Hibernate example source code file (H2Dialect.java)
The Hibernate H2Dialect.java source code/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.dialect;
import java.sql.SQLException;
import java.sql.Types;
import org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtracter;
import org.hibernate.exception.spi.ViolatedConstraintNameExtracter;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.function.AvgWithArgumentCastFunction;
import org.hibernate.dialect.function.NoArgSQLFunction;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.type.StandardBasicTypes;
import org.jboss.logging.Logger;
/**
* A dialect compatible with the H2 database.
*
* @author Thomas Mueller
*/
public class H2Dialect extends Dialect {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, H2Dialect.class.getName());
private final String querySequenceString;
public H2Dialect() {
super();
String querySequenceString = "select sequence_name from information_schema.sequences";
try {
// HHH-2300
final Class h2ConstantsClass = ReflectHelper.classForName( "org.h2.engine.Constants" );
final int majorVersion = ( Integer ) h2ConstantsClass.getDeclaredField( "VERSION_MAJOR" ).get( null );
final int minorVersion = ( Integer ) h2ConstantsClass.getDeclaredField( "VERSION_MINOR" ).get( null );
final int buildId = ( Integer ) h2ConstantsClass.getDeclaredField( "BUILD_ID" ).get( null );
if ( buildId < 32 ) {
querySequenceString = "select name from information_schema.sequences";
}
if ( ! ( majorVersion > 1 || minorVersion > 2 || buildId >= 139 ) ) {
LOG.unsupportedMultiTableBulkHqlJpaql( majorVersion, minorVersion, buildId );
}
}
catch ( Exception e ) {
// probably H2 not in the classpath, though in certain app server environments it might just mean we are
// not using the correct classloader
LOG.undeterminedH2Version();
}
this.querySequenceString = querySequenceString;
registerColumnType( Types.BOOLEAN, "boolean" );
registerColumnType( Types.BIGINT, "bigint" );
registerColumnType( Types.BINARY, "binary" );
registerColumnType( Types.BIT, "boolean" );
registerColumnType( Types.CHAR, "char($l)" );
registerColumnType( Types.DATE, "date" );
registerColumnType( Types.DECIMAL, "decimal($p,$s)" );
registerColumnType( Types.NUMERIC, "decimal($p,$s)" );
registerColumnType( Types.DOUBLE, "double" );
registerColumnType( Types.FLOAT, "float" );
registerColumnType( Types.INTEGER, "integer" );
registerColumnType( Types.LONGVARBINARY, "longvarbinary" );
registerColumnType( Types.LONGVARCHAR, "longvarchar" );
registerColumnType( Types.REAL, "real" );
registerColumnType( Types.SMALLINT, "smallint" );
registerColumnType( Types.TINYINT, "tinyint" );
registerColumnType( Types.TIME, "time" );
registerColumnType( Types.TIMESTAMP, "timestamp" );
registerColumnType( Types.VARCHAR, "varchar($l)" );
registerColumnType( Types.VARBINARY, "binary($l)" );
registerColumnType( Types.BLOB, "blob" );
registerColumnType( Types.CLOB, "clob" );
// Aggregations ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
registerFunction( "avg", new AvgWithArgumentCastFunction( "double" ) );
// select topic, syntax from information_schema.help
// where section like 'Function%' order by section, topic
//
// see also -> http://www.h2database.com/html/functions.html
// Numeric Functions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
registerFunction( "acos", new StandardSQLFunction( "acos", StandardBasicTypes.DOUBLE ) );
registerFunction( "asin", new StandardSQLFunction( "asin", StandardBasicTypes.DOUBLE ) );
registerFunction( "atan", new StandardSQLFunction( "atan", StandardBasicTypes.DOUBLE ) );
registerFunction( "atan2", new StandardSQLFunction( "atan2", StandardBasicTypes.DOUBLE ) );
registerFunction( "bitand", new StandardSQLFunction( "bitand", StandardBasicTypes.INTEGER ) );
registerFunction( "bitor", new StandardSQLFunction( "bitor", StandardBasicTypes.INTEGER ) );
registerFunction( "bitxor", new StandardSQLFunction( "bitxor", StandardBasicTypes.INTEGER ) );
registerFunction( "ceiling", new StandardSQLFunction( "ceiling", StandardBasicTypes.DOUBLE ) );
registerFunction( "cos", new StandardSQLFunction( "cos", StandardBasicTypes.DOUBLE ) );
registerFunction( "compress", new StandardSQLFunction( "compress", StandardBasicTypes.BINARY ) );
registerFunction( "cot", new StandardSQLFunction( "cot", StandardBasicTypes.DOUBLE ) );
registerFunction( "decrypt", new StandardSQLFunction( "decrypt", StandardBasicTypes.BINARY ) );
registerFunction( "degrees", new StandardSQLFunction( "degrees", StandardBasicTypes.DOUBLE ) );
registerFunction( "encrypt", new StandardSQLFunction( "encrypt", StandardBasicTypes.BINARY ) );
registerFunction( "exp", new StandardSQLFunction( "exp", StandardBasicTypes.DOUBLE ) );
