PDO 在 PHP5.4 中以字符串形式返回整数列

2021-12-26 00:00:00 php mysql pdo

首先，我知道关于 SO 有各种类似的问题，例如 this 和 这个.但是，当我从表中获取值时，整数总是作为字符串获取.

First of all, I am aware that there are various similar questions on SO such as this and this. However, when I fetch values from a table, integers are always fetched as string.

我使用的是 PHP5.4 (5.4.16-1~dotdeb.1) 和 MYSQL5.5 (5.5.31+dfsg-0+wheezy1).这里 写到 PHP5 默认启用 MySQL Native Driver.4.0.但我仍然得到字符串值.

I am using PHP5.4 (5.4.16-1~dotdeb.1) and MYSQL5.5 (5.5.31+dfsg-0+wheezy1). It is written here that MySQL Native Driver is enabled by default in PHP5.4.0. But I still get string values.

我按如下方式初始化一个 PDO 对象.

I initialize a PDO object as follows.

try {
        $dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME . ';charset=utf8';

        $db = new PDO($dsn,DB_USER,DB_PASS);

        $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
    } catch (PDOException $e) {
        header('HTTP/1.1 500');
        exit;
    } catch (Exception $e) {
        header('HTTP/1.1 500');
        exit;
    }

当我插入时，我尝试使用 execute(array(...)) 格式并且还使用了 bindValue(...,PDO::PARAM_INT)，但它们没有任何区别.

When I insert, I tried to use execute(array(...)) format and also used bindValue(...,PDO::PARAM_INT), but they did not make a difference.

例如，这是我插入新行的方法.

For example, here is how I insert a new row.

public function insertList ($db,$account_id,$list_name) {
    $sql = $db->prepare('INSERT INTO lists VALUES (?,?,?,?,?)');

    try {
        // $sql->execute(array($list_name,0,0,0,$account_id));

        $sql->bindValue(1,$list_name,PDO::PARAM_STR);
        $sql->bindValue(2,0,PDO::PARAM_INT);
        $sql->bindValue(3,0,PDO::PARAM_INT);
        $sql->bindValue(4,0,PDO::PARAM_INT);
        $sql->bindValue(5,$account_id,PDO::PARAM_INT);
        $sql->execute();
    } catch (PDOException $e) {
        header('HTTP/1.1 500');
        exit;
    } catch (Exception $e) {
        header('HTTP/1.1 500');
        exit;
    }
}

这是我如何从表中获取行

Here is how I fetch rows from a table

public function fetchLists ($db,$account_id) {
    $sql = $db->prepare('SELECT * FROM lists WHERE account_id=?');

    try {
        $sql->execute(array($account_id));

        $result = $sql->fetchAll(PDO::FETCH_ASSOC);
    } catch (PDOException $e) {
        header('HTTP/1.1 500');
        exit;
    } catch (Exception $e) {
        header('HTTP/1.1 500');
        exit;
    }

    return $result;
}

当我在使用 PHP5.4.7 的 XAMPP for Linux 1.8.1 上测试时没有发生这种情况.我目前使用 nginx 而不是 Apache.

This did not occur when I tested on XAMPP for Linux 1.8.1 which uses PHP5.4.7. I currently use nginx instead of Apache.

怎么了?

推荐答案

要从带有 PDO 的 mysql 获取具有各自类型的整数和浮点数，您需要同时关闭基于 mysqlnd 的 PDO-mysql 和仿真模式.

To get integers and floats with respective types from mysql with PDO, you need both mysqlnd-based PDO-mysql and emulation mode turned off.

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