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我正在使用波纹管查询进行更新，但现在我尝试将其更改为 pdo 并且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();
}

}

?>
4

4 回答 4

5 
// 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']);
于 2013-02-26T15:45:46.173 回答
5

首先，连接到 bootstrap/config 文件中的某处：

$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)就足够了）

于 2013-02-26T15:46:39.383 回答
3 
$stmt = $db->prepare("UPDATE site_user SET dateupdated=now(), ip=? WHERE username=?");
$stmt->execute(array($ip, $_SESSION['username']));
$affected_rows = $stmt->rowCount();

$db你的连接在哪里

再次：一个很棒的教程

于 2013-02-26T15:47:33.840 回答
2 
function updateonlinesession(){
    if(isset($_SESSION['username']['id'])){
        $uid = $_SESSION['username']['id'];
        $page = $_SERVER['REQUEST_URI'];
        $ip = $_SERVER['REMOTE_ADDR'];
        $username = $_SESSION['logged'];

        //Establish your PDO object.
        $pdo = new PDO("mysql:host=localhost;dbname=mydb", "username", "password");

        //Prepare your statement.
        $stmt = $pdo->prepare("UPDATE site_user SET dateupdate = now(), ip = ? WHERE username = ?");
        $stmt->execute(array(
            $ip,
            $_SESSION['username']
        ));
        $stmt->closeCursor();
    }
}
于 2013-02-26T15:46:48.910 回答