/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., 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.as.cmp.jdbc;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.ejb.CreateException;
import javax.ejb.DuplicateKeyException;
import org.jboss.as.cmp.context.CmpEntityBeanContext;
/**
* Base class for create commands that actually insert the primary key value.
* If an exception processor is not supplied, this command will perform an
* additional query to determine if a DuplicateKeyException should be thrown.
*
* @author <a href="mailto:jeremy@boynes.com">Jeremy Boynes</a>
*/
public abstract class JDBCInsertPKCreateCommand extends JDBCAbstractCreateCommand {
protected String existsSQL;
public void init(JDBCStoreManager manager) {
super.init(manager);
// if no exception processor is defined, we will perform a existance
// check before trying the insert to report duplicate key
if (exceptionProcessor == null) {
initExistsSQL();
}
}
protected void initExistsSQL() {
StringBuffer sql = new StringBuffer(300);
sql.append(SQLUtil.SELECT).append("COUNT(*)").append(SQLUtil.FROM)
.append(entity.getQualifiedTableName())
.append(SQLUtil.WHERE);
SQLUtil.getWhereClause(entity.getPrimaryKeyFields(), sql);
existsSQL = sql.toString();
if (debug) {
log.debug("Entity Exists SQL: " + existsSQL);
}
}
protected void beforeInsert(CmpEntityBeanContext ctx) throws CreateException {
// are we checking existance by query?
if (existsSQL != null) {
Connection c = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
if (debug)
log.debug("Executing SQL: " + existsSQL);
c = entity.getDataSource().getConnection();
ps = c.prepareStatement(existsSQL);
// bind PK
// @todo add a method to EntityBridge that binds pk fields directly
Object pk = entity.extractPrimaryKeyFromInstance(ctx);
entity.setPrimaryKeyParameters(ps, 1, pk);
rs = ps.executeQuery();
if (!rs.next()) {
throw new CreateException("Error checking if entity with primary pk " + pk + "exists: SQL returned no rows");
}
if (rs.getInt(1) > 0) {
throw new DuplicateKeyException("Entity with primary key " + pk + " already exists");
}
} catch (SQLException e) {
log.error("Error checking if entity exists", e);
throw new CreateException("Error checking if entity exists:" + e);
} finally {
JDBCUtil.safeClose(rs);
JDBCUtil.safeClose(ps);
JDBCUtil.safeClose(c);
}
}
}
}