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/provider/JdbcMetaDataProvider.java
catch ( SQLException e )
				{
					columnsRs = reTryAchieveResultSet( "PROCEDURE_COLUMNS", new Object[]{cataLog,
							schemaPattern,
							procedureNamePattern,
							columnNamePattern });
				}
				int n = 0;
				while ( columnsRs.next( ) )
				{
					ProcedureParameter column = new ProcedureParameter( );
					column.setSchema( schemaPattern );
					
					 
					column.setProcedureName( columnsRs.getString( "PROCEDURE_NAME" ) );
					String columnName = columnsRs.getString( "COLUMN_NAME" );
					if ( columnName != null )
						column.setName( columnName );
					else
					{
						
						n++;
						column.setName( "param" + n );
					}
					column.setModeType( columnsRs.getInt( "COLUMN_TYPE" ) );
					column.setDataType( columnsRs.getInt( "DATA_TYPE" ) );
					column.setDataTypeName( columnsRs.getString( "TYPE_NAME" ) );
					
					
					columnList.add( column );