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MySQLDialect.java
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MySQLDialect.java
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.dialect;
import java.sql.CallableStatement;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.hibernate.LockOptions;
import org.hibernate.PessimisticLockException;
import org.hibernate.boot.model.TypeContributions;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.function.CommonFunctionFactory;
import org.hibernate.dialect.hint.IndexQueryHintHandler;
import org.hibernate.dialect.identity.IdentityColumnSupport;
import org.hibernate.dialect.identity.MySQLIdentityColumnSupport;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.LimitLimitHandler;
import org.hibernate.dialect.sequence.NoSequenceSupport;
import org.hibernate.dialect.sequence.SequenceSupport;
import org.hibernate.dialect.unique.MySQLUniqueDelegate;
import org.hibernate.dialect.unique.UniqueDelegate;
import org.hibernate.engine.jdbc.Size;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
import org.hibernate.engine.jdbc.env.spi.IdentifierCaseStrategy;
import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
import org.hibernate.engine.jdbc.env.spi.IdentifierHelperBuilder;
import org.hibernate.engine.jdbc.env.spi.NameQualifierSupport;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.exception.LockAcquisitionException;
import org.hibernate.exception.LockTimeoutException;
import org.hibernate.exception.spi.SQLExceptionConversionDelegate;
import org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor;
import org.hibernate.exception.spi.ViolatedConstraintNameExtractor;
import org.hibernate.internal.util.JdbcExceptionHelper;
import org.hibernate.metamodel.mapping.EntityMappingType;
import org.hibernate.metamodel.spi.RuntimeModelCreationContext;
import org.hibernate.query.sqm.CastType;
import org.hibernate.query.sqm.IntervalType;
import org.hibernate.query.sqm.NullOrdering;
import org.hibernate.query.sqm.TemporalUnit;
import org.hibernate.query.spi.QueryEngine;
import org.hibernate.query.sqm.function.SqmFunctionRegistry;
import org.hibernate.query.sqm.mutation.internal.temptable.AfterUseAction;
import org.hibernate.dialect.temptable.TemporaryTable;
import org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction;
import org.hibernate.query.sqm.mutation.internal.temptable.LocalTemporaryTableInsertStrategy;
import org.hibernate.query.sqm.mutation.internal.temptable.LocalTemporaryTableMutationStrategy;
import org.hibernate.dialect.temptable.TemporaryTableKind;
import org.hibernate.query.sqm.mutation.spi.SqmMultiTableInsertStrategy;
import org.hibernate.query.sqm.mutation.spi.SqmMultiTableMutationStrategy;
import org.hibernate.query.sqm.produce.function.FunctionParameterType;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.sql.ast.SqlAstTranslator;
import org.hibernate.sql.ast.SqlAstTranslatorFactory;
import org.hibernate.sql.ast.spi.SqlAppender;
import org.hibernate.sql.ast.spi.StandardSqlAstTranslatorFactory;
import org.hibernate.sql.ast.tree.Statement;
import org.hibernate.sql.exec.spi.JdbcOperation;
import org.hibernate.type.BasicTypeRegistry;
import org.hibernate.type.NullType;
import org.hibernate.type.SqlTypes;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.descriptor.java.JavaType;
import org.hibernate.type.descriptor.jdbc.JdbcType;
import org.hibernate.type.descriptor.jdbc.JsonJdbcType;
import org.hibernate.type.descriptor.jdbc.NullJdbcType;
import org.hibernate.type.descriptor.jdbc.spi.JdbcTypeRegistry;
import org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType;
import org.hibernate.type.descriptor.sql.internal.DdlTypeImpl;
import org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry;
import jakarta.persistence.TemporalType;
import static org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor.extractUsingTemplate;
import static org.hibernate.type.SqlTypes.*;
/**
* A {@linkplain Dialect SQL dialect} for MySQL 5.7 and above.
