return ( (TableInfo) this.tableInfos.get( tableName ) ).getBackRefNumber( columnName );
Object tableInfo = this.tableInfos.get( tableName == null ? "":tableName.trim( ) ); if( tableInfo!= null ) return ( (TableInfo)tableInfo ).getBackRefNumber( columnName == null? "":columnName.trim( ) ); else return -1;
	public int getTableNestedColumnBackRefNumber( String tableName, String columnName )	{		return ( (TableInfo) this.tableInfos.get( tableName ) ).getBackRefNumber( columnName );	}