Bug 153387 Database item can't be dragged and dropped onto editor field
Steps to reproduce: 1.Start up BIRT in Mac OS X; 2.File->New->Project; 3.File->New->Report Design; 4.In Data Explorer, create a New Data Source, and choose "Classic Models Inc. Sample DataBase", press "Next" and then press "finish"; 5.In Data Explorer, create a New Data Set, press "Next"; 6.In the popup window, expand the "CLASSICMODELS", select and drag a item onto the editor field at right side.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
int index = -1;
					if ( ( index = tableName.lastIndexOf( schemaSeparator ) ) != -1 )
					{
						schemaName = tableName.substring( 0, index );
						tableName = tableName.substring( index + 1 );
					}
				}
				if ( item.getData( ) instanceof DbObject )
				{
					DbObject obj = (DbObject) item.getData( );
					if ( obj.getType( ) == DbObject.TABLE_TYPE
							|| obj.getType( ) == DbObject.VIEW_TYPE )
					{
						ArrayList columnList = metaDataProvider.getColumns( catalogName,
								schemaName,
								tableName,
								null );
						TreeItem[] items = item.getItems( );
						if ( items != null )
						{
							for ( int i = 0; i < items.length; i++ )
							{
								items[i].dispose( );
							}
						}
						Utility.createTreeItems( item,
								columnList,
								SWT.NONE,
								columnImage );