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

All Implemented Interfaces:

ConversionContext

Direct Known Subclasses:

MariaDBDialect, MySQL55Dialect, MySQL57Dialect, MySQL5Dialect, MySQL8Dialect, TiDBDialect
```
public class MySQLDialect
extends Dialect
```
A SQL dialect for MySQL 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

MySQLDialect()

MySQLDialect(DatabaseVersion version)

MySQLDialect(DialectResolutionInfo info)

Method Summary

All Methods Static Methods Instance Methods Concrete 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`	`appendLiteral(SqlAppender appender, String literal)`
`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`	`canCreateCatalog()`	Does this dialect support catalog creation?
`boolean`	`canCreateSchema()`	Does this dialect support schema creation?
`String`	`castPattern(CastType from, CastType to)`	Obtain a pattern for the SQL equivalent to a `cast()` function call.
`protected String`	`castType(int sqlTypeCode)`
`char`	`closeQuote()`	The character specific to this dialect used to close a quoted identifier.
`protected String`	`columnType(int sqlTypeCode)`	The column type name for a given JDBC type code defined in `Types` or `SqlTypes`.
`void`	`contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry)`	Allows the Dialect to contribute additional types
`String`	`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.
`protected static int`	`getCharacterSetBytesPerCharacter(DatabaseMetaData databaseMetaData)`
`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()`	Retrieve the command used to retrieve the current timestamp from the database.
`long`	`getDefaultLobLength()`
`protected MySQLStorageEngine`	`getDefaultMySQLStorageEngine()`
`String[]`	`getDropCatalogCommand(String catalogName)`	Get the SQL command used to drop the named catalog
`String`	`getDropForeignKeyString()`
`String[]`	`getDropSchemaCommand(String schemaName)`	Get the SQL command used to drop the named schema
`SqmMultiTableInsertStrategy`	`getFallbackSqmInsertStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`
`SqmMultiTableMutationStrategy`	`getFallbackSqmMutationStrategy(EntityMappingType rootEntityDescriptor, RuntimeModelCreationContext runtimeModelCreationContext)`
`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`.
`SelectItemReferenceStrategy`	`getGroupBySelectItemReferenceStrategy()`
`IdentityColumnSupport`	`getIdentityColumnSupport()`	Get the appropriate `IdentityColumnSupport`
`LimitHandler`	`getLimitHandler()`	Returns a `LimitHandler` that implements support for `Query.setMaxResults(int)` and `Query.setFirstResult(int)` for this dialect.
`int`	`getMaxAliasLength()`	What is the maximum length Hibernate can use for generated aliases?
`int`	`getMaxIdentifierLength()`	What is the maximum identifier length supported by the dialect?
`int`	`getMaxVarbinaryLength()`	The longest possible length of a `Types.VARBINARY`-like column.
`int`	`getMaxVarcharLength()`	The longest possible length of a `Types.VARCHAR`-like column.
`DatabaseVersion`	`getMySQLVersion()`
`NameQualifierSupport`	`getNameQualifierSupport()`	By default interpret this based on DatabaseMetaData.
`String`	`getNullColumnString(String columnType)`	The keyword used to specify a nullable column.
`NullOrdering`	`getNullOrdering()`	Returns the 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 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 underlying database.
`SequenceSupport`	`getSequenceSupport()`	No support for sequences.
`Dialect.SizeStrategy`	`getSizeStrategy()`
`SqlAstTranslatorFactory`	`getSqlAstTranslatorFactory()`	Return an SqlAstTranslatorFactory specific for the Dialect.
`TemporaryTableKind`	`getSupportedTemporaryTableKind()`
`String`	`getTableComment(String comment)`	Get the comment into a form supported for table definition.
`String`	`getTableTypeString()`
`org.hibernate.query.sqm.mutation.internal.temptable.AfterUseAction`	`getTemporaryTableAfterUseAction()`
`org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction`	`getTemporaryTableBeforeUseAction()`
`String`	`getTemporaryTableCreateCommand()`
`String`	`getTemporaryTableDropCommand()`
`UniqueDelegate`	`getUniqueDelegate()`	Get the UniqueDelegate supported by this dialect
`ViolatedConstraintNameExtractor`	`getViolatedConstraintNameExtractor()`
`String`	`getWriteLockString(int timeout)`	Get the string to append to SELECT statements to acquire 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(QueryEngine queryEngine)`	Initialize the given registry with any dialect-specific functions.
`boolean`	`isCurrentTimestampSelectStringCallable()`	Should the value returned by `Dialect.getCurrentTimestampSelectString()` be treated as callable.
`boolean`	`isJdbcLogWarningsEnabledByDefault()`	Is JDBC statement warning logging enabled by default?
`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()`.
`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.
`JdbcType`	`resolveSqlTypeDescriptor(String columnTypeName, int jdbcTypeCode, int precision, int scale, JdbcTypeRegistry jdbcTypeRegistry)`
`boolean`	`supportsCascadeDelete()`	Does this dialect support cascaded delete on foreign key definitions?
`boolean`	`supportsColumnCheck()`	Does this dialect support column-level check constraints?
`boolean`	`supportsCurrentTimestampSelection()`	Does this dialect support a way to retrieve the database's current timestamp value?
`boolean`	`supportsIfExistsBeforeTableName()`	For dropping a table, can the phrase "if exists" be applied before the table name?
`boolean`	`supportsLateral()`	Does this dialect support the SQL lateral keyword or a proprietary alternative?
`boolean`	`supportsLobValueChangePropagation()`	Does the dialect support propagating changes to LOB values back to the database? Talking about mutating the internal value of the locator as opposed to supplying a new locator instance...
`boolean`	`supportsLockTimeouts()`	Informational metadata about whether this dialect is known to support specifying timeouts for requested lock acquisitions.
`boolean`	`supportsNoWait()`	Does this dialect/database support NO_WAIT timeout.
`boolean`	`supportsNullPrecedence()`
`boolean`	`supportsOffsetInSubquery()`	Does this dialect support offset in subqueries? Ex: select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1 offset 1)
`boolean`	`supportsSkipLocked()`	Does this dialect/database support SKIP_LOCKED timeout.
`boolean`	`supportsSubqueryOnMutatingTable()`	Does this dialect support referencing the table being mutated in a subquery.
`boolean`	`supportsUnionAll()`	Does this dialect support UNION ALL.
`boolean`	`supportsWait()`	Does this dialect/database 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.

