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 [
    &#39;class&#39; => &#39;yii\db\Connection&#39;,
    &#39;dsn&#39; => &#39;mysql:host=localhost;dbname=yii2basic&#39;,
    &#39;username&#39; => &#39;root&#39;,
    &#39;password&#39; => &#39;&#39;,
    &#39;charset&#39; => &#39;utf8&#39;,
 
    // Schema cache options (for production environment)
    //&#39;enableSchemaCache&#39; => true,
    //&#39;schemaCacheDuration&#39; => 60,
    //&#39;schemaCache&#39; => &#39;cache&#39;,
];

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 [
    &#39;class&#39; => &#39;yii\db\Connection&#39;,
    &#39;dsn&#39; => &#39;mysql:host=127.0.0.1;dbname=yii2basic&#39;,
    &#39;username&#39; => &#39;root&#39;,
    &#39;password&#39; => &#39;&#39;,
    &#39;charset&#39; => &#39;utf8&#39;,
 
    // Schema cache options (for production environment)
    //&#39;enableSchemaCache&#39; => true,
    //&#39;schemaCacheDuration&#39; => 60,
    //&#39;schemaCache&#39; => &#39;cache&#39;,
];

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