問題描述

我遇到了一個問題.我的框架在 PHP 5.3.0 上工作得很好.我將 PHP 版本升級到 PHP 5.4.x，并且我的框架的某些部分開始出現(xiàn)一些問題.

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版本升級后，PDO lastInsterId()總是返回0.

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

我有一個名為 id 的自增字段.它正在將數(shù)據(jù)添加到數(shù)據(jù)庫中，沒有任何問題.

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

出于某種原因，我一直將 0 作為最后一個插入 id.

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

這是我的代碼；

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);
    }

首先調(diào)用create()方法，然后調(diào)用crudQuery()方法.正如我之前提到的，我可以成功地將數(shù)據(jù)添加到 MySQL 數(shù)據(jù)庫中.不幸的是，當我調(diào)用 lastInsterID() 方法時，它總是返回 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 查詢獲得最后一個 ID 之前幫我解決這個問題，我將非常高興 (:

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

推薦答案

除了 php/PDO 或您的框架中的錯誤之外，還有兩種可能性.lastInsertId() 在與插入不同的 MySQL 連接上調(diào)用，或者您在應(yīng)用程序/框架中生成 id 并插入它，而不是讓 auto_increment 為您生成它.表中哪一列是主鍵/auto_increment?該列是否包含在 create() 函數(shù)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?

您可以測試 PDO 以確保該部分使用此代碼(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');

當我運行這個腳本時，輸出是

When I ran this script, the output was

string(1) "1"

這篇關(guān)于PDO lastInsertId() 總是返回 0的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！