Methods inherited from class org.hibernate.dialect.Dialect
addSqlHintOrComment, appendBinaryLiteral, appendBooleanValueString, appendDateTimeLiteral, appendDateTimeLiteral, appendDateTimeLiteral, appendIntervalLiteral, appendLockHint, applyLocksToSql, augmentPhysicalTableTypes, augmentRecognizedTableTypes, currentDate, currentLocalTime, currentLocalTimestamp, currentTime, currentTimestampWithTimeZone, defaultScrollMode, doesReadCommittedCauseWritersToBlockReaders, doesRepeatableReadCauseReadersToBlockWriters, equivalentTypes, escapeComment, forceLobAsLastValue, generatedAs, getAddColumnString, getAddColumnSuffixString, getAddForeignKeyConstraintString, getAddPrimaryKeyConstraintString, getAlterTableString, getAuxiliaryDatabaseObjectExporter, getBooleanCheckCondition, getCallableStatementSupport, getCascadeConstraintsString, getCaseInsensitiveLike, getColumnAliasExtractor, getCreateMultisetTableString, getCreateTableString, getCreateTemporaryTableColumnAnnotation, getCurrentSchemaCommand, getDefaultBatchLoadSizingStrategy, getDefaultDecimalPrecision, getDefaultNonContextualLobCreation, getDefaultProperties, getDefaultStatementBatchSize, getDefaultTimestampPrecision, getDefaultUseGetGeneratedKeys, getDoublePrecision, getDropTableString, getEnumCheckCondition, getForeignKeyExporter, getForUpdateString, getForUpdateString, getForUpdateString, getForUpdateString, getHqlTranslator, getIndexExporter, getInExpressionCountLimit, getKeywords, getLobMergeStrategy, getLockingStrategy, getLockRowIdentifier, getLowercaseFunction, getMaxNVarcharLength, getNationalizationSupport, getNativeIdentifierGeneratorStrategy, getNoColumnsInsertString, getNullColumnString, getQueryHintString, getQuerySequencesString, getReadRowLockStrategy, getResultSet, getResultSet, getSchemaNameResolver, getSelectClauseNullString, getSequenceExporter, getSequenceInformationExtractor, getSqmTranslatorFactory, getTableExporter, getTemporaryTableCreateOptions, getTemporaryTableDdlTransactionHandling, getTemporaryTableExporter, getTemporaryTableTruncateCommand, getTimeZoneSupport, getUniqueKeyExporter, getVersion, hasAlterTable, hasDataTypeBeforeGeneratedAs, inlineLiteral, isAnsiNullOn, isEmptyStringTreatedAsNull, isLockTimeoutParameterized, prependComment, quote, registerDefaultKeywords, registerKeyword, registerKeywords, registerResultSetOutParameter, requiresFloatCastingOfIntegerDivision, requiresParensForTupleCounts, requiresParensForTupleDistinctCounts, resolveSqlTypeLength, supportsBindAsCallableArgument, supportsBitType, supportsCaseInsensitiveLike, supportsCircularCascadeDeleteConstraints, supportsCommentOn, supportsExistsInSelect, supportsExpectedLobUsagePattern, supportsFetchClause, supportsFractionalTimestampArithmetic, supportsIfExistsAfterAlterTable, supportsIfExistsAfterConstraintName, supportsIfExistsAfterTableName, supportsIfExistsBeforeConstraintName, supportsJdbcConnectionLobCreation, supportsNamedParameters, supportsNoColumnsInsert, supportsNonQueryWithCTE, supportsOrderByInSubquery, supportsOrdinalSelectItemReference, supportsOuterJoinForUpdate, supportsParametersInInsertSelect, supportsPartitionBy, supportsResultSetPositionQueryMethodsOnForwardOnlyCursor, supportsSubqueryInSelect, supportsSubselectAsInPredicateLHS, supportsTableCheck, supportsTemporalLiteralOffset, supportsTemporaryTablePrimaryKey, supportsTemporaryTables, supportsTruncateWithCast, supportsTupleCounts, supportsTupleDistinctCounts, supportsUnboundedLobLocatorMaterialization, supportsUnionInSubquery, supportsValuesList, supportsValuesListForInsert, toBooleanValueString, toString, transformSelectString, translateDurationField, translateExtractField, trimPattern, 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(DialectResolutionInfo info)
```
- Method Detail
  - initDefaultProperties
```