*
* @author Gavin King
*/
public class MySQLDialect extends Dialect {
private static final DatabaseVersion MINIMUM_VERSION = DatabaseVersion.make( 5, 7 );
private final UniqueDelegate uniqueDelegate = new MySQLUniqueDelegate( this );
private final MySQLStorageEngine storageEngine = createStorageEngine();
private final SizeStrategy sizeStrategy = new SizeStrategyImpl() {
@Override
public Size resolveSize(
JdbcType jdbcType,
JavaType<?> javaType,
Integer precision,
Integer scale,
Long length) {
switch ( jdbcType.getDefaultSqlTypeCode() ) {
case Types.BIT:
// MySQL allows BIT with a length up to 64 (less the default length 255)
if ( length != null ) {
return Size.length( Math.min( Math.max( length, 1 ), 64 ) );
}
}
return super.resolveSize( jdbcType, javaType, precision, scale, length );
}
};
private final int maxVarcharLength;
private final int maxVarbinaryLength;
public MySQLDialect() {
this( MINIMUM_VERSION );
}
public MySQLDialect(DatabaseVersion version) {
super( version );
registerKeyword( "key" );
maxVarcharLength = maxVarcharLength( getMySQLVersion(), 4 ); //conservative assumption
maxVarbinaryLength = maxVarbinaryLength( getMySQLVersion() );
}
public MySQLDialect(DialectResolutionInfo info) {
super( info );
int bytesPerCharacter = getCharacterSetBytesPerCharacter( info.getDatabaseMetadata() );
maxVarcharLength = maxVarcharLength( getMySQLVersion(), bytesPerCharacter );
maxVarbinaryLength = maxVarbinaryLength( getMySQLVersion() );
}
@Override
protected DatabaseVersion getMinimumSupportedVersion() {
return MINIMUM_VERSION;
}
@Override
protected void initDefaultProperties() {
super.initDefaultProperties();
getDefaultProperties().setProperty( Environment.MAX_FETCH_DEPTH, "2" );
}
private MySQLStorageEngine createStorageEngine() {
String storageEngine = Environment.getProperties().getProperty( Environment.STORAGE_ENGINE );
if (storageEngine == null) {
storageEngine = System.getProperty( Environment.STORAGE_ENGINE );
}
if (storageEngine == null) {
return getDefaultMySQLStorageEngine();
}
else if( "innodb".equalsIgnoreCase( storageEngine ) ) {
return InnoDBStorageEngine.INSTANCE;
}
else if( "myisam".equalsIgnoreCase( storageEngine ) ) {
return MyISAMStorageEngine.INSTANCE;
}
else {
throw new UnsupportedOperationException( "The " + storageEngine + " storage engine is not supported" );
}
}
@Override
protected String columnType(int sqlTypeCode) {
switch ( sqlTypeCode ) {
case BOOLEAN:
// HHH-6935: Don't use "boolean" i.e. tinyint(1) due to JDBC ResultSetMetaData
return "bit";
case TIMESTAMP:
return "datetime($p)";
case TIMESTAMP_WITH_TIMEZONE:
return "timestamp($p)";
case NUMERIC:
// it's just a synonym
return columnType( DECIMAL );
// the maximum long LOB length is 4_294_967_295, bigger than any Java string
case BLOB:
return "longblob";
case NCLOB:
case CLOB:
return "longtext";
default:
return super.columnType( sqlTypeCode );
}
}
@Override
protected String castType(int sqlTypeCode) {
switch ( sqlTypeCode ) {
case BOOLEAN:
case BIT:
//special case for casting to Boolean
return "unsigned";
case TINYINT:
case SMALLINT:
case INTEGER:
case BIGINT:
//MySQL doesn't let you cast to INTEGER/BIGINT/TINYINT
return "signed";
case FLOAT:
case REAL:
case DOUBLE:
//MySQL doesn't let you cast to DOUBLE/FLOAT
//but don't just return 'decimal' because
//the default scale is 0 (no decimal places)
return "decimal($p,$s)";
case CHAR:
case NCHAR:
case VARCHAR:
case NVARCHAR:
case LONG32VARCHAR:
case LONG32NVARCHAR:
//MySQL doesn't let you cast to TEXT/LONGTEXT
return "char";
case BINARY:
case VARBINARY:
case LONG32VARBINARY:
//MySQL doesn't let you cast to BLOB/TINYBLOB/LONGBLOB
return "binary";
}
return super.castType( sqlTypeCode );
}
@Override
protected void registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry) {
super.registerColumnTypes( typeContributions, serviceRegistry );
final DdlTypeRegistry ddlTypeRegistry = typeContributions.getTypeConfiguration().getDdlTypeRegistry();
// MySQL 5.7 brings JSON native support with a dedicated datatype
// https://dev.mysql.com/doc/refman/5.7/en/json.html
ddlTypeRegistry.addDescriptor( new DdlTypeImpl( JSON, "json", this ) );
ddlTypeRegistry.addDescriptor( new DdlTypeImpl( GEOMETRY, "geometry", this ) );
// MySQL has approximately one million text and blob types. We have
// already registered longtext + longblob via the regular method,
// but we still need to do the rest of them here.
