记一次mysql存储过程的使用

 1 CREATE DEFINER=`root`@`localhost` PROCEDURE `countcate`()
 2 BEGIN
 3     -- 定义需要接收游标数据的变量
 4     DECLARE cateid INT(10);
 5     -- 定义结束标志
 6     DECLARE done INT(1) DEFAULT 0;
 7     -- 定义游标
 8     DECLARE cur CURSOR FOR SELECT society_cate.id from society_cate;
 9     -- 将结束标志绑定到游标
10     DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
11     -- 开启游标
12     OPEN cur;
13         -- 开始循环
14     loop_label: LOOP
15          -- 提取游标的数据
16          FETCH cur INTO cateid;
17          -- if判断何时结束循环
18      IF done = 1 THEN
19            LEAVE loop_label; 
20        END IF; 
21          
22          -- 操作sql语句
23          UPDATE society_cate sc SET sc.count = (SELECT count(1) from society WHERE society.society_cate = cateid) WHERE sc.id = cateid;
24          
25         END LOOP loop_label;
26 
27 END