protected void initDefaultProperties()
```
    Description copied from class: Dialect
    
    Set appropriate default values for configuration properties.
    
    Overrides:
    
    initDefaultProperties in class Dialect
  - columnType
```
protected String columnType(int sqlTypeCode)
```
    Description copied from class: Dialect
    
    The column type name for a given JDBC type code defined in Types or SqlTypes. This default implementation returns the ANSI-standard type name.
    This method may be overridden by concrete Dialects as an alternative to Dialect.registerColumnTypes(TypeContributions, ServiceRegistry) for simple registrations.
    
    Overrides:
    
    columnType in class Dialect
    
    Parameters:
    
    sqlTypeCode - a SQL type code
    
    Returns:
    
    a column type name, with $l, $p, $s placeholders for length, precision, scale
    
    See Also:
    
    SqlTypes
  - castType
```
protected String castType(int sqlTypeCode)
```
    Overrides:
    
    castType in class Dialect
  - registerColumnTypes
```
protected void registerColumnTypes(TypeContributions typeContributions,
                                   ServiceRegistry serviceRegistry)
```
    Description copied from class: Dialect
    
    Register ANSI-standard column types using the length limits defined by Dialect.getMaxVarcharLength(), Dialect.getMaxNVarcharLength(), and Dialect.getMaxVarbinaryLength().
    This method is always called when a Dialect is instantiated.
    
    Overrides:
    
    registerColumnTypes in class Dialect
  - getCharacterSetBytesPerCharacter
```
protected static int getCharacterSetBytesPerCharacter(DatabaseMetaData databaseMetaData)
```
  - getMaxVarcharLength
```
public int getMaxVarcharLength()
```
    Description copied from class: Dialect
    
    The longest possible length of a Types.VARCHAR-like column. For longer column lengths, use some sort of text-like type for the column.
    
    Overrides:
    
    getMaxVarcharLength in class Dialect
  - getMaxVarbinaryLength
```
public int getMaxVarbinaryLength()
```
    Description copied from class: Dialect
    
    The longest possible length of a Types.VARBINARY-like column. For longer column lengths, use some sort of image-like type for the column.
    
    Overrides:
    
    getMaxVarbinaryLength in class Dialect
  - getNullColumnString
```
public String getNullColumnString(String columnType)
```
    Description copied from class: Dialect
    
    The keyword used to specify a nullable column.
    
    Overrides:
    
    getNullColumnString in class Dialect
    
    Returns:
    
    String
  - getMySQLVersion
```
public DatabaseVersion getMySQLVersion()
```
  - getSizeStrategy
```
public Dialect.SizeStrategy getSizeStrategy()
```
    Overrides:
    
    getSizeStrategy in class Dialect
  - getDefaultLobLength
```
public long getDefaultLobLength()
```
    Overrides:
    
    getDefaultLobLength in class Dialect
  - resolveSqlTypeDescriptor
```
public JdbcType resolveSqlTypeDescriptor(String columnTypeName,
                                         int jdbcTypeCode,
                                         int precision,
                                         int scale,
                                         JdbcTypeRegistry jdbcTypeRegistry)
```
    Overrides:
    
    resolveSqlTypeDescriptor in class Dialect
  - 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(QueryEngine queryEngine)
```
    Description copied from class: Dialect
    Initialize the given registry with any dialect-specific functions.
    Support for certain SQL functions is required, and if the database does not support a required function, then the dialect must define a way to emulate it.
    These required functions include the functions defined by the JPA query language specification:
    
