如何从PHP获取SQL中受影响的行

Question

我写下了以下代码。但是，当我尝试获取受影响的行（以检查用户详细信息是否与数据库的行匹配）时，即使语句成功执行，它也总是返回0作为受影响的行。.我做错了什么？

if($connection){

$username = "admin";
$password = "admin";

$statement = mysqli_prepare($connection,"SELECT * FROM  `admin` WHERE username = ? AND password = ?");

mysqli_stmt_bind_param($statement,"ss",$username,$password);
mysqli_stmt_execute($statement);

if(mysqli_affected_rows($connection) == 1){
    $response = array('response'=>true);
}else{
    $response = array('response'=>false);
}

echo json_encode($response);

mysqli_stmt_close($statement);
mysqli_close($connection);     }

Answer 1

使用mysqli_stmt_affected_rows（）函数，该函数将一条语句作为参数：

更改

if(mysqli_affected_rows($connection) == 1)

至

if(mysqli_stmt_affected_rows($stmt) != 0)