MySQL游标

创建游标

DECLARE cursor_name CURSOR FOR select_statement;

使用游标

OPEN光标

OPEN cursor_name;

FETCH光标

FETCH cursor_name INTO var_name [, var_name] ...

CLOSE光标

CLOSE cursor_name;

循环获取游标

DECLARE emp_reault cursor for select * from emp;
DECLARE EXIT HANDLER FOR NOT FOUND set has_data=0;

然后判断has_data来退出循环。