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
final Table table = new Table( page, SWT.BORDER | SWT.FULL_SELECTION );
		GridData data = new GridData( GridData.FILL_BOTH );
		table.setLayoutData( data );
		table.setHeaderVisible( true );
		table.setLinesVisible( true );
		TableLayout tableLayout = new TableLayout( );
		table.setLayout( tableLayout );
		final TableColumn column0 = new TableColumn( table, SWT.NONE );
		column0.setWidth( 20 );
		final TableColumn column1 = new TableColumn( table, SWT.NONE );
		column1.setText( JdbcPlugin.getResourceString( "driverManagerDialog.text.jarColumnFileName" ) ); 
		column1.setWidth( 150 );
		column1.addSelectionListener( new SelectionListener( ) {
			private boolean asc = false;
			
			public void widgetSelected( SelectionEvent e )
			{
				sortJar( 1, asc );
				asc = !asc;
			}
			public void widgetDefaultSelected( SelectionEvent e )
			{
				widgetSelected( e );
			}
		} );
		final TableColumn column2 = new TableColumn( table, SWT.NONE );
		column2.setText( JdbcPlugin.getResourceString( "driverManagerDialog.text.jarColumnLocation" ) ); 
		column2.setWidth( 280 );
		column2.addSelectionListener( new SelectionListener( ) {
			private boolean asc = false;