mysql 存储过程 示例代码_MySQL

drop procedure if existsP_SEQUENCE;/** 暂省略包@AUTO LIANGRUI 2014/6/27T_PRO_PRODUCT 表	排序 对整个表进行按序号排序 根据序号从新自然排序 重复序号的安创建日期分配序号	测试阶段测试调用	set @merid='TEST66';	call P_SEQUENCE(@merid);	**/create procedure P_PRODUCT_SEQUENCE( in v_merchar_id VARCHAR(100)) beginDECLARE v_idVARCHAR(100);DECLARE v_rowNo VARCHAR(100);DECLARE flag int;DECLARE e_error INTEGER DEFAULT 0;-- 定义游标 DECLARE c_cur CURSORforSelect a.id ,(@rowNum:=@rowNum+1) as rowNoFrom T_PRO_PRODUCT a ,(Select (@rowNum :=0)) bwhere MERCHANT_ID=v_merchar_idorder by ISNULL(a.sequence),a.sequence,a.create_dt; DECLARE CONTINUE HANDLER FOR NOT FOUND SET flag=1;DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET e_error=1;SET flag=0;OPEN c_cur;-- 循环所有的行 REPEATFETCH c_cur INTO v_id,v_rowNo; update T_PRO_PRODUCT SET sequence= v_rowNo where ID=v_id; -- 循环结束UNTIL flag END REPEAT; -- 关闭游标 CLOSEc_cur;	-- 事务处理	IF e_error = 1 THEN			ROLLBACK;	ELSE			COMMIT;	END IF;end

上面的其实可以进行简化

SET @colNo = 0;

UPDATE T_PRO_PRODUCT SET SEQUENCE=(@colNo:=@colNo+1)  WHERE MERCHANT_ID='TEST66' ORDER BY SEQUENCE, CREATE_DT DESC;