找不到驱动程序

Question

我将项目从旧主机移至新主机 我尝试了几次，但每次尝试时，Laravel 都会显示此错误：

找不到驱动程序 (SQL: select * from orders where status not 在 (PENDING, COMPLETED) 和 api_order_id 不是 RAND() 限制 15) 的空订单)

我确定我完全上传了我的数据库并且我正确地放置了我的数据库信息 那么为什么会出现这个错误呢？

Config/database.php 代码：

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | PDO Fetch Style
    |--------------------------------------------------------------------------
    |
    | By default, database results will be returned as instances of the PHP
    | stdClass object; however, you may desire to retrieve records in an
    | array format for simplicity. Here you can tweak the fetch style.
    |
    */

    'fetch' => PDO::FETCH_OBJ,

    /*
    |--------------------------------------------------------------------------
    | Default Database Connection Name
    |--------------------------------------------------------------------------
    |
    | Here you may specify which of the database connections below you wish
    | to use as your default connection for all database work. Of course
    | you may use many connections at once using the Database library.
    |
    */

    'default' => env('DB_CONNECTION', 'mysql'),

    /*
    |--------------------------------------------------------------------------
    | Database Connections
    |--------------------------------------------------------------------------
    |
    | Here are each of the database connections setup for your application.
    | Of course, examples of configuring each database platform that is
    | supported by Laravel is shown below to make development simple.
    |
    |
    | All database work in Laravel is done through the PHP PDO facilities
    | so make sure you have the driver for your particular database of
    | choice installed on your machine before you begin development.
    |
    */

    'connections' => [

        'sqlite' => [
            'driver' => 'sqlite',
            'database' => env('DB_DATABASE', database_path('database.sqlite')),
            'prefix' => '',
        ],

        'mysql' => [
            'driver' => 'mysql',
            'port' => env('DB_PORT', '3306'),
            'host' => 'localhost',
            'database' => 'my_db_name',
            'username' => 'db_user',
            'password' => 'db_pass',
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => true,
            'engine' => null,
            'modes' => [
                'STRICT_TRANS_TABLES',
                'NO_ZERO_IN_DATE',
                'NO_ZERO_DATE',
                'ERROR_FOR_DIVISION_BY_ZERO',
                'NO_AUTO_CREATE_USER',
                'NO_ENGINE_SUBSTITUTION'
            ]
        ],

        'pgsql' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
            'sslmode' => 'prefer',
        ],

    ],

    /*
    |--------------------------------------------------------------------------
    | Migration Repository Table
    |--------------------------------------------------------------------------
    |
    | This table keeps track of all the migrations that have already run for
    | your application. Using this information, we can determine which of
    | the migrations on disk haven't actually been run in the database.
    |
    */

    'migrations' => 'migrations',

    /*
    |--------------------------------------------------------------------------
    | Redis Databases
    |--------------------------------------------------------------------------
    |
    | Redis is an open source, fast, and advanced key-value store that also
    | provides a richer set of commands than a typical key-value systems
    | such as APC or Memcached. Laravel makes it easy to dig right in.
    |
    */

    'redis' => [

        'cluster' => false,

        'default' => [
            'host' => env('REDIS_HOST', '127.0.0.1'),
            'password' => env('REDIS_PASSWORD', null),
            'port' => env('REDIS_PORT', 6379),
            'database' => 0,
        ],

    ],

    'installed' => '1',
    'transfer_mode' => '%transfer_mode%',
];

.env 文件代码：

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=my_db_name
DB_USERNAME=db_user
DB_PASSWORD=db_pass

Answer 1

MySQL 是数据库，php 使用 pdo_mysql 之类的扩展名来连接 PHP 和 MySQL。首先驱动程序和扩展是不同的。驱动程序为mysqlnd 或mysqlnd，而扩展程序为pdo_mysql 或nd_pdo_mysql 等。首先检查驱动程序是否安装正确。

检查扩展名的步骤：

1. 如果您看到pdo_mysql 已启用，请签入phpinfo()。
2. 有时托管主机（主要是带有 cpanel 的主机）默认启用其 sql 扩展。在 php 扩展部分中检查 phpinto 以获取 _mysql。检查您是否看到任何其他启用的扩展程序，例如 nd_pdo_mysql。如果是这种情况，那么您会注意到冲突。您需要先禁用它，然后再尝试启用pdo_mysql。
3. 重新启动您的 PHP 服务，如果正常，您可以再试一次。