Mysql查询结果只有一条的情况下把值赋值给变量，再用if else 流程判断

1 BEGIN
2 set @n=(SELECT count(day) from log where day=CURDATE());
3 IF @n=0 THEN
4     call m_LogInsert();
5 ELSE
6     call m_LoginCheck();
7 end if;
8 end