Specify a database connection on a per-model basis by declaring instance variable

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The class will automatically use the default database connection, and even load it for you if you haven't yet.

You can specify a database connection on a per-model basis by declaring the _$database instance variable. This is equivalent to calling $this->db->database($this->_database, TRUE).

class Post_model extends MY_Model
{
    public $_database = 'group_name';
}