如何限制MySQL中的执行时间？

Question

I have following code to limit execution time in MySQL but it is not working. Someone help me out.

delimiter //
   CREATE PROCEDURE `classicWatches`.kill_long_running_queries()

BEGIN
  DECLARE process_id BIGINT;
  DECLARE finished INT DEFAULT 0;
  DECLARE kill_process_id CURSOR FOR SELECT ID FROM INFORMATION_SCHEMA.PROCESSLIST WHERE COMMAND = 'Query' AND TIME > 5; # only for 5 seconds just testing whether it works or not
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;
  OPEN kill_process_query;

  loop_loop: LOOP

FETCH kill_process_id INTO process_id;   

IF process_id >=1 THEN 
    KILL QUERY process_id ; # Here showing error in mysql workbench but don't know what error
END IF ;
IF finished THEN

  LEAVE loop_loop;
END IF;
  END LOOP loop_loop;
     CLOSE kill_process_id;

END //
delimiter ;

CREATE EVENT kill_long_running_queries
ON SCHEDULE EVERY 10 SECOND
DO CALL `classicWatches`.kill_long_running_queries();

Answer 1

I'm not quite sure what you want to accomplish.

The error shown in Workbench is because an integer is expected (as shown on line 23 - line 23 is just an example), but it is found process_id variable, however, the stored procedure is created and executed correctly when invoked.

The cursor is kill_process_id , but on line 13 you open the cursor kill_process_query does not exist, you need to change for line 14.