Bug 199021 Error message pops up several times when click an invalid dataset
Description: There is a sqlserver datasource and dataset, remove the jtds driver to let the dataset invalid. Double click on the dataset, the error message will pop up serveral times. Build version:2.2.0.v20070807-0630 Steps to reproduce: 1. Create a sqlserver datasource and dataset. 2. Remove the jtds driver, and the dataset will be invalid. 3. Double click on the dataset. Expect result: Error message pops up once to indicate the problem. Actual result: Error message pops up serveral times.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
for ( int i = 0; i < rsc.getResultColumnDefinitions( ).size( ); i++ )
				{
					ColumnDefinition cd = (ColumnDefinition) rsc.getResultColumnDefinitions( ).get( i );
					if ( !( cd.getAttributes( )
							.getName( )
							.equals( meta.getColumnName( i + 1 ) ) && cd.getAttributes( )
							.getNativeDataTypeCode( ) == meta.getColumnType( i + 1 ) ) )
					{
						this.shouldUpdateDataSetDesign = true;
						return;
					}
				}
			}
			catch ( SQLException e )
			{
				
				logger.log( Level.FINE, e.getMessage( ), e );
			}
			
		}
	}
	/**
	 * 
	 */
	private void addFetchDbObjectListener( )
	{
		availableDbObjectsTree.addListener( SWT.Expand, new Listener( ) {
			/*
			 * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
			 */