YII 錯誤 SQLSTATE[HY000] [2002] No such file or directory

在使用yii的yii\db\Connnection時發生錯誤

<?php
namespace app\controllers;

use yii\web\Controller;
use yii\db\Connection;
use Yii;

class MyController extends Controller
{
    public function actionIndex()
    {
        $country = Yii::$app -> db -> createCommand("select * from country") -> queryAll();
        print_r($country);
    }
}

錯誤:

解決方法:將config目錄下的db.php配置文件中的localhost改成127.0.0.1便可

<?php

return [
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=localhost;dbname=yii',
    'username' => 'root',
    'password' => '12',
    'charset' => 'utf8',
];

當主機填寫爲localhost時mysql會採用 unix domain socket鏈接

當主機填寫爲127.0.0.1時mysql會採用tcp方式鏈接

這是linux套接字網絡的特性，win平臺不會有這個問題