final int maxTinyLobLen = 255;
final int maxLobLen = 65_535;
final int maxMediumLobLen = 16_777_215;
final CapacityDependentDdlType.Builder varcharBuilder = CapacityDependentDdlType.builder(
VARCHAR,
columnType( CLOB ),
"char",
this
)
.withTypeCapacity( getMaxVarcharLength(), "varchar($l)" )
.withTypeCapacity( maxMediumLobLen, "mediumtext" );
if ( getMaxVarcharLength() < maxLobLen ) {
varcharBuilder.withTypeCapacity( maxLobLen, "text" );
}
ddlTypeRegistry.addDescriptor( varcharBuilder.build() );
final CapacityDependentDdlType.Builder nvarcharBuilder = CapacityDependentDdlType.builder(
NVARCHAR,
columnType( NCLOB ),
"char",
this
)
.withTypeCapacity( getMaxVarcharLength(), "varchar($l)" )
.withTypeCapacity( maxMediumLobLen, "mediumtext" );
if ( getMaxVarcharLength() < maxLobLen ) {
nvarcharBuilder.withTypeCapacity( maxLobLen, "text" );
}
ddlTypeRegistry.addDescriptor( nvarcharBuilder.build() );
final CapacityDependentDdlType.Builder varbinaryBuilder = CapacityDependentDdlType.builder(
VARBINARY,
columnType( BLOB ),
"binary",
this
)
.withTypeCapacity( getMaxVarbinaryLength(), "varbinary($l)" )
.withTypeCapacity( maxMediumLobLen, "mediumblob" );
if ( getMaxVarcharLength() < maxLobLen ) {
varbinaryBuilder.withTypeCapacity( maxLobLen, "blob" );
}
ddlTypeRegistry.addDescriptor( varbinaryBuilder.build() );
ddlTypeRegistry.addDescriptor( new DdlTypeImpl( LONG32VARBINARY, columnType( BLOB ), "binary", this ) );
ddlTypeRegistry.addDescriptor( new DdlTypeImpl( LONG32VARCHAR, columnType( CLOB ), "char", this ) );
ddlTypeRegistry.addDescriptor( new DdlTypeImpl( LONG32NVARCHAR, columnType( CLOB ), "char", this ) );
ddlTypeRegistry.addDescriptor(
CapacityDependentDdlType.builder( BLOB, columnType( BLOB ), "binary", this )
.withTypeCapacity( maxTinyLobLen, "tinyblob" )
.withTypeCapacity( maxMediumLobLen, "mediumblob" )
.withTypeCapacity( maxLobLen, "blob" )
.build()
);
ddlTypeRegistry.addDescriptor(
CapacityDependentDdlType.builder( CLOB, columnType( CLOB ), "char", this )
.withTypeCapacity( maxTinyLobLen, "tinytext" )
.withTypeCapacity( maxMediumLobLen, "mediumtext" )
.withTypeCapacity( maxLobLen, "text" )
.build()
);
ddlTypeRegistry.addDescriptor(
CapacityDependentDdlType.builder( NCLOB, columnType( NCLOB ), "char", this )
.withTypeCapacity( maxTinyLobLen, "tinytext" )
.withTypeCapacity( maxMediumLobLen, "mediumtext" )
.withTypeCapacity( maxLobLen, "text" )
.build()
);
}
protected static int getCharacterSetBytesPerCharacter(DatabaseMetaData databaseMetaData) {
if ( databaseMetaData != null ) {
try (java.sql.Statement s = databaseMetaData.getConnection().createStatement() ) {
final ResultSet rs = s.executeQuery( "SELECT @@character_set_database" );
if ( rs.next() ) {
final String characterSet = rs.getString( 1 );
final int collationIndex = characterSet.indexOf( '_' );
// According to https://dev.mysql.com/doc/refman/8.0/en/charset-charsets.html
switch ( collationIndex == -1 ? characterSet : characterSet.substring( 0, collationIndex ) ) {
case "utf16":
case "utf16le":
case "utf32":
case "utf8mb4":
case "gb18030":
return 4;
case "utf8":
case "utf8mb3":
case "eucjpms":
case "ujis":
return 3;
case "ucs2":
case "cp932":
case "big5":
case "euckr":
case "gb2312":
case "gbk":
case "sjis":
return 2;
default:
return 1;
}
}
}
catch (SQLException ex) {
// Ignore
}
}
return 4;
}
private static int maxVarbinaryLength(DatabaseVersion version) {
return 65_535;
}
private static int maxVarcharLength(DatabaseVersion version, int bytesPerCharacter) {
switch ( bytesPerCharacter ) {
case 1:
return 65_535;
case 2:
return 32_767;
case 3:
return 21_844;
case 4:
default:
return 16_383;
}
}
@Override
public int getMaxVarcharLength() {
return maxVarcharLength;
}
@Override
public int getMaxVarbinaryLength() {
return maxVarbinaryLength;
}
@Override
public String getNullColumnString(String columnType) {
// Good job MySQL https://dev.mysql.com/doc/refman/8.0/en/timestamp-initialization.html
// If the explicit_defaults_for_timestamp system variable is enabled, TIMESTAMP columns permit NULL values only if declared with the NULL attribute.
