Question

我正在使用laravel 5，我想从数据库中获取数据，但它会抛出以下错误：

LearnController.php第38行中的FatalErrorException：未找到类'App \ Http \ Controllers \ DB'

我已经添加了数据库详细信息，然后我也可以从ads_new表

获取标题

这是我的代码：

<?php 

namespace App\Http\Controllers;

class LearnController extends Controller {

    /*
    |--------------------------------------------------------------------------
    | Home Controller
    |--------------------------------------------------------------------------
    |
    | This controller renders your application's "dashboard" for users that
    | are authenticated. Of course, you are free to change or remove the
    | controller as you wish. It is just here to get your app started!
    |
    */

    /**
     * Create a new controller instance.
     *
     * @return void
     */


    /**
     * Show the application dashboard to the user.
     *
     * @return Response
     */

    public function home()
    {   
        $users = DB::table('ads_new')->get();

        foreach ($users as $user)
        {
            var_dump($user->title);
        }                       
    }    
}

database.php中

<?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_CLASS,

/*
|--------------------------------------------------------------------------
| 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' => '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' => storage_path().'/database.sqlite',
        'prefix'   => '',
    ],

    'mysql' => [
        'driver'    => 'mysql',
        'host'      => env('DB_HOST', 'localhost'),
        'database'  => env('DB_DATABASE', 'autoclick'),
        'username'  => env('DB_USERNAME', 'root'),
        'password'  => env('DB_PASSWORD', ''),
        'charset'   => 'utf8',
        'collation' => 'utf8_unicode_ci',
        'prefix'    => '',
        'strict'    => false,
    ],

    'pgsql' => [
        'driver'   => 'pgsql',
        'host'     => env('DB_HOST', 'localhost'),
        'database' => env('DB_DATABASE', 'autoclick'),
        'username' => env('DB_USERNAME', 'root'),
        'password' => env('DB_PASSWORD', 'root'),
        'charset'  => 'utf8',
        'prefix'   => '',
        'schema'   => 'public',
    ],

    'sqlsrv' => [
        'driver'   => 'sqlsrv',
        'host'     => env('DB_HOST', 'localhost'),
        'database' => env('DB_DATABASE', 'autoclick'),
        'username' => env('DB_USERNAME', 'root'),
        'password' => env('DB_PASSWORD', ''),
        'prefix'   => '',
    ],

],

/*
|--------------------------------------------------------------------------
| 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'     => '127.0.0.1',
        'port'     => 6379,
        'database' => 0,
    ],

  ],

];

Answer 1

DBfaçade位于全局命名空间中，因此您需要将其导入控制器顶部：

<?php namespace App\Http\Controllers;

use DB;

阅读PHP中的命名空间：http://php.net/manual/en/language.namespaces.php

Answer 2

试试这个解决方案：

来自Matt Burrow评论
在DB之前添加一个\就像这样; \ DB或添加use \ DB;在顶部。

所以应该是这样的：

class LearnController extends Controller {

public function home()
{

$users = \DB::table('ads_new')->get();

    foreach ($users as $user)
    {
    var_dump($user->title);
    }

}

}

laravel5中的FatalErrorException

2 个答案:

试试这个解决方案：