Yii 2.0 : 2 database connection

Question

I read this question yii 2.0 multiple database connection , and use the answer of @Ali MasudianPour.

I follow the first step:

First you need to configure your databases like below:

return [
    'components' => [
        'db1' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=database1',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
        'db2' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=database2',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
    ],
]; ?>

But in my configuration in my db it gives me this error:

The configuration for the "db" component must contain a "class" element.

Answer 1

This is because db component is main and required and you simply omitted its declaration.

Rename db1 and db2 for example to db and db1 accordingly:

return [
    'components' => [
        // Main connection
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=database1',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
        // Another connection
        'db1' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=database2',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
        ],
    ],
]; ?>

Update:

Note that for the basic application db is configured in separate file config/db.php and then required in main config config/web.php like so:

'db' => require(__DIR__ . '/db.php'),

So you can configure main connection in db.php and add additional below as db1 .

Answer 2

Simply you just have to create separate file for each database .

1. config/db ->

    'class' => 'yii\\db\\Connection', 'dsn' => 'mysql:host=localhost;dbname=database1', 'username' => 'root', 'password' => '', 'charset' => 'utf8', 

   To access another db create file in config named db1.php add add another db configuration.

2. config/db1 ->

    'class' => 'yii\\db\\Connection', 'dsn' => 'mysql:host=localhost;dbname=database2', 'username' => 'root', 'password' => '', 'charset' => 'utf8', 

3. In config->web.php add

    'db' => require(__DIR__ . '/db.php'), 'db1' => require(__DIR__ . '/db1.php'), 

4. To access the Model:

    public static function getDb() { return Yii::$app->db1; }