if ( columnType.regionMatches( true, 0, "timestamp", 0, "timestamp".length() ) ) {
return " null";
}
return super.getNullColumnString( columnType );
}
public DatabaseVersion getMySQLVersion() {
return super.getVersion();
}
@Override
public SizeStrategy getSizeStrategy() {
return sizeStrategy;
}
@Override
public long getDefaultLobLength() {
//max length for mediumblob or mediumtext
return 16_777_215;
}
@Override
public JdbcType resolveSqlTypeDescriptor(
String columnTypeName,
int jdbcTypeCode,
int precision,
int scale,
JdbcTypeRegistry jdbcTypeRegistry) {
if ( jdbcTypeCode == Types.BIT ) {
return jdbcTypeRegistry.getDescriptor( Types.BOOLEAN );
}
return super.resolveSqlTypeDescriptor(
columnTypeName,
jdbcTypeCode,
precision,
scale,
jdbcTypeRegistry
);
}
@Override
public int getPreferredSqlTypeCodeForBoolean() {
return Types.BIT;
}
// @Override
// public int getDefaultDecimalPrecision() {
// //this is the maximum, but I guess it's too high
// return 65;
// }
@Override
public void initializeFunctionRegistry(QueryEngine queryEngine) {
super.initializeFunctionRegistry( queryEngine );
CommonFunctionFactory functionFactory = new CommonFunctionFactory(queryEngine);
functionFactory.soundex();
functionFactory.radians();
functionFactory.degrees();
functionFactory.cot();
functionFactory.log();
functionFactory.log2();
functionFactory.log10();
functionFactory.trim2();
functionFactory.octetLength();
functionFactory.reverse();
functionFactory.space();
functionFactory.repeat();
functionFactory.pad_space();
functionFactory.md5();
functionFactory.yearMonthDay();
functionFactory.hourMinuteSecond();
functionFactory.dayofweekmonthyear();
functionFactory.weekQuarter();
functionFactory.daynameMonthname();
functionFactory.lastDay();
functionFactory.date();
functionFactory.timestamp();
time( queryEngine );
functionFactory.utcDateTimeTimestamp();
functionFactory.rand();
functionFactory.crc32();
functionFactory.sha1();
functionFactory.sha2();
functionFactory.sha();
functionFactory.bitLength();
functionFactory.octetLength();
functionFactory.ascii();
functionFactory.instr();
functionFactory.substr();
//also natively supports ANSI-style substring()
functionFactory.position();
functionFactory.nowCurdateCurtime();
functionFactory.truncate();
functionFactory.insert();
functionFactory.bitandorxornot_operator();
functionFactory.bitAndOr();
functionFactory.stddev();
functionFactory.stddevPopSamp();
functionFactory.variance();
functionFactory.varPopSamp();
functionFactory.datediff();
functionFactory.adddateSubdateAddtimeSubtime();
functionFactory.format_dateFormat();
functionFactory.makedateMaketime();
functionFactory.localtimeLocaltimestamp();
BasicTypeRegistry basicTypeRegistry = queryEngine.getTypeConfiguration().getBasicTypeRegistry();
SqmFunctionRegistry functionRegistry = queryEngine.getSqmFunctionRegistry();
functionRegistry.noArgsBuilder( "localtime" )
.setInvariantType(basicTypeRegistry.resolve( StandardBasicTypes.TIMESTAMP ))
.setUseParenthesesWhenNoArgs( false )
.register();
// pi() produces a value with 7 digits unless we're explicit
if ( getMySQLVersion().isSameOrAfter( 8 ) ) {
functionRegistry.patternDescriptorBuilder( "pi", "cast(pi() as double)" )
.setInvariantType( basicTypeRegistry.resolve( StandardBasicTypes.DOUBLE ) )
.setExactArgumentCount( 0 )
.setArgumentListSignature( "" )
.register();
}
else {
// But before MySQL 8, it's not possible to cast to double. Double has a default precision of 53
// and since the internal representation of pi has only 15 decimal places, we cast to decimal(53,15)
functionRegistry.patternDescriptorBuilder( "pi", "cast(pi() as decimal(53,15))" )
.setInvariantType( basicTypeRegistry.resolve( StandardBasicTypes.DOUBLE ) )
.setExactArgumentCount( 0 )
.setArgumentListSignature( "" )
.register();
}
// By default char() produces a binary string, not a character string.
