如何使用Codeigniter选择不同的mongodb数据库

Question

I am very new to using mongodb via Codeigniter. I have noticed some active records for Mongodb is very similar to the sql for instance

$this->db->get('mytable');
$this->mongo_db->get('mytable');

However I ran into a problem where the distinct does not work:

$this->mongo_db->distinct('name');
$this->mongo_db->get('mytable');

Been searching around for this but couldn't find anything, is there a way for this?

Many thanks

Answer 1

I working with this library for CodeIgniter ( https://github.com/alexbilbie/codeigniter-mongodb-library ), and there exists the method: switch_db($db_name);

Then with the get you can choose witch collection (in MongoDB tables are collections), like you did in your example:

$this->mongo_db->get('collection_name');

Answer 2

You can use :

$this->mongo_db->distinct('collection', 'field_name');

It will help you to find distict value from collection. make sure you have installed mongo_db library.