存储过程修改产品描述页图片alt描述信息

今天修改了所有产品的图片信息，用到了存储过程。在参考下面存储过程以后，终于搞定了。

 1 BEGIN

 2      DECLARE Done INT DEFAULT 0;

 3     

 4      DECLARE CurrentLingQi INT;

 5     

 6      DECLARE ShizuName VARCHAR(30);

 7      /* 声明游标 */

 8      DECLARE rs CURSOR FOR SELECT NodeName, LingQi FROM socialrelation;

 9      /* 异常处理 */

10      DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;

11     

12      /* 打开游标 */

13      OPEN rs;  

14     

15      /* 逐个取出当前记录LingQi字段的值，需要进行最大值的判断 */

16      FETCH NEXT FROM rs INTO ShizuName, CurrentLingQi;     

17      /* 遍历数据表 */

18      REPEAT

19            IF NOT Done THEN

20               SET CurrentLingQi = CurrentLingQi + 60;

21               /* 如果更新后灵气值大于允许的最大值，则就设置为最大值 */

22               IF CurrentLingQi >= 1800 THEN

23                  UPDATE socialrelation SET LingQi = 1800 WHERE NodeName = ShizuName;

24               ELSE

25               /* 否则，正常更新 */

26                  UPDATE socialrelation SET LingQi = LingQi + 60 WHERE NodeName = ShizuName;

27               END IF;

28            END IF;

29           

30      FETCH NEXT FROM rs INTO ShizuName, CurrentLingQi;

31 

32      UNTIL Done END REPEAT;

33     

34      /* 关闭游标 */

35      CLOSE rs;

36 END

　　把写的存储过程也记录下来，作为以后参考。在感谢罗浮宫的童鞋们。感谢伊罗生。

begin

DECLARE Done INT DEFAULT 0;

declare pid int(11);

declare miaoshu text;

declare topnamePosition int(11);

declare startTopname int(11);

declare revPos int(11);

declare miaoshuLength int(11);

declare endTopname int(11);

declare pname VARCHAR(255);

declare topnameLength text;

declare topnameTag text;

declare reverseMiaoshu text;

declare rs cursor for select productid,productname,chanpinmiaoshu from product;

declare CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;

open rs;

fetch next from rs into pid,pname,miaoshu;

repeat

		if not done then

			  set miaoshuLength=CHARACTER_LENGTH(miaoshu);

			  set topnamePosition=position("13733681492079.jpg" in miaoshu);

			  set endTopname=locate(">",miaoshu,topnamePosition);

			  set reverseMiaoshu=reverse(miaoshu);

				set revPos=miaoshuLength-topnamePosition;

			  set startTopname=locate("gmi<",reverseMiaoshu,revPos);

			  set startTopname=miaoshuLength-startTopname;

				set topnameLength=endTopname-startTopname;

			  set topnameTag=substring(miaoshu,startTopname-2,topnameLength+3);

				select pid,topnameTag;

			  update product set `chanpinmiaoshu`=replace(`chanpinmiaoshu`,trim(topnameTag),'<img src="/ueditor/php/upload/20130709/13733681492079.jpg" width="740" height="651" border="0" hspace="0" vspace="0" style="width:740px;height:651px;" alt="熊猫银币投资">') where productid=pid;

		 end if;

		 fetch next from rs into pid,pname,miaoshu;

until done end repeat;

close rs;

end