How to modify the database connection in yii2

Configure multiple databases:

return [
    // ...
    'components' => [
        // ...
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=example',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
    'db2' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=example',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
    ],
    // ...
];

(Recommended tutorial: yii framework)

If applied in your application If there is more than one database, and you need to use a different database connection (DB connection) for your AR class, you can override the yii\db\ActiveRecord::getDb() method:

class Customer extends ActiveRecord{    // ...
    public static function getDb()
    {
            return \Yii::$app->db2;  // 使用名为 "db2" 的应用组件
    }
}

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