How to generate SqlDataProvider for 2 db connection - yii2

Question

I have a 2 DB connection, db and db2. I want to get all data from table claim in db2 connection. Below is my sql and it did not read from db2 connection. How to solved this?
$sql = "SELECT * FROM claim where provider_id = xx ";
$sql_count = "SELECT COUNT FROM ( $sql ) AS count ";
$totalCount = Yii::$app->db2->createCommand($sql_count)->queryScalar();
$dataProvider = new SqlDataProvider([
'sql' => $sql,
'totalCount' => $totalCount,
'sort' =>false,
'pagination' => [
'pageSize' => 10,
],
]);
return $dataProvider;

Answer 1

First you need to configure your databases like below:
return [
'components' => [
'db1' => [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=localhost;dbname=db1name', //maybe other dbms such as psql,...
'username' => 'db1username',
'password' => 'db1password',
],
'db2' => [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=localhost;dbname=db2name', //maybe other dbms such as psql,...
'username' => 'db2username',
'password' => 'db2password',
],
],
];
Then you can simply :
//to get from db1
Yii::$app->db1->createCommand((new \yii\db\Query)->select('*')->from('tbl_name'))->queryAll()
//to get from db2
Yii::$app->db2->createCommand((new \yii\db\Query)->select('*')->from('tbl_name'))->queryAll()
If you are using an active record model, in your model you can define:
public function getDb() {
return Yii::$app->db1;
}
//Or db2
public function getDb() {
return Yii::$app->db2;
}
Then:
if you have set db1 in getDb() method, result will be fetched from db1 and so on.
ModelName::find()->select('*')->all();