Bug 191404 Connection is still successful after delete drivers[0703]
Description: Create a Sqlserver datasource and dataset, then delete the jtds driver. Click "Test Connection" is still successful, and the dataset still works. Build Version:2.2.0.v20070607-0630 Steps to reproduce: 1. Add a jtds driver, and create a Sqlserver connection and dataset. 2. Go to "Manage JDBC Drivers" dialog, and delete the driver. 3. Click "Test Connection", the connection is successful. 4. Click "Preview Results" in "Edit Data Set" dialog, it works. Expected Result: Delete driver will lose the connection.
data/org.eclipse.birt.report.data.oda.jdbc/src/org/eclipse/birt/report/data/oda/jdbc/JDBCDriverManager.java
private JDBCDriverManager()
	{
		logger.logp( java.util.logging.Level.FINE,
				OdaJdbcDriver.class.getName( ),
				"JDBCDriverManager",
				"JDBCDriverManager starts up" );
	}
	
	public synchronized static JDBCDriverManager getInstance()
	{
		if ( instance == null )
			instance = new JDBCDriverManager();
		return instance;
	}
	
	/**
	 * Gets a JDBC connection 
	 * @param driverClass Class name of JDBC driver
	 * @param url Connection URL
	 * @param connectionProperties Properties for establising connection
	 * @return new JDBC Connection
	 * @throws SQLException
	 */
	public Connection getConnection( String driverClass, String url, 
			Properties connectionProperties ) throws SQLException, OdaException
	{
        validateConnectionUrl( url );
		if ( logger.isLoggable( Level.FINE ))
			logger.fine("Request JDBC Connection: driverClass=" + 
					(driverClass == null? "" : driverClass) + "; url=" + url);