今天写一个mysql存储过程，根据自己的需求要遍历一个数据表，因为对存储过程用的不多，语法不甚熟悉，加之存储过程没有调试环境，花了不少时间才慢慢弄好，故留个痕迹。
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