/*
* 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.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.ejb.EJBException;
import org.jboss.deployment.DeploymentException;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCIdentityColumnCreateCommand;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCUtil;
import org.jboss.ejb.EntityEnterpriseContext;
/**
* Create method that uses the JDBC 3.0 getGeneratedKeys method to obtain
* the value from the identity column.
*
* @author <a href="mailto:jeremy@boynes.com">Jeremy Boynes</a>
* @version $Revision: 81030 $
*/
public class JDBC30GeneratedKeysCreateCommand extends JDBCIdentityColumnCreateCommand
{
private static final Method CONNECTION_PREPARE;
private static final Integer GENERATE_KEYS;
private static final Method GET_GENERATED_KEYS;
static {
Method prepare, getGeneratedKeys;
Integer generateKeys;
try {
prepare = Connection.class.getMethod("prepareStatement", new Class[] {String.class, int.class});
getGeneratedKeys = PreparedStatement.class.getMethod("getGeneratedKeys", null);
Field f = PreparedStatement.class.getField("RETURN_GENERATED_KEYS");
generateKeys = (Integer) f.get(PreparedStatement.class);
} catch (Exception e) {
prepare = null;
getGeneratedKeys = null;
generateKeys = null;
}
CONNECTION_PREPARE = prepare;
GET_GENERATED_KEYS = getGeneratedKeys;
GENERATE_KEYS = generateKeys;
}
public void init(JDBCStoreManager manager) throws DeploymentException
{
if (CONNECTION_PREPARE == null) {
throw new DeploymentException("Create command requires JDBC 3.0 (JDK1.4+)");
}
super.init(manager);
}
protected PreparedStatement prepareStatement(Connection c, String sql, EntityEnterpriseContext ctx) throws SQLException
{
try {
return (PreparedStatement) CONNECTION_PREPARE.invoke(c, new Object[] { sql, GENERATE_KEYS });
} catch (Exception e) {
throw processException(e);
}
}
protected int executeInsert(int paramIndex, PreparedStatement ps, EntityEnterpriseContext ctx) throws SQLException
{
int rows = ps.executeUpdate();
ResultSet rs = null;
try {
rs = (ResultSet) GET_GENERATED_KEYS.invoke(ps, null);
if (!rs.next()) {
// throw EJBException to force a rollback as the row has been inserted
throw new EJBException("getGeneratedKeys returned an empty ResultSet");
}
pkField.loadInstanceResults(rs, 1, ctx);
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
// throw EJBException to force a rollback as the row has been inserted
throw new EJBException("Error extracting generated keys", e);
} finally {
JDBCUtil.safeClose(rs);
}
return rows;
}
}