/*
* 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.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.DataSource;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import org.jboss.as.cmp.jdbc.bridge.JDBCAbstractCMRFieldBridge;
import org.jboss.as.cmp.jdbc.bridge.JDBCAbstractEntityBridge;
import org.jboss.as.cmp.jdbc.metadata.JDBCEntityMetaData;
import org.jboss.as.cmp.jdbc.metadata.JDBCRelationMetaData;
import org.jboss.logging.Logger;
/**
* JDBCStopCommand drops the table for this entity if specified in the xml.
*
* @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:justin@j-m-f.demon.co.uk">Justin Forder</a>
* @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
* @version $Revision: 81030 $
*/
public final class JDBCStopCommand {
private final JDBCEntityPersistenceStore manager;
private final JDBCAbstractEntityBridge entity;
private final JDBCEntityMetaData entityMetaData;
private final Logger log;
public JDBCStopCommand(JDBCEntityPersistenceStore manager) {
this.manager = manager;
entity = manager.getEntityBridge();
entityMetaData = entity.getMetaData();
// Create the Log
log = Logger.getLogger(
this.getClass().getName() +
"." +
manager.getMetaData().getName());
}
public boolean execute() {
boolean success = true;
// drop relation tables
JDBCAbstractCMRFieldBridge[] cmrFields = entity.getCMRFields();
for (int i = 0; i < cmrFields.length; ++i) {
JDBCAbstractCMRFieldBridge cmrField = cmrFields[i];
JDBCRelationMetaData relationMetaData = cmrField.getMetaData().getRelationMetaData();
if (relationMetaData.isTableMappingStyle() && !relationMetaData.isTableDropped()) {
if (relationMetaData.getRemoveTable()) {
final boolean dropped = dropTable(manager.getDataSource(relationMetaData.getDataSourceName()), cmrField.getQualifiedTableName());
if (!dropped) {
success = false;
} else {
relationMetaData.setTableDropped();
}
}
}
}
if (entityMetaData.getRemoveTable()) {
boolean dropped = dropTable(entity.getDataSource(), entity.getQualifiedTableName());
if (!dropped) {
success = false;
}
}
return success;
}
private boolean dropTable(DataSource dataSource, String qualifiedTableName) {
boolean success;
Connection con = null;
ResultSet rs = null;
String schema = SQLUtil.getSchema(qualifiedTableName);
String tableName = schema != null ? SQLUtil.getTableNameWithoutSchema(qualifiedTableName) : qualifiedTableName;
// was the table already delete?
try {
con = dataSource.getConnection();
DatabaseMetaData dmd = con.getMetaData();
rs = dmd.getTables(con.getCatalog(), schema, tableName, null);
if (!rs.next()) {
return true;
}
} catch (SQLException e) {
log.debug("Error getting database metadata for DROP TABLE command. " +
" DROP TABLE will not be executed. ", e);
return true;
} finally {
JDBCUtil.safeClose(rs);
JDBCUtil.safeClose(con);
}
// since we use the pools, we have to do this within a transaction
// suspend the current transaction
TransactionManager tm = manager.getComponent().getTransactionManager();
Transaction oldTransaction = null;
try {
oldTransaction = tm.suspend();
} catch (Exception e) {
log.error("Could not suspend current transaction before drop table. " +
"'" + qualifiedTableName + "' will not be dropped.", e);
}
try {
Statement statement = null;
try {
con = dataSource.getConnection();
statement = con.createStatement();
// execute sql
String sql = SQLUtil.DROP_TABLE + qualifiedTableName;
log.debug("Executing SQL: " + sql);
statement.executeUpdate(sql);
success = true;
} finally {
JDBCUtil.safeClose(statement);
JDBCUtil.safeClose(con);
}
} catch (Exception e) {
log.debug("Could not drop table " + qualifiedTableName + ": " + e.getMessage());
success = false;
} finally {
try {
// resume the old transaction
if (oldTransaction != null) {
tm.resume(oldTransaction);
}
} catch (Exception e) {
log.error("Could not reattach original transaction after drop table");
}
}
return success;
}
}