流明 - 在运行时创建数据库连接

Question

在Lumen项目中,我需要在运行时创建数据库连接,但每次尝试使用最近创建的连接时,我都会收到"Database [...] not configured"错误.

这是我在routes.php上的测试代码:

<?php

$app->get('/', function () use ($app) {

    $config = $app->make('config');
    $config->set('database.connections.retail_db', [
        'driver'   => 'pgsql',
        'host'     => env('RETAIL_DB_HOST', 'localhost'),
        'port'     => env('RETAIL_DB_PORT', 5432),
        'database' => env('RETAIL_DB_DATABASE', 'forge'),
        'username' => env('RETAIL_DB_USERNAME', 'forge'),
        'password' => env('RETAIL_DB_PASSWORD', ''),
        'charset'  => env('RETAIL_DB_CHARSET', 'utf8'),
        'prefix'   => env('RETAIL_DB_PREFIX', ''),
        'schema'   => env('RETAIL_DB_SCHEMA', 'public'),
    ]);
    return app('db')->connection('retail_db')->select("SELECT * FROM users");

});

这段代码应该适用于Laravel,但我找不到任何有关Lumen的信息.

我正在使用最新的流明版本.

Answer 1

您要使用的方法存在一个主要问题:

您没有初始化任何配置对象.默认情况下,流明没有传统的配置对象集,直到您config在根文件夹中创建目录.

正如Lumen配置文档中所写:

Lumen框架的所有配置选项都存储在.env文件中.

您要采用的方法需要Laravel中使用的传统配置对象.

要使该对象和新retail_db数据库连接正常工作:

• config在项目根目录中创建一个文件夹
• 将文件复制vendor/laravel/lumen-framework/config/database.php到此配置文件夹
• 在bootstrap/app.phpwith中初始化数据库配置对象$app->configure('database');(将其放在第28行)

您的文件夹结构现在看起来像这样:

??? app
??? bootstrap
??? config
   ??? database.php
??? database
??? public
??? resources
??? storage
??? tests
??? vendor

当然,您可以app/config/database.php通过注释或完全删除连接数组来删除不需要的连接.

应用程序/配置/ database.php中

'connections' => [

        /*'testing' => [
            'driver' => 'sqlite',
            'database' => ':memory:',
        ],*/

        'sqlite' => [
            'driver'   => 'sqlite',
            'database' => env('DB_DATABASE', base_path('database/database.sqlite')),
            'prefix'   => env('DB_PREFIX', ''),
        ],

        'mysql' => [
            'driver'    => 'mysql',
            'host'      => env('DB_HOST', 'localhost'),
            'port'      => env('DB_PORT', 3306),
            'database'  => env('DB_DATABASE', 'forge'),
            'username'  => env('DB_USERNAME', 'forge'),
            'password'  => env('DB_PASSWORD', ''),
            'charset'   => env('DB_CHARSET', 'utf8'),
            'collation' => env('DB_COLLATION', 'utf8_unicode_ci'),
            'prefix'    => env('DB_PREFIX', ''),
            'timezone'  => env('DB_TIMEZONE', '+00:00'),
            'strict'    => env('DB_STRICT_MODE', false),
        ],
]

您的bootstrap/app.php包含更改:

/*
|--------------------------------------------------------------------------
| Create The Application
|--------------------------------------------------------------------------
|
| Here we will load the environment and create the application instance
| that serves as the central piece of this framework. We'll use this
| application as an "IoC" container and router for this framework.
|
*/

$app = new Laravel\Lumen\Application(
    realpath(__DIR__.'/../')
);

//$app->withFacades();
// $app->withEloquent();

$app->configure('database');

现在,您可以使用已有的代码routes.php.

要删除您的retail_db连接,只需将其设置为null:

$config->set('database.connections.retail_db', null);