如何将更新查询从mysql更改为pdo？

Question

我正在使用bellow查询更新,但现在我尝试将其更改为pdo,但它无法正常工作请任何帮助将不胜感激

 function updateonlinesession(){            
    if(isset($_SESSION['username']['id'])){
    $uid = $_SESSION['username']['id'];
    $page = $_SERVER['REQUEST_URI'];
    $ip = $_SERVER['REMOTE_ADDR'];
    $username = $_SESSION['logged'];

    mysql_query("UPDATE site_user SET dateupdated  = now(),ip = '$ip' WHERE 
    username = '".mysql_real_escape_string($_SESSION['username'])."'"); 
    }

    }   

这是我用pdo尝试过的

function updateonlinesession(){         
if(isset($_SESSION['username']['id'])){
$uid = $_SESSION['username']['id'];
$page = $_SERVER['REQUEST_URI'];
$ip = $_SERVER['REMOTE_ADDR'];
$username = $_SESSION['logged'];

$update = ("UPDATE site_user SET dateupdated  = now(),ip = '$ip' WHERE 
username = '".($_SESSION['username'])."'");
$sth_update= $con->prepare($update);
$sth_update->execute();
}

}

?>

Answer 1

// connetion
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass);

// query
$sql = "UPDATE site_user SET dateupdated = NOW(), ip = ?
        WHERE username = ?";
$q = $conn->prepare($sql);
$q->execute(array($ip, $_SESSION['username']);

Answer 2

首先,连接bootstrap/config文件中的某个地方:

$dsn = 'mysql:dbname=test;host=localhost;charset=utf8';
$opt = array(
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
$pdo = new PDO($dsn, $user, $pass, $opt);

然后,运行您的查询

function updateonlinesession(){
    global $pdo;
    if(isset($_SESSION['username']['id'])){
        $sql = "UPDATE site_user SET dateupdated=now(),ip=? WHERE username=?"; 
        $pdo->prepare($sql);
        $pdo->execute(array($_SERVER['REMOTE_ADDR'], $_SESSION['logged']));
    }
}

确保您使用的所有变量都具有正确的值(var_dump($_SESSION)足够)