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.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/dialogs/JdbcDriverManagerDialog.java
DriverInfo driverInfo = (DriverInfo) driverMap.get( getDriverClassName( source ) );
		return driverInfo.getDisplayName( );
	}
	
	/**
	 * 
	 * @param source
	 * @return
	 */
	private String getUrlTemplate( String source )
	{
		DriverInfo driverInfo = (DriverInfo) driverMap.get( getDriverClassName( source ) );
		return driverInfo.getUrlTemplate( );
	}	
	
	/**
	 * Carry out sort operation against certain jar column
	 * @param columnIndex the column based on which the sort operation would be carried out 
	 * @param asc the sort direction
	 */	
	private void sortJar( final int columnIndex, final boolean asc )
	{
		jarViewer.setComparator( new ViewerComparator( new Comparator( ) {
			/*
			 * @see java.util.Comparator#compare(java.lang.Object,
			 *      java.lang.Object)
			 */
			public int compare( Object o1, Object o2 )
			{
				String source = (String) o1;