封装一个简单的PHP连接MongoDB类

<?php

class MongoDB
{

private $database;
private $mongo;

function __construct()
{
$this->mongo  = new MongoClient("mongodb://user:password@server_address:port/admin");
$this->database = $this->mongo->selectDB("data");
}

{
return $this->database->selectCollection($collection);
}
//获取所有的集合名
function getCollections()
{
return $this->database->getCollectionNames();
}
//选数据库
function selectDB($db)
{
$this->database = $this->mongo->selectDB($db);
}

}

class DemoController extends CI_Controller
{
function __construct() {
parent::__construct();
//CI中加载类
$this->load->library('mongo_lib', '', 'mongodb');
}

//插入一条数据
function create()
{
$data = array('name'=>'mike','email'=>'abc@163.com);
//选择库，shell：user demo_db
$this->mongodb->selectDB('demo_db');
//选择集合,db.demo_col.insert();
$rebateCollection = $this->mongodb->getCollection('demo_collection');
$res = $rebateCollection->insert($data);
}

}