// (Note also that char() is actually a variadic function in MySQL.)
functionRegistry.patternDescriptorBuilder( "chr", "char(?1 using ascii)" )
.setInvariantType(basicTypeRegistry.resolve( StandardBasicTypes.CHARACTER ))
.setExactArgumentCount(1)
.setParameterTypes(FunctionParameterType.INTEGER)
.register();
functionRegistry.registerAlternateKey( "char", "chr" );
// MySQL timestamp type defaults to precision 0 (seconds) but
// we want the standard default precision of 6 (microseconds)
functionFactory.sysdateExplicitMicros();
if ( getMySQLVersion().isSameOrAfter( 8, 2 ) ) {
functionFactory.windowFunctions();
if ( getMySQLVersion().isSameOrAfter( 8, 11 ) ) {
functionFactory.hypotheticalOrderedSetAggregates_windowEmulation();
}
}
functionFactory.listagg_groupConcat();
}
@Override
public void contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry) {
super.contributeTypes( typeContributions, serviceRegistry );
final JdbcTypeRegistry jdbcTypeRegistry = typeContributions.getTypeConfiguration()
.getJdbcTypeRegistry();
jdbcTypeRegistry.addDescriptorIfAbsent( SqlTypes.JSON, JsonJdbcType.INSTANCE );
// MySQL requires a custom binder for binding untyped nulls with the NULL type
typeContributions.contributeJdbcType( NullJdbcType.INSTANCE );
// Until we remove StandardBasicTypes, we have to keep this
typeContributions.contributeType(
new NullType(
NullJdbcType.INSTANCE,
typeContributions.getTypeConfiguration()
.getJavaTypeRegistry()
.getDescriptor( Object.class )
)
);
}
@Override
public SqlAstTranslatorFactory getSqlAstTranslatorFactory() {
return new StandardSqlAstTranslatorFactory() {
@Override
protected <T extends JdbcOperation> SqlAstTranslator<T> buildTranslator(
SessionFactoryImplementor sessionFactory, Statement statement) {
return new MySQLSqlAstTranslator<>( sessionFactory, statement );
}
};
}
@Override
public String castPattern(CastType from, CastType to) {
if ( to == CastType.INTEGER_BOOLEAN ) {
switch ( from ) {
case STRING:
case INTEGER:
case LONG:
case YN_BOOLEAN:
case TF_BOOLEAN:
case BOOLEAN:
break;
default:
// MySQL/MariaDB don't support casting to bit
return "abs(sign(?1))";
}
}
return super.castPattern( from, to );
}
private void time(QueryEngine queryEngine) {
queryEngine.getSqmFunctionRegistry().namedDescriptorBuilder( "time" )
.setExactArgumentCount( 1 )
.setInvariantType(
queryEngine.getTypeConfiguration().getBasicTypeRegistry().resolve( StandardBasicTypes.STRING )
)
.register();
}
@Override
public int getFloatPrecision() {
//according to MySQL docs, this is
//the maximum precision for 4 bytes
return 23;
}
/**
* MySQL 5.7 precision defaults to seconds, but microseconds is better
*/
@Override
public String currentTimestamp() {
return "current_timestamp(6)";
}
// for consistency, we could do this: but I decided not to
// because it seems to me that fractional seconds can't possibly
// be meaningful in a time, as opposed to a timestamp
// @Override
// public String currentTime() {
// return getMySQLVersion().isBefore( 5, 7 ) ? super.currentTimestamp() : "current_time(6)";
// }
/**
* {@code microsecond} is the smallest unit for
* {@code timestampadd()} and {@code timestampdiff()},
* and the highest precision for a {@code timestamp}.