    avg(arg) - aggregate function
    count([distinct ]arg) - aggregate function
    max(arg) - aggregate function
    min(arg) - aggregate function
    sum(arg) - aggregate function
    
    coalesce(arg0, arg1, ...)
    nullif(arg0, arg1)
    
    lower(arg)
    upper(arg)
    length(arg)
    concat(arg0, arg1, ...)
    locate(pattern, string[, start])
    substring(string, start[, length])
    trim([[spec ][character ]from] string)
    
    abs(arg)
    mod(arg0, arg1)
    sqrt(arg)
    
    current date
    current time
    current timestamp
    Along with an additional set of functions defined by ANSI SQL:
    
    any(arg) - aggregate function
    every(arg) - aggregate function
    
    cast(arg as Type)
    extract(field from arg)
    
    ln(arg)
    exp(arg)
    power(arg0, arg1)
    floor(arg)
    ceiling(arg)
    
    position(pattern in string)
    substring(string from start[ for length])
    overlay(string placing replacement from start[ for length])
    And the following functions for working with java.time types:
    
    local date
    local time
    local datetime
    offset datetime
    instant
    And a number of additional "standard" functions:
    
    left(string, length)
    right(string, length)
    replace(string, pattern, replacement)
    pad(string with length spec[ character])
    
    log10(arg)
    sign(arg)
    sin(arg)
    cos(arg)
    tan(arg)
    asin(arg)
    acos(arg)
    atan(arg)
    atan2(arg0, arg1)
    round(arg0, arg1)
    least(arg0, arg1, ...)
    greatest(arg0, arg1, ...)
    
