mysql 循环、游标

mysql 循环只能在存储过程。代码记录

 CREATE DEFINER=`front`@`%` PROCEDURE `a_1`()
 BEGIN

   -- 声明变量，接收游标循环变量
   DECLARE _comid INT;
     -- 遍历数据结束标志
   DECLARE done INT DEFAULT 1;

   -- 游标
   DECLARE cur CURSOR FOR select CompanyId From tbcompany ;
   -- 游标循环结束设置结束标志为null
   declare CONTINUE HANDLER FOR SQLSTATE '' SET done = null;
   set done = 1;
   -- 打开游标
   OPEN cur;
   -- 开始循环
    WHILE ( done is not null) DO
       FETCH cur INTO _comid;
       if done is not null then
                  --  TODU 业务代码
            call company_changeAccount(72,_comid);
       end if;
   END WHILE;
   -- 关闭游标
   CLOSE cur;
 END