code: def listRuns(self, run_num=-1, logical_file_name="",
                   block_name="", dataset=""):
          
          if( '%' in logical_file_name or '%' in block_name or '%' in dataset ):
              dbsExceptionHandler('dbsException-invalid-input', 
                                  " DBSDatasetRun/listRuns. No wildcards are allowed in logical_file_name, block_name or dataset.\n.")
          conn = self.dbi.connection()
          tran = False
          try:
              ret = self.runlist.execute(conn, run_num, logical_file_name, block_name, dataset, tran)
              result = []
              rnum = []
              for i in ret:
                  rnum.append(i['run_num'])
              result.append({'run_num' : rnum})
              return result
  
          finally:
              if conn:
                  conn.close()
docs: List run known to DBS.