    format(datetime as pattern)
    collate(string as collation)
    str(arg) - synonym of cast(a as String)
    ifnull(arg0, arg1) - synonym of coalesce(a, b)
    Finally, the following functions are defined as abbreviations for extract(), and desugared by the parser:
    
    second(arg) - synonym of extract(second from a)
    minute(arg) - synonym of extract(minute from a)
    hour(arg) - synonym of extract(hour from a)
    day(arg) - synonym of extract(day from a)
    month(arg) - synonym of extract(month from a)
    year(arg) - synonym of extract(year from a)
    Note that according to this definition, the second() function returns a floating point value, contrary to the integer type returned by the native function with this name on many databases. Thus, we don't just naively map these HQL functions to the native SQL functions with the same names.
    Overrides:
    
    initializeFunctionRegistry in class Dialect
  - 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
  - getSqlAstTranslatorFactory
```
public SqlAstTranslatorFactory getSqlAstTranslatorFactory()
```
    Description copied from class: Dialect
    
    Return an SqlAstTranslatorFactory specific for the Dialect. Return null to use Hibernate's standard translator.
    
    Overrides:
    
    getSqlAstTranslatorFactory in class Dialect
    
    See Also:
    
    StandardSqlAstTranslatorFactory, JdbcEnvironment.getSqlAstTranslatorFactory()
  - 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
  - supportsUnionAll
```
public boolean supportsUnionAll()
```
    Description copied from class: Dialect
    
    Does this dialect support UNION ALL.
    
    Overrides:
    
    supportsUnionAll in class Dialect
    
    Returns:
    
    True if UNION ALL is supported; false otherwise.
  - getGroupBySelectItemReferenceStrategy
```
public SelectItemReferenceStrategy getGroupBySelectItemReferenceStrategy()
```
    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.
  - getQueryHintString
```
public String getQueryHintString(String query,
                                 String hints)
```
    Description copied from class: Dialect
    
    Apply a hint to the query. The entire query is provided, allowing the Dialect full control over the placement and syntax of the hint. By default, ignore the hint and simply return the query.
    
    Overrides:
    
    getQueryHintString in class Dialect
    
    Parameters:
    
    query - The query to which to apply the hint.
    
    hints - The hints to apply
    
    Returns:
    
    The modified SQL
  - getSequenceSupport
```
public SequenceSupport getSequenceSupport()
```
    No support for sequences.
    
    Overrides:
    
    getSequenceSupport in class Dialect
  - getViolatedConstraintNameExtractor
```
public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor()
```
    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:
    
    boolean
  - 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.
    
    Overrides:
    
    getAddForeignKeyConstraintString in class Dialect
    
    Parameters:
    
    constraintName - The FK constraint name.
    
    foreignKey - The names of the columns comprising the FK
    
    referencedTable - The table referenced by the FK
    
    primaryKey - The explicit columns in the referencedTable referenced by this FK.
    
    referencesPrimaryKey - if false, constraint should be explicit about which column names the constraint refers to
    
    Returns:
    
    the "add FK" fragment
  - getDropForeignKeyString
```
public String getDropForeignKeyString()
```
    Overrides:
    
    getDropForeignKeyString in class Dialect
  - getLimitHandler
```
public LimitHandler getLimitHandler()
```
    Description copied from class: Dialect
    
    Returns a LimitHandler that implements support for Query.setMaxResults(int) and Query.setFirstResult(int) for this dialect.
    
    Overrides:
    
    getLimitHandler in class Dialect
  - 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's 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's specific open quote character.
  - canCreateCatalog
```
public boolean canCreateCatalog()
```
    Description copied from class: Dialect
    
    Does this dialect support catalog creation?
    
    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 schema creation?
    
