/**
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* that the following conditions are met:
*
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* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
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* products derived from this Software without prior written
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* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Exoffice Technologies. Exolab is a registered
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*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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*
* Copyright 2002-2003 (C) Exoffice Technologies Inc. All Rights Reserved.
*
* $Id: V061toV072SchemaConverter.java,v 1.1 2004/11/26 01:51:16 tanderson Exp $
*/
package org.exolab.jms.tools.db.migration;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.ValidationException;
import org.exolab.jms.persistence.PersistenceException;
import org.exolab.jms.persistence.SQLHelper;
import org.exolab.jms.tools.db.Attribute;
import org.exolab.jms.tools.db.Database;
import org.exolab.jms.tools.db.InvalidTypeException;
import org.exolab.jms.tools.db.RDBMSTool;
import org.exolab.jms.tools.db.SchemaBrowser;
import org.exolab.jms.tools.db.SchemaConverter;
import org.exolab.jms.tools.db.SchemaHelper;
import org.exolab.jms.tools.db.Table;
import org.exolab.jms.tools.db.Type;
/**
* A schema converter for converting from the 0.6.1 schema to the 0.7.2 schema
*
* @version $Revision: 1.1 $ $Date: 2004/11/26 01:51:16 $
* @author <a href="mailto:tima@intalio.com">Tim Anderson</a>
*/
public class V061toV072SchemaConverter implements SchemaConverter {
/**
* The database connection
*/
private Connection _connection;
/**
* The RDBMS tool
*/
private RDBMSTool _tool;
/**
* The name of the destinations table
*/
private static final String DESTINATIONS_TABLE = "destinations";
/**
* The name of the isQueue column
*/
private static final String ISQUEUE_COLUMN = "isQueue";
/**
* The logger
*/
private static final Log _log =
LogFactory.getLog(V061toV072SchemaConverter.class);
/**
* Construct a new <code>V061toV072SchemaConverter</code>
*
* @param connection the connection to use
*/
public V061toV072SchemaConverter(Connection connection) {
_connection = connection;
}
public void convert() throws PersistenceException {
Database schema = SchemaHelper.getSchema();
try {
if (_connection.getAutoCommit()) {
_connection.setAutoCommit(false);
}
_tool = new RDBMSTool(_connection);
} catch (SQLException exception) {
throw new PersistenceException(exception.getMessage());
}
try {
if (needsConversion(schema)) {
doConvert(schema);
}
SchemaHelper.setVersion(_connection, "V0.7.2");
_connection.commit();
} catch (SQLException exception) {
SQLHelper.rollback(_connection);
throw new PersistenceException(exception);
}
}
private boolean needsConversion(Database schema)
throws PersistenceException {
boolean result = false;
SchemaBrowser browser = _tool.getSchemaBrowser();
// get the expected type of the isQueue column
Table table = SchemaHelper.getTable(schema, DESTINATIONS_TABLE);
Attribute column = SchemaHelper.getAttribute(table, ISQUEUE_COLUMN);
Type expected = browser.getType(column);
// get the actual type of the isQueue column
try {
Table currentTable = browser.getTable(DESTINATIONS_TABLE);
Attribute currentColumn =
SchemaHelper.getAttribute(currentTable, ISQUEUE_COLUMN);
Type currentType = browser.getType(currentColumn);
result = (currentType.getType() != expected.getType());
} catch (InvalidTypeException exception) {
// this will only occur if the JDBC driver is buggy (its amazing
// home many are - MM.MySQL 2.0.x and Oracle are 2 examples)
// Try and perform a conversion anyway - and hope for the best...
_log.warn(exception);
result = true;
}
return result;
}
private void doConvert(Database schema) throws PersistenceException {
Table table = SchemaHelper.getTable(schema, DESTINATIONS_TABLE);
// create a temporary table to perform conversion
Table tmpTable = new Table();
String tmpName = "openjms_tmp_" + DESTINATIONS_TABLE;
tmpTable.setName(tmpName);
tmpTable.setAttribute(table.getAttribute());
_tool.drop(tmpTable);
_tool.create(tmpTable);
// convert the destinations table, inserting converted records into
// the temporary table
PreparedStatement select = null;
ResultSet set = null;
try {
select = _connection.prepareStatement(
"select * from " + DESTINATIONS_TABLE);
set = select.executeQuery();
while (set.next()) {
String name = set.getString(1);
boolean isQueue = (set.getInt(2) > 0);
long id = set.getLong(3);
insert(tmpName, name, isQueue, id);
}
} catch (SQLException exception) {
throw new PersistenceException("Failed to convert destinations",
exception);
} finally {
SQLHelper.close(set);
SQLHelper.close(select);
}
// recreate the destinations table
_tool.drop(table);
_tool.create(table);
// copy the data from the temporary table into the destinations table
PreparedStatement insert = null;
try {
insert = _connection.prepareStatement(
"insert into " + DESTINATIONS_TABLE + " select * from " +
tmpName);
insert.executeQuery();
} catch (SQLException exception) {
throw new PersistenceException(
"Failed to copy converted destinations", exception);
} finally {
SQLHelper.close(insert);
}
// drop the temporary table
_tool.drop(tmpTable);
}
private void insert(String table, String name, boolean isQueue, long id)
throws SQLException {
PreparedStatement insert = _connection.prepareStatement(
"insert into " + table + " values (?, ?, ?)");
insert.setString(1, name);
insert.setBoolean(2, isQueue);
insert.setLong(3, id);
insert.executeUpdate();
}
} //-- V061toV072SchemaConverter