mysql 写过的存储过程(PROCEDURE)

Mysql  /  houtizong 发布于 3年前   130

因为在自定义函数中limit后面不支持写变量，也不支持动态sql，所以只能写一个存储过程。

getID：

delimiter $$DROP PROCEDURE IF EXISTS `getID`$$CREATE PROCEDURE getID(IN appID INT, IN tID INT, IN floor INT)BEGINDECLARE s VARCHAR(255);DECLARE f INT;SET f = floor - 1;SET @mID = 0;SET @ms=concat('SELECT `id` INTO @mID FROM `comment`  WHERE `appid`= ',appID,' AND `tid`= ',tID,' ORDER BY `id` LIMIT ',f,',1');PREPARE STMT FROM @ms;EXECUTE STMT;END$$delimiter ;

第二种写法：

delimiter $$DROP PROCEDURE IF EXISTS `getID`$$CREATE PROCEDURE getID(IN appID INT, IN tID INT, IN floor INT)BEGINDECLARE f INT;SET f = floor - 1;SET @appID = appID;SET @tID = tID;SET @f = f;SET @mID = 0;SET @ms = 'SELECT `id` INTO @mID FROM `wy_comment`  WHERE `appid`=? AND `tid`=? ORDER BY `id` LIMIT ?,1';PREPARE STMT FROM @ms;EXECUTE STMT USING @appID,@tID,@f;END$$delimiter ;

测试sql：

CALL getID(25,3399,2);SELECT @mID;