致命错误:使用PDO中的临时表在布尔值上调用成员函数bind_param()

时间:2019-03-20 18:20:34

标签: php pdo

所以我有 2 个表: admin和employee ,只有 2个列,它们在同一列中共享

一个登录表单

和每个单独的2个仪表板

为了将它们临时放在一个表中,我将它们与 UNION 合并在一起,并添加了一个临时列以定义用户类型,并因此登录到正确的仪表板。

因此,在经过很长时间的搜索和许多错误之后,才使这种情况发生 我得出的结论是,作为该领域的新手,这是我能做的最好的事情。

这就是我最后的作品:

    // preparing a temporary table that unions the admin and employee tables
$TMP = "SELECT EMP_ID AS ID, EMP_EMAIL AS EMAIL, 2 AS TYPE FROM employee
                        UNION
                        SELECT ID, EMAIL, 1 AS TYPE FROM admin ";
$result = $con->prepare($TMP);                      
$result-> execute();
$result-> store_result();
$result-> fetch();

    // preparing select statement for logging in
$stmt = $con->prepare('SELECT `TYPE` FROM `".$result."` WHERE `ID` = ?');
    // Bind parameters (s = string, i = int, b = blob, etc), in our case the username is a string so we use "s"
    $stmt->bind_param('i', $_POST['ID']);
    $stmt->execute();
    // Store the result so we can check if the account exists in the database.
    $stmt->store_result();
    if ($stmt->num_rows > 0) {
    $stmt->bind_result($ID);
    $stmt->fetch();
    }
        if ($stmt['TYPE'] == 1) {
            if ($_POST['ID'] == $ID) {
        // Verification success! User has loggedin!
        // Create sessions so we know the user is logged in, they basically act like cookies but remember the data on the server.
            session_regenerate_id();
            $_SESSION['loggedin'] = TRUE;
            $_SESSION['email'] = $_POST['EMAIL'];
            $_SESSION['id'] = $ID;
            echo 'Welcome ' . $_SESSION['email'] . '!';
        } else {
        echo 'Incorrect password!';
    }
        } else if ($stmt['TYPE'] == 2) {
    if ($_POST['ID'] == $ID) {
        // Verification success! User has loggedin!
        // Create sessions so we know the user is logged in, they basically act like cookies but remember the data on the server.
        session_regenerate_id();
        $_SESSION['loggedin'] = TRUE;
        $_SESSION['email'] = $_POST['EMAIL'];
        $_SESSION['id'] = $ID;
        echo 'Welcome ' . $_SESSION['email'] . '!';
    } else {
        echo 'Incorrect password!';
    }
        }
    $stmt-> close();



$result-> close();
$con-> close();

所使用的代码来自用于记录一个用户的教程,并且对我来说运行良好 但是由于我的目标不同,因此我尝试根据自己的需要对其进行修改,但不幸的是,关于绑定参数的致命错误不断弹出。

我非常感谢您抽出一些时间。 谢谢。

1 个答案:

答案 0 :(得分:2)

问题出在外引号'"

当准备好的语句失败时,它将返回一个布尔值(false)。

Documentation

  

mysqli_prepare()返回一个语句对象,如果发生错误则返回FALSE。

我认为您的意思是这样写:

$stmt = $con->prepare("SELECT `TYPE` FROM `".$result."` WHERE `ID` = ?");