yii2链接mongodb return [ 'class' = 'yii\mongodb\Connection', 'dsn' = 'mongodb://账户:密码@域名或者ip：端口/?replicaSet=kjjyreadPreference=nearest/数据库名',];
return [
'class' => 'yii\mongodb\Connection',
'dsn' => 'mongodb://账户:密码@域名或者ip：端口/?replicaSet=kjjy&readPreference=nearest/数据库名',
];