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