/*
* 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.Types;
import org.hibernate.LockMode;
import org.hibernate.dialect.lock.LockingStrategy;
import org.hibernate.dialect.lock.OptimisticForceIncrementLockingStrategy;
import org.hibernate.dialect.lock.OptimisticLockingStrategy;
import org.hibernate.dialect.lock.PessimisticForceIncrementLockingStrategy;
import org.hibernate.dialect.lock.PessimisticReadUpdateLockingStrategy;
import org.hibernate.dialect.lock.PessimisticWriteUpdateLockingStrategy;
import org.hibernate.dialect.lock.SelectLockingStrategy;
import org.hibernate.dialect.lock.UpdateLockingStrategy;
import org.hibernate.persister.entity.Lockable;
/**
* An SQL Dialect for Frontbase. Assumes you're using the latest version
* of the FrontBase JDBC driver, available from <tt>http://frontbase.com/</tt>
* <p>
* <b>NOTE</b>: The latest JDBC driver is not always included with the
* latest release of FrontBase. Download the driver separately, and enjoy
* the informative release notes.
* <p>
* This dialect was tested with JDBC driver version 2.3.1. This driver
* contains a bug that causes batches of updates to fail. (The bug should be
* fixed in the next release of the JDBC driver.) If you are using JDBC driver
* 2.3.1, you can work-around this problem by setting the following in your
* <tt>hibernate.properties</tt> file: <tt>hibernate.jdbc.batch_size=15</tt>
*
* @author Ron Lussier <tt>rlussier@lenscraft.com</tt>
*/
public class FrontBaseDialect extends Dialect {
public FrontBaseDialect() {
super();
registerColumnType( Types.BIT, "bit" );
registerColumnType( Types.BIGINT, "longint" );
registerColumnType( Types.SMALLINT, "smallint" );
registerColumnType( Types.TINYINT, "tinyint" );
registerColumnType( Types.INTEGER, "integer" );
registerColumnType( Types.CHAR, "char(1)" );
registerColumnType( Types.VARCHAR, "varchar($l)" );
registerColumnType( Types.FLOAT, "float" );
registerColumnType( Types.DOUBLE, "double precision" );
registerColumnType( Types.DATE, "date" );
registerColumnType( Types.TIME, "time" );
registerColumnType( Types.TIMESTAMP, "timestamp" );
registerColumnType( Types.VARBINARY, "bit varying($l)" );
registerColumnType( Types.NUMERIC, "numeric($p,$s)" );
registerColumnType( Types.BLOB, "blob" );
registerColumnType( Types.CLOB, "clob" );
}
public String getAddColumnString() {
return "add column";
}
public String getCascadeConstraintsString() {
return " cascade";
}
public boolean dropConstraints() {
return false;
}
/**
* Does this dialect support the <tt>FOR UPDATE</tt> syntax. No!
*
* @return false always. FrontBase doesn't support this syntax,
* which was dropped with SQL92
*/
public String getForUpdateString() {
return "";
}
public String getCurrentTimestampCallString() {
// TODO : not sure this is correct, could not find docs on how to do this.
return "{?= call current_timestamp}";
}
public boolean isCurrentTimestampSelectStringCallable() {
return true;
}
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
// Frontbase has no known variation of a "SELECT ... FOR UPDATE" syntax...
if ( lockMode==LockMode.PESSIMISTIC_FORCE_INCREMENT) {
return new PessimisticForceIncrementLockingStrategy( lockable, lockMode);
}
else if ( lockMode==LockMode.PESSIMISTIC_WRITE) {
return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode);
}
else if ( lockMode==LockMode.PESSIMISTIC_READ) {
return new PessimisticReadUpdateLockingStrategy( lockable, lockMode);
}
else if ( lockMode==LockMode.OPTIMISTIC) {
return new OptimisticLockingStrategy( lockable, lockMode);
}
else if ( lockMode==LockMode.OPTIMISTIC_FORCE_INCREMENT) {
return new OptimisticForceIncrementLockingStrategy( lockable, lockMode);
}
else if ( lockMode.greaterThan( LockMode.READ ) ) {
return new UpdateLockingStrategy( lockable, lockMode );
}
else {
return new SelectLockingStrategy( lockable, lockMode );
}
}
}