    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?
    NOTE : Only one or the other (or neither) of this and Dialect.supportsIfExistsAfterTableName() should return true
    
    Overrides:
    
    supportsIfExistsBeforeTableName in class Dialect
    
    Returns:
    
    true if the "if exists" can be applied before the table name
  - getSelectGUIDString
```
public String getSelectGUIDString()
```
    Description copied from class: Dialect
    
    Get the command used to select a GUID from the underlying database.
    Optional operation.
    
    Overrides:
    
    getSelectGUIDString in class Dialect
    
    Returns:
    
    The appropriate command.
  - 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 ordering of null.
    
    Overrides:
    
    getNullOrdering 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
  - getSupportedTemporaryTableKind
```
public TemporaryTableKind getSupportedTemporaryTableKind()
```
    Overrides:
    
    getSupportedTemporaryTableKind in class Dialect
  - getTemporaryTableCreateCommand
```
public String getTemporaryTableCreateCommand()
```
    Overrides:
    
    getTemporaryTableCreateCommand in class Dialect
  - getTemporaryTableDropCommand
```
public String getTemporaryTableDropCommand()
```
    Overrides:
    
    getTemporaryTableDropCommand in class Dialect
  - getTemporaryTableAfterUseAction
```
public org.hibernate.query.sqm.mutation.internal.temptable.AfterUseAction getTemporaryTableAfterUseAction()
```
    Overrides:
    
    getTemporaryTableAfterUseAction in class Dialect
  - getTemporaryTableBeforeUseAction
```
public org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction getTemporaryTableBeforeUseAction()
```
    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?
    The maximum here should account for the fact that Hibernate often needs to append "uniqueing" information to the end of generated aliases. That "uniqueing" information will be added to the end of a identifier generated to the length specified here; so be sure to leave some room (generally speaking 5 positions will suffice).
    
    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 the dialect?
    
    Overrides:
    
    getMaxIdentifierLength in class Dialect
    
    Returns:
    
    The maximum length.
  - supportsCurrentTimestampSelection
```
public boolean supportsCurrentTimestampSelection()
```
    Description copied from class: Dialect
    
    Does this dialect support a way to retrieve the database's current timestamp value?
    
    Overrides:
    
    supportsCurrentTimestampSelection in class Dialect
    
    Returns:
    
    True if the current timestamp can be retrieved; false otherwise.
  - isCurrentTimestampSelectStringCallable
```
public boolean isCurrentTimestampSelectStringCallable()
```
    Description copied from class: Dialect
    
    Should the value returned by Dialect.getCurrentTimestampSelectString() be treated as callable. Typically this indicates that JDBC escape syntax is being used...
    
    Overrides:
    
    isCurrentTimestampSelectStringCallable in class Dialect
    
    Returns:
    
    True if the Dialect.getCurrentTimestampSelectString() return is callable; false otherwise.
  - getCurrentTimestampSelectString
```
public String getCurrentTimestampSelectString()
```
    Description copied from class: Dialect
    
    Retrieve the command used to retrieve the current timestamp from the database.
    
    Overrides:
    
    getCurrentTimestampSelectString in class Dialect
    
    Returns:
    
    The command.
  - 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.
  - getUniqueDelegate
```
public UniqueDelegate getUniqueDelegate()
```
    Description copied from class: Dialect
    
    Get the UniqueDelegate supported by this dialect
    
    Overrides:
    
    getUniqueDelegate in class Dialect
    
    Returns:
    
    The UniqueDelegate
  - supportsNullPrecedence
```
public boolean supportsNullPrecedence()
```
    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).
    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.
  - 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 a DELETE query. And so can that table then be referenced in a subquery of said UPDATE/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
    
    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.
  - 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
  - getNameQualifierSupport
```
public NameQualifierSupport getNameQualifierSupport()
```
    Description copied from class: Dialect
    
    By default interpret this based on DatabaseMetaData.
    
    Overrides:
    
    getNameQualifierSupport in class Dialect
    
    Returns:
    
    The NameQualifierSupport.
  - 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()
  - getIdentityColumnSupport
```
public IdentityColumnSupport getIdentityColumnSupport()
```
    Description copied from class: Dialect
    
    Get the appropriate IdentityColumnSupport
    
    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 cascaded delete on foreign key definitions?
    
