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Hibernate's community supported dialects
/*
* 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 .
*/
package org.hibernate.community.dialect;
import java.sql.Types;
import org.hibernate.boot.model.FunctionContributions;
import org.hibernate.boot.model.TypeContributions;
import org.hibernate.community.dialect.identity.CUBRIDIdentityColumnSupport;
import org.hibernate.community.dialect.sequence.CUBRIDSequenceSupport;
import org.hibernate.community.dialect.sequence.SequenceInformationExtractorCUBRIDDatabaseImpl;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.OracleDialect;
import org.hibernate.dialect.SimpleDatabaseVersion;
import org.hibernate.dialect.TimeZoneSupport;
import org.hibernate.dialect.function.CommonFunctionFactory;
import org.hibernate.dialect.identity.IdentityColumnSupport;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.LimitLimitHandler;
import org.hibernate.dialect.sequence.SequenceSupport;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.query.SemanticException;
import org.hibernate.query.sqm.IntervalType;
import org.hibernate.query.sqm.TemporalUnit;
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.tool.schema.extract.spi.SequenceInformationExtractor;
import org.hibernate.type.descriptor.jdbc.JdbcType;
import org.hibernate.type.descriptor.jdbc.spi.JdbcTypeRegistry;
import org.hibernate.type.descriptor.sql.internal.BinaryFloatDdlType;
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.query.sqm.TemporalUnit.HOUR;
import static org.hibernate.query.sqm.TemporalUnit.MINUTE;
import static org.hibernate.query.sqm.TemporalUnit.NANOSECOND;
import static org.hibernate.query.sqm.TemporalUnit.NATIVE;
import static org.hibernate.query.sqm.TemporalUnit.SECOND;
import static org.hibernate.type.SqlTypes.BINARY;
import static org.hibernate.type.SqlTypes.BLOB;
import static org.hibernate.type.SqlTypes.BOOLEAN;
import static org.hibernate.type.SqlTypes.TIMESTAMP;
import static org.hibernate.type.SqlTypes.TIMESTAMP_WITH_TIMEZONE;
import static org.hibernate.type.SqlTypes.TIME_WITH_TIMEZONE;
import static org.hibernate.type.SqlTypes.TINYINT;
import static org.hibernate.type.SqlTypes.VARBINARY;
/**
* An SQL dialect for CUBRID (8.3.x and later).
*
* @author Seok Jeong Il
*/
public class CUBRIDDialect extends Dialect {
/**
* Constructs a CUBRIDDialect
*/
public CUBRIDDialect() {
super( SimpleDatabaseVersion.ZERO_VERSION );
}
@Override
protected String columnType(int sqlTypeCode) {
switch ( sqlTypeCode ) {
case BOOLEAN:
return "bit";
case TINYINT:
return "smallint";
//'timestamp' has a very limited range
//'datetime' does not support explicit precision
//(always 3, millisecond precision)
case TIMESTAMP:
return "datetime";
case TIME_WITH_TIMEZONE:
case TIMESTAMP_WITH_TIMEZONE:
return "datetimetz";
default:
return super.columnType( sqlTypeCode );
}
}
@Override
protected void registerColumnTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry) {
super.registerColumnTypes( typeContributions, serviceRegistry );
final DdlTypeRegistry ddlTypeRegistry = typeContributions.getTypeConfiguration().getDdlTypeRegistry();
//precision of a Mimer 'float(p)' represents
//decimal digits instead of binary digits
ddlTypeRegistry.addDescriptor( new BinaryFloatDdlType( this ) );
//CUBRID has no 'binary' nor 'varbinary', but 'bit' is
//intended to be used for binary data (unfortunately the
//length parameter is measured in bits, not bytes)
ddlTypeRegistry.addDescriptor( new DdlTypeImpl( BINARY, "bit($l)", this ) );
ddlTypeRegistry.addDescriptor(
CapacityDependentDdlType.builder(
VARBINARY,
CapacityDependentDdlType.LobKind.BIGGEST_LOB,
columnType( BLOB ),
this
)
.withTypeCapacity( getMaxVarbinaryLength(), "bit varying($l)" )
.build()
);
}
@Override
protected void registerDefaultKeywords() {
super.registerDefaultKeywords();
registerKeyword( "TYPE" );
registerKeyword( "YEAR" );
registerKeyword( "MONTH" );
registerKeyword( "ALIAS" );
registerKeyword( "VALUE" );
registerKeyword( "FIRST" );
registerKeyword( "ROLE" );
registerKeyword( "CLASS" );
registerKeyword( "BIT" );
registerKeyword( "TIME" );
registerKeyword( "QUERY" );
registerKeyword( "DATE" );
registerKeyword( "USER" );
registerKeyword( "ACTION" );
registerKeyword( "SYS_USER" );
registerKeyword( "ZONE" );
registerKeyword( "LANGUAGE" );
registerKeyword( "DICTIONARY" );
registerKeyword( "DATA" );
registerKeyword( "TEST" );
registerKeyword( "SUPERCLASS" );
registerKeyword( "SECTION" );
registerKeyword( "LOWER" );
registerKeyword( "LIST" );
registerKeyword( "OID" );
registerKeyword( "DAY" );
registerKeyword( "IF" );
registerKeyword( "ATTRIBUTE" );
registerKeyword( "STRING" );
registerKeyword( "SEARCH" );
