laravel數據庫連接問題

1.修改配置文件/.nev

DB_HOST=127.0.0.1     //數據庫地址
DB_PORT=3306          //數據庫端口
DB_DATABASE=database  //數據庫名稱
DB_USERNAME=root      //數據庫賬號
DB_PASSWORD=root      //數據庫密碼

2.開始測試是否連接成功

/App/Http/routes.php 路由代碼如下（可以自定義）

Route::get('dbtest','Admin\IndexController@dbtest');

3.新建IndexController控制器

/App/Http/Controllers/IndexController 控制器代碼如下（可以自定義）

<?php
namespace App\Http\Controllers\Admin;
use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\DB;

class IndexController extends Controller{

   public function dbcc(){
       $pdo=DB::connection()->getPdo();
         dd($pdo);
   }

}

4.瀏覽訪問測試

瀏覽器訪問http://127.0.0.1/index.php/dbtest 成功提示如下圖

PDO {#123 ▼
  inTransaction: false
  attributes: {▼
    CASE: NATURAL
    ERRMODE: EXCEPTION
    AUTOCOMMIT: 1
    PERSISTENT: false
    DRIVER_NAME: "mysql"    SERVER_INFO: "Uptime: 3026  Threads: 4  Questions: 476  Slow queries: 0  Opens: 42  Flush tables: 1  Open tables: 1  Queries per second avg: 0.157"    ORACLE_NULLS: NATURAL
    CLIENT_VERSION: "mysqlnd 5.0.11-dev - 20120503 - $Id: f373ea5dd5538761406a8022a4b8a374418b240e $"    SERVER_VERSION: "5.5.40"    STATEMENT_CLASS: array:1 []    CONNECTION_STATUS: "127.0.0.1 via TCP/IP"    DEFAULT_FETCH_MODE: BOTH
  }}

遇到常見問題;

 1.如果你的數據庫表有前綴怎么處理

   1.1/config/database.php找打如下代碼

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

   1.2修改成如下代碼

        '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', ''),
            'prefix' => env('DB_PREFIX', ''),
            'charset' => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'strict' => false,
            'engine' => null,
        ],

     1.3配置文件/.nev修改成如下代碼

        DB_HOST=127.0.0.1    //數據庫地址        
        DB_PORT=3306      //數據庫端口
        DB_DATABASE=database  //數據庫名稱
        DB_PREFIX=unics_    //數據庫表前綴名稱
        DB_USERNAME=root    //數據庫賬號
        DB_PASSWORD=root    //數據庫密碼