/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb.plugins.cmp.jdbc.keygen;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.ejb.CreateException;
import javax.sql.DataSource;
import org.jboss.deployment.DeploymentException;
import org.jboss.ejb.EntityEnterpriseContext;
import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMPFieldBridge;
import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCEntityCommandMetaData;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCInsertPKCreateCommand;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCUtil;
/**
* Create command that uses an SQL statement to generate the primary key.
* Typically used with databases that support sequences.
*
* @author <a href="mailto:loubyansky@hotmail.com">Alex Loubyansky</a>
*
* @version $Revision: 81030 $
*/
public class JDBCPkSqlCreateCommand extends JDBCInsertPKCreateCommand
{
protected String pkSQL;
protected JDBCCMPFieldBridge pkField;
public void init(JDBCStoreManager manager) throws DeploymentException
{
super.init(manager);
pkField = getGeneratedPKField();
}
protected void initEntityCommand(JDBCEntityCommandMetaData entityCommand) throws DeploymentException
{
super.initEntityCommand(entityCommand);
pkSQL = entityCommand.getAttribute("pk-sql");
if(pkSQL == null)
{
throw new DeploymentException("pk-sql attribute must be set for entity " + entity.getEntityName());
}
if(debug)
{
log.debug("Generate PK sql is: " + pkSQL);
}
}
protected void generateFields(EntityEnterpriseContext ctx) throws CreateException
{
super.generateFields(ctx);
Connection con = null;
Statement s = null;
ResultSet rs = null;
try
{
if(debug)
{
log.debug("Executing SQL: " + pkSQL);
}
DataSource dataSource = entity.getDataSource();
con = dataSource.getConnection();
s = con.createStatement();
rs = s.executeQuery(pkSQL);
if(!rs.next())
{
throw new CreateException("Error fetching next primary key value: result set contains no rows");
}
pkField.loadInstanceResults(rs, 1, ctx);
}
catch(SQLException e)
{
log.error("Error fetching the next primary key value", e);
throw new CreateException("Error fetching the next primary key value:" + e);
}
finally
{
JDBCUtil.safeClose(rs);
JDBCUtil.safeClose(s);
JDBCUtil.safeClose(con);
}
}
}