yii2连接数据库失败

首先，先来看一下问题代码：

1、控制器代码如下：

    public function actionIndex()     {         $query = Country::find();           $pagination = new Pagination([             'defaultPageSize' => 5,             'totalCount' => $query->count()         ]);           $countries = $query->orderBy('name')             ->offset($pagination->offset)             ->limit($pagination->limit)             ->all();           return $this->render('index', [             'countries' => $countries,             'pagination' => $pagination,         ]);     }

（推荐教程：yii框架）

2、数据库配置文件db.php代码如下：

<?php   return [     'class' => 'yii\db\Connection',     'dsn' => 'mysql:host=localhost;dbname=yii2basic',     'username' => 'root',     'password' => '',     'charset' => 'utf8',       // Schema cache options (for production environment)     //'enableSchemaCache' => true,     //'schemaCacheDuration' => 60,     //'schemaCache' => 'cache', ];

解决方法：

将PDO连接中的dsn的host由“localhost”改为“127.0.0.1”即可，打开文件DB.PHP，修改如下：

<?php   return [     'class' => 'yii\db\Connection',     'dsn' => 'mysql:host=127.0.0.1;dbname=yii2basic',     'username' => 'root',     'password' => '',     'charset' => 'utf8',       // Schema cache options (for production environment)     //'enableSchemaCache' => true,     //'schemaCacheDuration' => 60,     //'schemaCache' => 'cache', ];

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