}
public CUBRIDDialect(DialectResolutionInfo info) {
this();
registerKeywords( info );
}
@Override
public int getDefaultStatementBatchSize() {
return 15;
}
@Override
public int getMaxVarcharLength() {
return 1_073_741_823;
}
@Override
public int getMaxVarbinaryLength() {
//note that the length of BIT VARYING in CUBRID is actually in bits
return 1_073_741_823;
}
@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;
}
//not used for anything right now, but it
//could be used for timestamp literal format
@Override
public int getDefaultTimestampPrecision() {
return 3;
}
@Override
public int getFloatPrecision() {
return 21; // -> 7 decimal digits
}
@Override
public void initializeFunctionRegistry(FunctionContributions functionContributions) {
super.initializeFunctionRegistry(functionContributions);
CommonFunctionFactory functionFactory = new CommonFunctionFactory(functionContributions);
functionFactory.trim2();
functionFactory.space();
functionFactory.reverse();
functionFactory.repeat();
functionFactory.crc32();
functionFactory.cot();
functionFactory.log2();
functionFactory.log10();
functionFactory.pi();
//rand() returns an integer between 0 and 231 on CUBRID
// functionFactory.rand();
functionFactory.radians();
functionFactory.degrees();
functionFactory.systimestamp();
//TODO: CUBRID also has systime()/sysdate() returning TIME/DATE
functionFactory.localtimeLocaltimestamp();
functionFactory.hourMinuteSecond();
functionFactory.yearMonthDay();
functionFactory.dayofweekmonthyear();
functionFactory.lastDay();
functionFactory.weekQuarter();
functionFactory.octetLength();
functionFactory.bitLength();
functionFactory.md5();
functionFactory.trunc();
// functionFactory.truncate();
functionFactory.toCharNumberDateTimestamp();
functionFactory.substr();
//also natively supports ANSI-style substring()
functionFactory.instr();
functionFactory.translate();
functionFactory.ceiling_ceil();
functionFactory.sha1();
functionFactory.sha2();
functionFactory.ascii();
functionFactory.char_chr();
functionFactory.position();
// functionFactory.concat_pipeOperator();
functionFactory.insert();
functionFactory.nowCurdateCurtime();
functionFactory.makedateMaketime();
functionFactory.bitandorxornot_bitAndOrXorNot();
functionFactory.median();
functionFactory.stddev();
functionFactory.stddevPopSamp();
functionFactory.variance();
functionFactory.varPopSamp();
functionFactory.datediff();
functionFactory.adddateSubdateAddtimeSubtime();
functionFactory.addMonths();
functionFactory.monthsBetween();
functionFactory.rownumInstOrderbyGroupbyNum();
}
@Override
public boolean supportsColumnCheck() {
return false;
}
@Override
public SequenceSupport getSequenceSupport() {
return CUBRIDSequenceSupport.INSTANCE;
}
@Override
public String getDropForeignKeyString() {
return "drop foreign key";
}
@Override
public String getDropUniqueKeyString() {
return "drop index";
}
@Override
public boolean qualifyIndexName() {
return false;
}
@Override
public boolean supportsExistsInSelect() {
return false;
}
@Override
public String getQuerySequencesString() {
return "select * from db_serial";
}
@Override
public SequenceInformationExtractor getSequenceInformationExtractor() {
return SequenceInformationExtractorCUBRIDDatabaseImpl.INSTANCE;
}
@Override
public char openQuote() {
return '[';
}
@Override
public char closeQuote() {
return ']';
}
@Override
public String getForUpdateString() {
return "";
}
@Override
public boolean supportsCurrentTimestampSelection() {
return true;
}
@Override
public String getCurrentTimestampSelectString() {
return "select now()";
}
@Override
public boolean isCurrentTimestampSelectStringCallable() {
return false;
}
@Override
public boolean supportsIfExistsBeforeTableName() {
return true;
}
@Override
public boolean supportsTupleDistinctCounts() {
return false;
}
@Override
public boolean supportsOffsetInSubquery() {
return true;
}
@Override
public boolean supportsTemporaryTables() {
return false;
}
@Override
public SqlAstTranslatorFactory getSqlAstTranslatorFactory() {
return new StandardSqlAstTranslatorFactory() {
@Override
protected SqlAstTranslator buildTranslator(
SessionFactoryImplementor sessionFactory, Statement statement) {
return new CUBRIDSqlAstTranslator<>( sessionFactory, statement );
}
};
}
@Override
public LimitHandler getLimitHandler() {
return LimitLimitHandler.INSTANCE;
}
@Override
public IdentityColumnSupport getIdentityColumnSupport() {
return CUBRIDIdentityColumnSupport.INSTANCE;
}
@Override
public boolean supportsPartitionBy() {
return true;
}
@Override
public void appendDatetimeFormat(SqlAppender appender, String format) {
//I do not know if CUBRID supports FM, but it
//seems that it does pad by default, so it needs it!