*/
@Override
public long getFractionalSecondPrecisionInNanos() {
return 1_000; //microseconds
}
/**
* 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
* {@link TemporalUnit#DAY_OF_YEAR},
* {@link TemporalUnit#DAY_OF_MONTH},
* {@link TemporalUnit#DAY_OF_YEAR}.
*
* In addition, the field {@link TemporalUnit#SECOND} is
* redefined to include microseconds.
*/
@Override
public String extractPattern(TemporalUnit unit) {
switch (unit) {
case SECOND:
return "(second(?2)+microsecond(?2)/1e6)";
case WEEK:
return "weekofyear(?2)"; //same as week(?2,3), the ISO week
case DAY_OF_WEEK:
return "dayofweek(?2)";
case DAY_OF_MONTH:
return "dayofmonth(?2)";
case DAY_OF_YEAR:
return "dayofyear(?2)";
//TODO: case WEEK_YEAR: yearweek(?2, 3)/100
default:
return "?1(?2)";
}
}
@Override
public String timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType) {
switch (unit) {
case NANOSECOND:
return "timestampadd(microsecond,(?2)/1e3,?3)";
case NATIVE:
return "timestampadd(microsecond,?2,?3)";
default:
return "timestampadd(?1,?2,?3)";
}
}
@Override
public String timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType) {
switch (unit) {
case NANOSECOND:
return "timestampdiff(microsecond,?2,?3)*1e3";
case NATIVE:
return "timestampdiff(microsecond,?2,?3)";
default:
return "timestampdiff(?1,?2,?3)";
}
}
@Override
public boolean supportsUnionAll() {
return true;
}
@Override
public SelectItemReferenceStrategy getGroupBySelectItemReferenceStrategy() {
return SelectItemReferenceStrategy.POSITION;
}
@Override
public boolean supportsColumnCheck() {
return false;
}
@Override
public String getQueryHintString(String query, String hints) {
return IndexQueryHintHandler.INSTANCE.addQueryHints( query, hints );
}
/**
* No support for sequences.
*/
@Override
public SequenceSupport getSequenceSupport() {
return NoSequenceSupport.INSTANCE;
}
public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor() {
return EXTRACTOR;
}
private static final ViolatedConstraintNameExtractor EXTRACTOR =
new TemplatedViolatedConstraintNameExtractor( sqle -> {
final String sqlState = JdbcExceptionHelper.extractSqlState( sqle );
if ( sqlState != null ) {
switch ( Integer.parseInt( sqlState ) ) {
case 23000:
return extractUsingTemplate( " for key '", "'", sqle.getMessage() );
}
}
return null;
} );
@Override
public boolean qualifyIndexName() {
return false;
}
@Override
public String getAddForeignKeyConstraintString(
String constraintName,
String[] foreignKey,
String referencedTable,
String[] primaryKey,
boolean referencesPrimaryKey) {
final String cols = String.join( ", ", foreignKey );
final String referencedCols = String.join( ", ", primaryKey );
return String.format(
" add constraint %s foreign key (%s) references %s (%s)",
constraintName,
cols,
referencedTable,
referencedCols
);
}
@Override
public String getDropForeignKeyString() {
return " drop foreign key ";
}
@Override
public LimitHandler getLimitHandler() {
//also supports LIMIT n OFFSET m
return LimitLimitHandler.INSTANCE;
}
@Override
public char closeQuote() {
return '`';
}
@Override
public char openQuote() {
return '`';
}
@Override
public boolean canCreateCatalog() {
return true;
}
@Override
public String[] getCreateCatalogCommand(String catalogName) {
return new String[] { "create database " + catalogName };
}
@Override
public String[] getDropCatalogCommand(String catalogName) {
return new String[] { "drop database " + catalogName };
}
@Override
public boolean canCreateSchema() {
return false;
}
@Override
public String[] getCreateSchemaCommand(String schemaName) {
throw new UnsupportedOperationException( "MySQL does not support dropping creating/dropping schemas in the JDBC sense" );
}
@Override
public String[] getDropSchemaCommand(String schemaName) {
throw new UnsupportedOperationException( "MySQL does not support dropping creating/dropping schemas in the JDBC sense" );
}
@Override
public boolean supportsIfExistsBeforeTableName() {
return true;
}
@Override
public String getSelectGUIDString() {
return "select uuid()";
