php mysql 判断update之后是否更新了的方法_php技巧
首先我的建议是遇到问题摆渡一下,php手册翻上1001遍,问题迎刃而解。
我百度了一下,网友给的答案五花八门。
首先纠正百度来的一个错误的方法:
$sql = "update table a set aname='名字' where aid=88";
$r = $conn->query($sql);
if ($r){
echo "错误以为这里就是数据做了更新,如果这个aid为88的数据不存在语句同样返回true。";
}
带where的语句即使不符合调节只要sql语句没错同样返回true,这里的true可以理解为sql语句不出错,和这样写是同样的效果:$conn->query($sql) or die("更新出错,请检查参数是否正确。");。
获取update更新的多少行的函数用:mysql_affected_rows($conn) 或者用mysqli_affected_rows($conn)

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