获取 MySQL 更新语句中受影响的行数？

Question

I have stored procedure in MySQL, something like the below:

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

How can I determine how many rows were changed by this update?

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'

Answer 3

试试下面的代码：

int mysql_affected_rows ([ resource $link_identifier = NULL ] )