}
@Override
public String getTableComment(String comment) {
return " comment='" + comment + "'";
}
@Override
public String getColumnComment(String comment) {
return " comment '" + comment + "'";
}
@Override
public NullOrdering getNullOrdering() {
return NullOrdering.SMALLEST;
}
@Override
public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(
EntityMappingType rootEntityDescriptor,
RuntimeModelCreationContext runtimeModelCreationContext) {
return new LocalTemporaryTableMutationStrategy(
TemporaryTable.createIdTable(
rootEntityDescriptor,
basename -> TemporaryTable.ID_TABLE_PREFIX + basename,
this,
runtimeModelCreationContext
),
runtimeModelCreationContext.getSessionFactory()
);
}
@Override
public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(
EntityMappingType rootEntityDescriptor,
RuntimeModelCreationContext runtimeModelCreationContext) {
return new LocalTemporaryTableInsertStrategy(
TemporaryTable.createEntityTable(
rootEntityDescriptor,
name -> TemporaryTable.ENTITY_TABLE_PREFIX + name,
this,
runtimeModelCreationContext
),
runtimeModelCreationContext.getSessionFactory()
);
}
@Override
public TemporaryTableKind getSupportedTemporaryTableKind() {
return TemporaryTableKind.LOCAL;
}
@Override
public String getTemporaryTableCreateCommand() {
return "create temporary table if not exists";
}
@Override
public String getTemporaryTableDropCommand() {
return "drop temporary table";
}
@Override
public AfterUseAction getTemporaryTableAfterUseAction() {
return AfterUseAction.DROP;
}
@Override
public BeforeUseAction getTemporaryTableBeforeUseAction() {
return BeforeUseAction.CREATE;
}
@Override
public int getMaxAliasLength() {
// Max alias length is 256, but Hibernate needs to add "uniqueing info" so we account for that
return 246;
}
@Override
public int getMaxIdentifierLength() {
return 64;
}
@Override
public boolean supportsCurrentTimestampSelection() {
return true;
}
@Override
public boolean isCurrentTimestampSelectStringCallable() {
return false;
}
@Override
public String getCurrentTimestampSelectString() {
return "select now()";
}
@Override
public int registerResultSetOutParameter(CallableStatement statement, int col) throws SQLException {
return col;
}
@Override
public ResultSet getResultSet(CallableStatement ps) throws SQLException {
boolean isResultSet = ps.execute();
while ( !isResultSet && ps.getUpdateCount() != -1 ) {
isResultSet = ps.getMoreResults();
}
return ps.getResultSet();
}
@Override
public UniqueDelegate getUniqueDelegate() {
return uniqueDelegate;
}
@Override
public boolean supportsNullPrecedence() {
return false;
}
// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@Override
public boolean supportsLobValueChangePropagation() {
// note: at least my local MySQL 5.1 install shows this not working...
return false;
}
@Override
public boolean supportsSubqueryOnMutatingTable() {
return false;
}
@Override
public boolean supportsLockTimeouts() {
// yes, we do handle "lock timeout" conditions in the exception conversion delegate,
// but that's a hardcoded lock timeout period across the whole entire MySQL database.
// MySQL does not support specifying lock timeouts as part of the SQL statement, which is really
// what this meta method is asking.
return false;
}
@Override
public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate() {
return (sqlException, message, sql) -> {
switch ( sqlException.getErrorCode() ) {
case 1205:
case 3572:
return new PessimisticLockException( message, sqlException, sql );
case 1207:
case 1206:
return new LockAcquisitionException( message, sqlException, sql );
}
final String sqlState = JdbcExceptionHelper.extractSqlState( sqlException );
if ( sqlState != null ) {
switch ( sqlState ) {
case "41000":
return new LockTimeoutException( message, sqlException, sql );
case "40001":
return new LockAcquisitionException( message, sqlException, sql );
}
}
return null;
};
}
@Override
public NameQualifierSupport getNameQualifierSupport() {
return NameQualifierSupport.CATALOG;
}
@Override