    Overrides:
    
    supportsCascadeDelete in class Dialect
    
    Returns:
    
    true indicates that the dialect does support cascaded delete on foreign keys.
  - getTableTypeString
```
public String getTableTypeString()
```
    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)
```
    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 all of the pattern letter sequences understood by DateTimeFormatter, only the following subset of pattern letters is accepted by Hibernate:
    
    G: era
    
    y: year of era
    
    Y: year of week-based year
    
    M: month of year
    
    w: week of week-based year (ISO week number)
    
    W: week of month
    
    E: day of week (name)
    
    e: day of week (number)
    
    d: day of month
    
    D: day of year
    
    a: AM/PM
    
    H: hour of day (24 hour time)
    
    h: hour of AM/PM (12 hour time)
    
    m: minutes
    
    s: seconds
    
    z,Z,x: timezone offset
    
    In addition, punctuation characters and single-quoted literal strings are accepted.
    Appends a pattern accepted by the function that formats dates and times in this dialect to a SQL fragment that is being constructed.
    Overrides:
    
    appendDatetimeFormat in class Dialect
  - 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 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.
  - 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 of the returned string is treated the same as 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 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 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? Ex: select * from Table1 where col1 in (select col1 from Table2 order by col2 limit 1 offset 1)
    
    Overrides:
    
    supportsOffsetInSubquery in class Dialect
    
    Returns:
    
    boolean
  - supportsWindowFunctions
```
public boolean supportsWindowFunctions()
```
    Description copied from class: Dialect
    
    Does this dialect support window functions like row_number() over (..)?
    
    Overrides:
    
    supportsWindowFunctions in class Dialect
    
    Returns:
    
    true if the underlying database supports window functions, false otherwise. The default is false.
  - 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.
  - supportsSkipLocked
```
public boolean supportsSkipLocked()
```
    Description copied from class: Dialect
    
    Does this dialect/database 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/database 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/database 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

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

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

Method Detail

initDefaultProperties

columnType

castType

registerColumnTypes

getCharacterSetBytesPerCharacter

getMaxVarcharLength

getMaxVarbinaryLength

getNullColumnString

getMySQLVersion

getSizeStrategy

getDefaultLobLength

resolveSqlTypeDescriptor

getPreferredSqlTypeCodeForBoolean

initializeFunctionRegistry

contributeTypes

getSqlAstTranslatorFactory

castPattern

getFloatPrecision

currentTimestamp

getFractionalSecondPrecisionInNanos

extractPattern

timestampaddPattern

timestampdiffPattern

supportsUnionAll

getGroupBySelectItemReferenceStrategy

supportsColumnCheck

getQueryHintString

getSequenceSupport

getViolatedConstraintNameExtractor

qualifyIndexName

getAddForeignKeyConstraintString

getDropForeignKeyString

getLimitHandler

closeQuote

openQuote

canCreateCatalog

getCreateCatalogCommand

getDropCatalogCommand

canCreateSchema

getCreateSchemaCommand

getDropSchemaCommand

supportsIfExistsBeforeTableName

getSelectGUIDString

getTableComment

getColumnComment

getNullOrdering

getFallbackSqmMutationStrategy

getFallbackSqmInsertStrategy

getSupportedTemporaryTableKind

getTemporaryTableCreateCommand

getTemporaryTableDropCommand

getTemporaryTableAfterUseAction

getTemporaryTableBeforeUseAction

getMaxAliasLength

getMaxIdentifierLength

supportsCurrentTimestampSelection

isCurrentTimestampSelectStringCallable

getCurrentTimestampSelectString

registerResultSetOutParameter

getResultSet

getUniqueDelegate

supportsNullPrecedence

supportsLobValueChangePropagation

supportsSubqueryOnMutatingTable

supportsLockTimeouts

buildSQLExceptionConversionDelegate