```
    Description copied from class: Dialect
    
    Is there some way to disable foreign key constraint checking while truncating tables? (If there's no way to do it, and if we can't batch truncate, we must drop and recreate the constraints instead.)
    
    Overrides:
    
    canDisableConstraints in class Dialect
    
    Returns:
    
    true if there is some way to do it
    
    See Also:
    
    Dialect.getDisableConstraintsStatement(), Dialect.getDisableConstraintStatement(String, String)
  - getDisableConstraintsStatement
```
public String getDisableConstraintsStatement()
```
    Description copied from class: Dialect
    
    A SQL statement that temporarily disables foreign key constraint checking for all tables.
    
    Overrides:
    
    getDisableConstraintsStatement in class Dialect
  - getEnableConstraintsStatement
```
public String getEnableConstraintsStatement()
```
    Description copied from class: Dialect
    
    A SQL statement that re-enables foreign key constraint checking for all tables.
    
    Overrides:
    
    getEnableConstraintsStatement in class Dialect

Class MySQLDialect

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

MySQLDialect

MySQLDialect

MySQLDialect

MySQLDialect

MySQLDialect

MySQLDialect

Method Detail

createVersion

getMinimumSupportedVersion

initDefaultProperties

columnType

useMaterializedLobWhenCapacityExceeded

castType

registerColumnTypes

getCharacterSetBytesPerCharacter

getMaxVarcharLength

getMaxVarbinaryLength

isNoBackslashEscapesEnabled

getNullColumnString

getMySQLVersion

getSizeStrategy

getDefaultLobLength

resolveSqlTypeDescriptor

getPreferredSqlTypeCodeForBoolean

initializeFunctionRegistry

contributeTypes

getSqlAstTranslatorFactory

castPattern

getFloatPrecision

currentTimestamp

getFractionalSecondPrecisionInNanos

extractPattern

timestampaddPattern

timestampdiffPattern

supportsTemporalLiteralOffset

appendDateTimeLiteral

appendDateTimeLiteral

appendDateTimeLiteral

getGroupBySelectItemReferenceStrategy

supportsColumnCheck

getEnumTypeDeclaration

getQueryHintString

getSequenceSupport

getViolatedConstraintNameExtractor

qualifyIndexName

getAddForeignKeyConstraintString

getDropForeignKeyString

getDropUniqueKeyString

getAlterColumnTypeString

supportsAlterColumnType

getLimitHandler

closeQuote

openQuote

canCreateCatalog

getCreateCatalogCommand

getDropCatalogCommand

canCreateSchema

getCreateSchemaCommand

getDropSchemaCommand

supportsIfExistsBeforeTableName

getSelectGUIDString

supportsCommentOn

getTableComment

getColumnComment

getNullOrdering

getFallbackSqmMutationStrategy

getFallbackSqmInsertStrategy

getSupportedTemporaryTableKind

getTemporaryTableCreateCommand

getTemporaryTableDropCommand