/*
* 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 javax.ejb.EJBException;
import org.jboss.as.cmp.CmpMessages;
import org.jboss.as.cmp.context.CmpEntityBeanContext;
import org.jboss.as.cmp.jdbc.bridge.JDBCCMPFieldBridge;
import org.jboss.as.cmp.jdbc.bridge.JDBCEntityBridge;
import org.jboss.as.cmp.jdbc.bridge.JDBCFieldBridge;
import org.jboss.logging.Logger;
/**
* JDBCStoreEntityCommand updates the row with the new state.
* In the event that no field is dirty the command just returns.
* Note: read-only fields are never considered dirty.
*
* @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
* @author <a href="mailto:rickard.oberg@telkel.com">Rickard Oberg</a>
* @author <a href="mailto:marc.fleury@telkel.com">Marc Fleury</a>
* @author <a href="mailto:shevlandj@kpi.com.au">Joe Shevland</a>
* @author <a href="mailto:justin@j-m-f.demon.co.uk">Justin Forder</a>
* @author <a href="mailto:sebastien.alborini@m4x.org">Sebastien Alborini</a>
* @author <a href="mailto:alex@jboss.org">Alex Loubyansky</a>
* @version $Revision: 81030 $
*/
public final class JDBCStoreEntityCommand {
private final JDBCEntityBridge entity;
private final JDBCFieldBridge[] primaryKeyFields;
private final Logger log;
public JDBCStoreEntityCommand(JDBCStoreManager manager) {
entity = (JDBCEntityBridge) manager.getEntityBridge();
primaryKeyFields = entity.getPrimaryKeyFields();
// Create the Log
log = Logger.getLogger(
this.getClass().getName() +
"." +
manager.getMetaData().getName());
}
public void execute(CmpEntityBeanContext ctx) {
// scheduled for batch cascade-delete instance should not be updated
// because foreign key fields could be updated to null and cascade-delete will fail.
JDBCEntityBridge.FieldIterator dirtyIterator = entity.getDirtyIterator(ctx);
if (!dirtyIterator.hasNext() || entity.isBeingRemoved(ctx) || entity.isScheduledForBatchCascadeDelete(ctx)) {
if (log.isTraceEnabled()) {
log.trace("Store command NOT executed. Entity is not dirty "
+ ", is being removed or scheduled for *batch* cascade delete: pk=" + ctx.getPrimaryKey());
}
return;
}
// generate sql
StringBuffer sql = new StringBuffer(200);
sql.append(SQLUtil.UPDATE)
.append(entity.getQualifiedTableName())
.append(SQLUtil.SET);
SQLUtil.getSetClause(dirtyIterator, sql)
.append(SQLUtil.WHERE);
SQLUtil.getWhereClause(primaryKeyFields, sql);
boolean hasLockedFields = entity.hasLockedFields(ctx);
JDBCEntityBridge.FieldIterator lockedIterator = null;
if (hasLockedFields) {
lockedIterator = entity.getLockedIterator(ctx);
while (lockedIterator.hasNext()) {
sql.append(SQLUtil.AND);
JDBCCMPFieldBridge field = lockedIterator.next();
if (field.getLockedValue(ctx) == null) {
SQLUtil.getIsNullClause(false, field, "", sql);
lockedIterator.remove();
} else {
SQLUtil.getWhereClause(field, sql);
}
}
}
Connection con = null;
PreparedStatement ps = null;
int rowsAffected = 0;
try {
// create the statement
if (log.isDebugEnabled()) {
log.debug("Executing SQL: " + sql);
}
// get the connection
con = entity.getDataSource().getConnection();
ps = con.prepareStatement(sql.toString());
// SET: set the dirty fields parameters
int index = 1;
dirtyIterator.reset();
while (dirtyIterator.hasNext()) {
index = dirtyIterator.next().setInstanceParameters(ps, index, ctx);
}
// WHERE: set primary key fields
index = entity.setPrimaryKeyParameters(ps, index, ctx.getPrimaryKey());
// WHERE: set optimistically locked field values
if (hasLockedFields) {
lockedIterator.reset();
while (lockedIterator.hasNext()) {
JDBCCMPFieldBridge field = lockedIterator.next();
Object value = field.getLockedValue(ctx);
index = field.setArgumentParameters(ps, index, value);
}
}
// execute statement
rowsAffected = ps.executeUpdate();
} catch (EJBException e) {
throw e;
} catch (Exception e) {
throw CmpMessages.MESSAGES.storeFailed(e);
} finally {
JDBCUtil.safeClose(ps);
JDBCUtil.safeClose(con);
}
// check results
if (rowsAffected != 1) {
throw CmpMessages.MESSAGES.updateFailedTooManyRowsAffected(rowsAffected, ctx.getPrimaryKey());
}
// Mark the updated fields as clean.
dirtyIterator.reset();
while (dirtyIterator.hasNext()) {
dirtyIterator.next().setClean(ctx);
}
}
}