PDO-bindParam不起作用 [英] PDO - bindParam not working

问题描述

我正在创建要在我的项目上使用的PDO类，但是由于它是我的新手，所以我无法将参数绑定到准备好的sql语句上，而不会出现任何错误.这是执行此操作的功能:

I'm creating a PDO class to use on my projects, but since I'm new to it I'm not being able to bind parameters to a prepared sql statement, with not error whatsoever. Here's the function that is ment to do it :

# ::bindParam
public static function bind()
{
    # get function arguments
    $args = func_get_args();

    # check for any arguments passed
    if (count($args) < 1)
    {
        return false;
    }

    foreach ($args as $params)
    {
        # named variables for convenience
        $parameter = $params[0];
        $variable = $params[1];
        $data_type = isset($params[2]) ? $params[2] : PDO::PARAM_STR;
        $length = isset($params[3]) ? $params[3] : null;

        # bind param to query
        Database::$statement->bindParam($parameter, $variable, $data_type, $length) or die('error');
    }
}

和准备好的sql语句:

and a prepared sql statement :

SELECT * FROM `users` WHERE `email` = :email AND `password` = :password LIMIT 1

有人可以指出我正确的方向吗?此时查询不会产生任何错误.请注意，我假设问题出在这里，尽管可能没有，因为我只使用bindParam()和prepare().

Can someone point me in the right direction? The query produces no errors at this point. Note that I am assuming the problem is here, although it might not, since I'm only using bindParam() and prepare().

修改-触发代码

    $email = $_POST['email'];
    $password = $_POST['password'];

    $password = hash('sha256', $password);

    $this->db->prepare('SELECT * FROM `users` WHERE `email` = :email AND `password` = :password LIMIT 1');
    $this->db->bind(
        array(':email', $email),
        array(':password', $password)
    );
    $status = $this->db->execute();

    if ($status)
    {
        $result = $this->db->fetch('assoc');

        $this->template->user = $result;
    }
    else
    {
        $this->template->user = false;
    }

推荐答案

正如@YourCommonSense所述，原始PDO接口更加清晰，但是问题可能是由于使用了功能

As @YourCommonSense already mentioned, raw PDO interface is a little bit clearer, however the problem is probably due to the use of function PDOStatement::bindParam() instead of PDOStatement::bindValue().

这两者之间的区别在于，第一个使用变量引用，它会在您的foreach循环中不断被覆盖，而最后一个则取变量的实际值.

The difference between those two is that, the first one takes a variable reference, which is constantly overwritten in your foreach loop, while the last one takes the actual value of the variable.

如果您正在寻找更友好的数据库连接界面，为什么不尝试 Docal DBAL ?

If you're looking for some more friendly database connection interface, why won't you try Doctrine DBAL?

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