registerFunction( "expand", new StandardSQLFunction( "compress", StandardBasicTypes.BINARY ) );
registerFunction( "floor", new StandardSQLFunction( "floor", StandardBasicTypes.DOUBLE ) );
registerFunction( "hash", new StandardSQLFunction( "hash", StandardBasicTypes.BINARY ) );
registerFunction( "log", new StandardSQLFunction( "log", StandardBasicTypes.DOUBLE ) );
registerFunction( "log10", new StandardSQLFunction( "log10", StandardBasicTypes.DOUBLE ) );
registerFunction( "pi", new NoArgSQLFunction( "pi", StandardBasicTypes.DOUBLE ) );
registerFunction( "power", new StandardSQLFunction( "power", StandardBasicTypes.DOUBLE ) );
registerFunction( "radians", new StandardSQLFunction( "radians", StandardBasicTypes.DOUBLE ) );
registerFunction( "rand", new NoArgSQLFunction( "rand", StandardBasicTypes.DOUBLE ) );
registerFunction( "round", new StandardSQLFunction( "round", StandardBasicTypes.DOUBLE ) );
registerFunction( "roundmagic", new StandardSQLFunction( "roundmagic", StandardBasicTypes.DOUBLE ) );
registerFunction( "sign", new StandardSQLFunction( "sign", StandardBasicTypes.INTEGER ) );
registerFunction( "sin", new StandardSQLFunction( "sin", StandardBasicTypes.DOUBLE ) );
registerFunction( "tan", new StandardSQLFunction( "tan", StandardBasicTypes.DOUBLE ) );
registerFunction( "truncate", new StandardSQLFunction( "truncate", StandardBasicTypes.DOUBLE ) );
// String Functions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
registerFunction( "ascii", new StandardSQLFunction( "ascii", StandardBasicTypes.INTEGER ) );
registerFunction( "char", new StandardSQLFunction( "char", StandardBasicTypes.CHARACTER ) );
registerFunction( "concat", new VarArgsSQLFunction( StandardBasicTypes.STRING, "(", "||", ")" ) );
registerFunction( "difference", new StandardSQLFunction( "difference", StandardBasicTypes.INTEGER ) );
registerFunction( "hextoraw", new StandardSQLFunction( "hextoraw", StandardBasicTypes.STRING ) );
registerFunction( "insert", new StandardSQLFunction( "lower", StandardBasicTypes.STRING ) );
registerFunction( "left", new StandardSQLFunction( "left", StandardBasicTypes.STRING ) );
registerFunction( "lcase", new StandardSQLFunction( "lcase", StandardBasicTypes.STRING ) );
registerFunction( "ltrim", new StandardSQLFunction( "ltrim", StandardBasicTypes.STRING ) );
registerFunction( "octet_length", new StandardSQLFunction( "octet_length", StandardBasicTypes.INTEGER ) );
registerFunction( "position", new StandardSQLFunction( "position", StandardBasicTypes.INTEGER ) );
registerFunction( "rawtohex", new StandardSQLFunction( "rawtohex", StandardBasicTypes.STRING ) );
registerFunction( "repeat", new StandardSQLFunction( "repeat", StandardBasicTypes.STRING ) );
registerFunction( "replace", new StandardSQLFunction( "replace", StandardBasicTypes.STRING ) );
registerFunction( "right", new StandardSQLFunction( "right", StandardBasicTypes.STRING ) );
registerFunction( "rtrim", new StandardSQLFunction( "rtrim", StandardBasicTypes.STRING ) );
registerFunction( "soundex", new StandardSQLFunction( "soundex", StandardBasicTypes.STRING ) );
registerFunction( "space", new StandardSQLFunction( "space", StandardBasicTypes.STRING ) );
registerFunction( "stringencode", new StandardSQLFunction( "stringencode", StandardBasicTypes.STRING ) );
registerFunction( "stringdecode", new StandardSQLFunction( "stringdecode", StandardBasicTypes.STRING ) );
registerFunction( "stringtoutf8", new StandardSQLFunction( "stringtoutf8", StandardBasicTypes.BINARY ) );
registerFunction( "ucase", new StandardSQLFunction( "ucase", StandardBasicTypes.STRING ) );
registerFunction( "utf8tostring", new StandardSQLFunction( "utf8tostring", StandardBasicTypes.STRING ) );
// Time and Date Functions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
registerFunction( "curdate", new NoArgSQLFunction( "curdate", StandardBasicTypes.DATE ) );
registerFunction( "curtime", new NoArgSQLFunction( "curtime", StandardBasicTypes.TIME ) );
registerFunction( "curtimestamp", new NoArgSQLFunction( "curtimestamp", StandardBasicTypes.TIME ) );
registerFunction( "current_date", new NoArgSQLFunction( "current_date", StandardBasicTypes.DATE ) );
registerFunction( "current_time", new NoArgSQLFunction( "current_time", StandardBasicTypes.TIME ) );
registerFunction( "current_timestamp", new NoArgSQLFunction( "current_timestamp", StandardBasicTypes.TIMESTAMP ) );
registerFunction( "datediff", new StandardSQLFunction( "datediff", StandardBasicTypes.INTEGER ) );
registerFunction( "dayname", new StandardSQLFunction( "dayname", StandardBasicTypes.STRING ) );
registerFunction( "dayofmonth", new StandardSQLFunction( "dayofmonth", StandardBasicTypes.INTEGER ) );
registerFunction( "dayofweek", new StandardSQLFunction( "dayofweek", StandardBasicTypes.INTEGER ) );
