获取MySQL更新语句中受影响的行数？

Question

我在MySQL中存储过程,如下所示:

create procedure SP_Test (input1 varchar(20))
begin
update Table1 set Val1='Val' where country=input1;
//I want to see if this update changed how many rows and 
//do some specific action based on this number
....
end

如何确定此更新更改了多少行？

Answer 1

使用ROW_COUNT():

SELECT ROW_COUNT();

Answer 2

一种不太理想的方法是在更新之前简单地进行选择。

select count(*) from table1 where country = 'country1'