PDO lastInsertId() 总是返回 0

问题描述

我遇到了一个问题.我的框架在 PHP 5.3.0 上工作得很好.我将 PHP 版本升级到 PHP 5.4.x，并且我的框架的某些部分开始出现一些问题.

I've come across with a problem. My framework was working just fine with PHP 5.3.0. I upgraded my PHP version to PHP 5.4.x and I started to have few issues with some parts of my framework.

PHP版本升级后，PDO lastInsterId()总是返回0.

After PHP version upgrade, PDO lastInsterId() always returns 0.

我有一个名为 id 的自增字段.它正在将数据添加到数据库中，没有任何问题.

I have auto-increment field called id. It is adding the data to database without any problems.

出于某种原因，我一直将 0 作为最后一个插入 id.

For some reason I keep getting 0 as last insert id.

这是我的代码；

databaseobjects.php

public static function create () {
        global $db;
        $attributes = self::sanitize(static::$fields);

        $sql  = "INSERT INTO ".PREFIX.static::$table_name." (";
        $sql .= join(", ", array_keys($attributes));
        $sql .= ") VALUE (:";
        $sql .= join(", :", array_keys($attributes));
        $sql .= ")";

        return ($db->crudQuery($sql, $attributes)) ? true : false;
    }

public static function lastInsertID () {
        global $db;
        return $db->handler->lastInsertId();
    }

database.php

public function crudQuery($sql, $data) {
        $sth = $this->handler->prepare($sql);
        return $sth->execute($data);
    }

首先调用create()方法，然后调用crudQuery()方法.正如我之前提到的，我可以成功地将数据添加到 MySQL 数据库中.不幸的是，当我调用 lastInsterID() 方法时，它总是返回 0.

First create() method is called, then crudQuery() method is called. As I mentioned before, I can add the data successfully to MySQL database. Unfortunately when I call lastInsterID() method, it always returns 0.

如果您能在我使用 SQL 查询获得最后一个 ID 之前帮我解决这个问题，我将非常高兴 (:

I will be really glad if you can help me out with this problem before I will get the last ID with SQL Query (:

推荐答案

除了 php/PDO 或您的框架中的错误之外，还有两种可能性.lastInsertId() 在与插入不同的 MySQL 连接上调用，或者您在应用程序/框架中生成 id 并插入它，而不是让 auto_increment 为您生成它.表中哪一列是主键/auto_increment?该列是否包含在 create() 函数的 $attributes 中?

Other than a bug in php/PDO or your framework, there are two possibilities. Either lastInsertId() is called on a different MySQL connection than the insert, or you are generating the id in your application/framework and inserting it, rather than letting auto_increment generate it for you. Which column in the table is the primary key/auto_increment? Is that column included in $attributes in your create() function?

您可以测试 PDO 以确保该部分使用此代码(在新文件中)正常工作:

You can test PDO to make sure that part is working correctly with this code (in a new file):

// Replace the database connection information, username and password with your own.
$conn = new PDO('mysql:dbname=test;host=127.0.0.1', 'user', 'password');

$conn->exec('CREATE TABLE testIncrement ' .
            '(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50))');
$sth = $conn->prepare('INSERT INTO testIncrement (name) VALUES (:name)');
$sth->execute([':name' => 'foo']);
var_dump($conn->lastInsertId());
$conn->exec('DROP TABLE testIncrement');

当我运行这个脚本时，输出是

When I ran this script, the output was

string(1) "1"

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