MySQL WHERE-condition in procedure ignored

问题

I am trying to make a procedure with arguments. But when I use them in a WHERE condition it is like there were never there. They are simply ignored.

DELIMITER //

DROP PROCEDURE IF EXISTS p //

CREATE PROCEDURE p (IN player TEXT, OUT num INT)
BEGIN
  SELECT COUNT(*) INTO num FROM `sg_playerstats` WHERE `player` = player; 
END

//

DELIMITER ;

Num gets filled correctly, but whatever I put in player, the result is ALWAYS 66. (The table has 66 rows!)

What am I doing wrong???

回答1:

rename your parameter,

CREATE PROCEDURE p (IN _player TEXT, OUT num INT)
BEGIN
  SELECT COUNT(*) INTO num FROM `sg_playerstats` WHERE `player` = _player; 
END

the reason why you are getting that is because it happens to have name collision.

来源：https://stackoverflow.com/questions/14515125/mysql-where-condition-in-procedure-ignored