registerFunction( "dayofyear", new StandardSQLFunction( "dayofyear", StandardBasicTypes.INTEGER ) );
registerFunction( "monthname", new StandardSQLFunction( "monthname", StandardBasicTypes.STRING ) );
registerFunction( "now", new NoArgSQLFunction( "now", StandardBasicTypes.TIMESTAMP ) );
registerFunction( "quarter", new StandardSQLFunction( "quarter", StandardBasicTypes.INTEGER ) );
registerFunction( "week", new StandardSQLFunction( "week", StandardBasicTypes.INTEGER ) );
// System Functions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
registerFunction( "database", new NoArgSQLFunction( "database", StandardBasicTypes.STRING ) );
registerFunction( "user", new NoArgSQLFunction( "user", StandardBasicTypes.STRING ) );
getDefaultProperties().setProperty( Environment.STATEMENT_BATCH_SIZE, DEFAULT_BATCH_SIZE );
getDefaultProperties().setProperty( Environment.NON_CONTEXTUAL_LOB_CREATION, "true" ); // http://code.google.com/p/h2database/issues/detail?id=235
}
public String getAddColumnString() {
return "add column";
}
public boolean supportsIdentityColumns() {
return true;
}
public String getIdentityColumnString() {
return "generated by default as identity"; // not null is implicit
}
public String getIdentitySelectString() {
return "call identity()";
}
public String getIdentityInsertString() {
return "null";
}
public String getForUpdateString() {
return " for update";
}
public boolean supportsUnique() {
return true;
}
public boolean supportsLimit() {
return true;
}
public String getLimitString(String sql, boolean hasOffset) {
return new StringBuffer( sql.length() + 20 )
.append( sql )
.append( hasOffset ? " limit ? offset ?" : " limit ?" )
.toString();
}
public boolean bindLimitParametersInReverseOrder() {
return true;
}
public boolean bindLimitParametersFirst() {
return false;
}
public boolean supportsIfExistsAfterTableName() {
return true;
}
public boolean supportsSequences() {
return true;
}
public boolean supportsPooledSequences() {
return true;
}
public String getCreateSequenceString(String sequenceName) {
return "create sequence " + sequenceName;
}
public String getDropSequenceString(String sequenceName) {
return "drop sequence " + sequenceName;
}
public String getSelectSequenceNextValString(String sequenceName) {
return "next value for " + sequenceName;
}
public String getSequenceNextValString(String sequenceName) {
return "call next value for " + sequenceName;
}
public String getQuerySequencesString() {
return querySequenceString;
}
public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() {
return EXTRACTER;
}
private static ViolatedConstraintNameExtracter EXTRACTER = new TemplatedViolatedConstraintNameExtracter() {
/**
* Extract the name of the violated constraint from the given SQLException.
*
* @param sqle The exception that was the result of the constraint violation.
* @return The extracted constraint name.
*/
public String extractConstraintName(SQLException sqle) {
String constraintName = null;
// 23000: Check constraint violation: {0}
// 23001: Unique index or primary key violation: {0}
if ( sqle.getSQLState().startsWith( "23" ) ) {
final String message = sqle.getMessage();
int idx = message.indexOf( "violation: " );
if ( idx > 0 ) {
constraintName = message.substring( idx + "violation: ".length() );
}
}
return constraintName;
}
};
@Override
public boolean supportsTemporaryTables() {
return true;
}
@Override
public String getCreateTemporaryTableString() {
return "create cached local temporary table if not exists";
}
@Override
public String getCreateTemporaryTablePostfix() {
// actually 2 different options are specified here:
// 1) [on commit drop] - says to drop the table on transaction commit
// 2) [transactional] - says to not perform an implicit commit of any current transaction
return "on commit drop transactional";
}
@Override
public Boolean performTemporaryTableDDLInIsolation() {
// explicitly create the table using the same connection and transaction
return Boolean.FALSE;
}
@Override
public boolean dropTemporaryTableAfterUse() {
return false;
}
public boolean supportsCurrentTimestampSelection() {
return true;
}
public boolean isCurrentTimestampSelectStringCallable() {
return false;
}
public String getCurrentTimestampSelectString() {
return "call current_timestamp()";
}
public boolean supportsUnionAll() {
return true;
}
// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@Override
public boolean supportsLobValueChangePropogation() {
return false;
}
@Override
public boolean supportsTupleDistinctCounts() {
return false;
}
@Override
public boolean doesReadCommittedCauseWritersToBlockReaders() {
// see http://groups.google.com/group/h2-database/browse_thread/thread/562d8a49e2dabe99?hl=en
return true;
}
}
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