/*
* 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.util.Iterator;
import javax.ejb.EJBException;
import javax.sql.DataSource;
import org.jboss.as.cmp.CmpMessages;
import org.jboss.as.cmp.jdbc.bridge.JDBCCMPFieldBridge;
import org.jboss.as.cmp.jdbc.bridge.JDBCCMRFieldBridge;
import org.jboss.logging.Logger;
/**
* Inserts relations into a relation table.
*
* @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
* @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
* @version $Revision: 81030 $
*/
public final class JDBCInsertRelationsCommand {
private final Logger log;
public JDBCInsertRelationsCommand(JDBCStoreManager manager) {
this.log = Logger.getLogger(
this.getClass().getName() +
"." +
manager.getMetaData().getName());
}
public void execute(RelationData relationData) {
if (relationData.addedRelations.size() == 0) {
return;
}
Connection con = null;
PreparedStatement ps = null;
JDBCCMRFieldBridge cmrField = relationData.getLeftCMRField();
try {
// get the sql
String sql = getSQL(relationData);
boolean debug = log.isDebugEnabled();
if (debug)
log.debug("Executing SQL: " + sql);
// get the connection
DataSource dataSource = cmrField.getDataSource();
con = dataSource.getConnection();
// get a prepared statement
ps = con.prepareStatement(sql);
Iterator pairs = relationData.addedRelations.iterator();
while (pairs.hasNext()) {
RelationPair pair = (RelationPair) pairs.next();
// set the parameters
setParameters(ps, relationData, pair);
int rowsAffected = ps.executeUpdate();
}
} catch (Exception e) {
throw CmpMessages.MESSAGES.couldNotInsertRelations(cmrField.getQualifiedTableName(), e);
} finally {
JDBCUtil.safeClose(ps);
JDBCUtil.safeClose(con);
}
}
protected static String getSQL(RelationData relationData) {
JDBCCMRFieldBridge left = relationData.getLeftCMRField();
JDBCCMRFieldBridge right = relationData.getRightCMRField();
StringBuffer sql = new StringBuffer(200);
sql.append(SQLUtil.INSERT_INTO).append(left.getQualifiedTableName());
sql.append('(');
SQLUtil.getColumnNamesClause(left.getTableKeyFields(), sql);
sql.append(SQLUtil.COMMA);
SQLUtil.getColumnNamesClause(right.getTableKeyFields(), sql);
sql.append(')');
sql.append(SQLUtil.VALUES).append('(');
SQLUtil.getValuesClause(left.getTableKeyFields(), sql);
sql.append(SQLUtil.COMMA);
SQLUtil.getValuesClause(right.getTableKeyFields(), sql);
sql.append(')');
return sql.toString();
}
protected static void setParameters(PreparedStatement ps,
RelationData relationData,
RelationPair pair) {
int index = 1;
// left keys
Object leftId = pair.getLeftId();
JDBCCMPFieldBridge[] leftFields = (JDBCCMPFieldBridge[]) relationData.getLeftCMRField().getTableKeyFields();
for (int i = 0; i < leftFields.length; ++i)
index = leftFields[i].setPrimaryKeyParameters(ps, index, leftId);
// right keys
Object rightId = pair.getRightId();
JDBCCMPFieldBridge[] rightFields = (JDBCCMPFieldBridge[]) relationData.getRightCMRField().getTableKeyFields();
for (int i = 0; i < rightFields.length; ++i)
index = rightFields[i].setPrimaryKeyParameters(ps, index, rightId);
}
}