'yii\db\Connection', 'dsn' => "mysql:host=$host;dbname=".$database, 'username' => $user, 'password' => $password, 'charset' => 'utf8', 'attributes' => [PDO::ATTR_CASE => PDO::CASE_LOWER], // Schema cache options (for production environment) //'enableSchemaCache' => true, //'schemaCacheDuration' => 60, //'schemaCache' => 'cache', ];