mysql 預存程序 範例程式碼

drop procedure if exists  P_SEQUENCE;/** 暫省略包  @AUTO LIANGRUI 2014/6/27  T_PRO_PRODUCT 表排序 對整個表進行按序號排序   根據序號從新自然排序 重複序號的安建立日期分配序號測試階段  測試調用set @merid='TEST66';call P_SEQUENCE(@merid);**/create procedure P_PRODUCT_SEQUENCE( in v_merchar_id VARCHAR(100)) begin  DECLARE v_id    VARCHAR(100);  DECLARE v_rowNo VARCHAR(100);  DECLARE flag int;  DECLARE e_error INTEGER DEFAULT 0;    -- 定義遊標 DECLARE c_cur CURSOR  for    Select a.id ,(@rowNum:=@rowNum+1) as rowNo    From T_PRO_PRODUCT a ,(Select (@rowNum :=0)) b      where MERCHANT_ID=v_merchar_id      order 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;    -- 迴圈所有的行   REPEAT      FETCH c_cur INTO v_id,v_rowNo;         update T_PRO_PRODUCT SET sequence= v_rowNo where ID=v_id;       -- 迴圈結束      UNTIL flag   END REPEAT;   -- 關閉遊標   CLOSE  c_cur;-- 交易處理IF e_error = 1 THENROLLBACK;ELSECOMMIT;END IF;end

上面的其實可以進行簡化

 SET @colNo = 0;
UPDATE T_PRO_PRODUCT SET SEQUENCE=(@colNo:=@colNo+1)  WHERE MERCHANT_ID='TEST66' ORDER BY SEQUENCE, CREATE_DT DESC;