org.hibernate.id.GUIDGenerator Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
*
* 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.id;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.exception.JDBCExceptionHelper;
/**
* Generates string values using the SQL Server NEWID() function.
*
* @author Joseph Fifield
*/
public class GUIDGenerator implements IdentifierGenerator {
private static final Logger log = LoggerFactory.getLogger(GUIDGenerator.class);
public Serializable generate(SessionImplementor session, Object obj)
throws HibernateException {
final String sql = session.getFactory().getDialect().getSelectGUIDString();
try {
PreparedStatement st = session.getBatcher().prepareSelectStatement(sql);
try {
ResultSet rs = st.executeQuery();
final String result;
try {
rs.next();
result = rs.getString(1);
}
finally {
rs.close();
}
log.debug("GUID identifier generated: " + result);
return result;
}
finally {
session.getBatcher().closeStatement(st);
}
}
catch (SQLException sqle) {
throw JDBCExceptionHelper.convert(
session.getFactory().getSQLExceptionConverter(),
sqle,
"could not retrieve GUID",
sql
);
}
}
}