appender.appendSql(
OracleDialect.datetimeFormat( format, true, false )
.replace("SSSSSS", "FF")
.replace("SSSSS", "FF")
.replace("SSSS", "FF")
.replace("SSS", "FF")
.replace("SS", "FF")
.replace("S", "FF")
.result()
);
}
@Override
public long getFractionalSecondPrecisionInNanos() {
return 1_000_000; //milliseconds
}
/**
* CUBRID 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 milliseconds.
*/
@Override
public String extractPattern(TemporalUnit unit) {
switch (unit) {
case SECOND:
return "(second(?2)+extract(millisecond from ?2)/1e3)";
case DAY_OF_WEEK:
return "dayofweek(?2)";
case DAY_OF_MONTH:
return "dayofmonth(?2)";
case DAY_OF_YEAR:
return "dayofyear(?2)";
case WEEK:
return "week(?2,3)"; //mode 3 is the ISO week
default:
return "?1(?2)";
}
}
@Override
public TimeZoneSupport getTimeZoneSupport() {
return TimeZoneSupport.NATIVE;
}
@Override
public String timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType) {
switch (unit) {
case NANOSECOND:
return "adddate(?3,interval (?2)/1e6 millisecond)";
case NATIVE:
return "adddate(?3,interval ?2 millisecond)";
default:
return "adddate(?3,interval ?2 ?1)";
}
}
@Override
public String timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType) {
StringBuilder pattern = new StringBuilder();
switch ( unit ) {
case DAY:
//note: datediff() is backwards on CUBRID
return "datediff(?3,?2)";
case HOUR:
timediff(pattern, HOUR, unit);
break;
case MINUTE:
pattern.append("(");
timediff(pattern, MINUTE, unit);
pattern.append("+");
timediff(pattern, HOUR, unit);
pattern.append(")");
break;
case SECOND:
pattern.append("(");
timediff(pattern, SECOND, unit);
pattern.append("+");
timediff(pattern, MINUTE, unit);
pattern.append("+");
timediff(pattern, HOUR, unit);
pattern.append(")");
break;
case NATIVE:
case NANOSECOND:
pattern.append("(");
timediff(pattern, unit, unit);
pattern.append("+");
timediff(pattern, SECOND, unit);
pattern.append("+");
timediff(pattern, MINUTE, unit);
pattern.append("+");
timediff(pattern, HOUR, unit);
pattern.append(")");
break;
default:
throw new SemanticException("unsupported temporal unit for CUBRID: " + unit);
}
return pattern.toString();
}
private void timediff(
StringBuilder sqlAppender,
TemporalUnit diffUnit,
TemporalUnit toUnit) {
if ( diffUnit == NANOSECOND ) {
sqlAppender.append("1e6*");
}
sqlAppender.append("extract(");
if ( diffUnit == NANOSECOND || diffUnit == NATIVE ) {
sqlAppender.append("millisecond");
}
else {
sqlAppender.append("?1");
}
//note: timediff() is backwards on CUBRID
sqlAppender.append(",timediff(?3,?2))");
sqlAppender.append( diffUnit.conversionFactor( toUnit, this ) );
}
}
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