laravel数据库连接问题

1.修改配置文件/.nev

DB_HOST=127.0.0.1     //数据库地址DB_PORT=3306          //数据库端口DB_DATABASE=database  //数据库名称DB_USERNAME=root      //数据库账号DB_PASSWORD=root      //数据库密码

2.开始测试是否连接成功

/App/Http/routes.php 路由代码如下（可以自定义）

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

3.新建IndexController控制器

/App/Http/Controllers/IndexController 控制器代码如下（可以自定义）

getPdo();         dd($pdo);   }}

4.浏览访问测试

浏览器访问http://127.0.0.1/index.php/dbtest 成功提示如下图

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  }}

遇到常见问题;

1.如果你的数据库表有前缀怎么处理

1.1/config/database.php找打如下代码

      '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修改成如下代码

        '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修改成如下代码

        DB_HOST=127.0.0.1    //数据库地址                DB_PORT=3306      //数据库端口        DB_DATABASE=database  //数据库名称        DB_PREFIX=unics_    //数据库表前缀名称        DB_USERNAME=root    //数据库账号        DB_PASSWORD=root    //数据库密码