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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Michael Powers
This library 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 library 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 library; if not, see http://www.gnu.org
*/
package net.wotonomy.jdbcadaptor;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import net.wotonomy.access.EOAdaptor;
import net.wotonomy.access.EOAdaptorChannel;
import net.wotonomy.access.EOAdaptorContext;
/**
* Concrete implementation of EOAdaptorContext for use with JDBC.
*
* @author ezamudio@nasoft.com
* @author $Author: cgruber $
* @version $Revision: 903 $
*/
public class JDBCContext extends EOAdaptorContext {
protected Connection _jdbcConnection;
/**
* Creates a new instance.
*
* @param adaptor The adaptor this context belongs to.
*/
public JDBCContext(EOAdaptor adaptor) {
super(adaptor);
}
public void connect() throws JDBCAdaptorException {
try {
if (_jdbcConnection != null && !_jdbcConnection.isClosed())
throw new JDBCAdaptorException("Attempt to connect when already connected.", null);
Class.forName(((JDBCAdaptor) adaptor()).driverName());
String url = (String) adaptor().connectionDictionary().objectForKey("URL");
Driver driver = DriverManager.getDriver(url);
java.util.Properties props = new java.util.Properties();
props.setProperty("user", (String) adaptor().connectionDictionary().objectForKey("username"));
props.setProperty("password", (String) adaptor().connectionDictionary().objectForKey("password"));
_jdbcConnection = driver.connect(url, props);
_jdbcConnection.setAutoCommit(false);
} catch (SQLException ex) {
throw new JDBCAdaptorException("Cannot connect to database", ex);
} catch (ClassNotFoundException ex) {
throw new JDBCAdaptorException("Cannot find JDBC driver " + ex.getMessage(), null);
}
}
public void disconnect() throws JDBCAdaptorException {
if (_jdbcConnection != null) {
try {
_jdbcConnection.close();
_jdbcConnection = null;
transactionDidRollback();
} catch (SQLException ex) {
throw new JDBCAdaptorException("Trying to close connection.", ex);
}
}
}
public Connection connection() {
return _jdbcConnection;
}
/*
* Begins a transaction. Actually it does nothing because it's not necessary.
*
* @see net.wotonomy.access.EOAdaptorContext#beginTransaction()
*/
public void beginTransaction() {
if (hasOpenTransaction())
throw new JDBCAdaptorException("Cannot nest transactions.", null);
transactionDidBegin();
}
/*
* Commits a transaction.
*
* @see net.wotonomy.access.EOAdaptorContext#commitTransaction()
*/
public void commitTransaction() {
try {
_jdbcConnection.commit();
transactionDidCommit();
} catch (SQLException ex) {
throw new JDBCAdaptorException("Cannot commit.", ex);
}
}
/*
* Rolls back a transacion.
*
* @see net.wotonomy.access.EOAdaptorContext#rollbackTransaction()
*/
public void rollbackTransaction() {
try {
_jdbcConnection.rollback();
transactionDidRollback();
} catch (SQLException ex) {
throw new JDBCAdaptorException("Cannot commit.", ex);
}
}
/*
* Creates a JDBCChannel instance.
*
* @see net.wotonomy.access.EOAdaptorContext#createAdaptorChannel()
*/
public EOAdaptorChannel createAdaptorChannel() {
JDBCChannel channel = new JDBCChannel(this);
_channels.addObject(channel);
return channel;
}
/*
* I don't know what to do here. Throw something, maybe?
*
* @see net.wotonomy.access.EOAdaptorContext#handleDroppedConnection()
*/
public void handleDroppedConnection() {
// TODO Auto-generated method stub
}
}
/*
* $Log$ Revision 1.2 2006/02/18 22:59:22 cgruber make it compile with maven
* dependencies and add a cvsignore.
*
* Revision 1.1 2006/02/16 13:22:23 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.1 2003/08/13 20:13:33 chochos concrete implementation of
* EOAdaptorContext for use with JDBC. This is the class that holds the physical
* connection to the database.
*
*/
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