mongo Table class file to obtain MongoCursor of cursor implementation method analysis

MongoCursor Object
The cursor type

Mongo
Config.php configuration file
Table. php (mongodb operates database class files)

Config. php configuration file

<?php
require_once 'Zend/Exception.php';
class Hrs_Mongo_Config
{
    const VERSION = '1.7.0';
    const DEFAULT_HOST = 'localhost';
    const DEFAULT_PORT = 27017;
    private static $host = self::DEFAULT_HOST ;
    private static $port = self::DEFAULT_PORT ;
    private static $options = array(
            'connect' => true,
            'timeout' => 30,
            //'replicaSet' => '' //If this is given, the master will be determined by using the ismaster database command on the seeds
    );
    public static $conn = '';
    public static $defaultDb = '';
    public static $linkStatus = '';
    public static function set($server = 'mongodb://localhost:27017', $options = array('connect' => true)) {
        if(!$server){
            $url = 'mongodb://'.self::$host.':'.self::$port;
        }
        if(is_array($server)){
            if(isset($server['host'])){
                self::$host = $server['host'];
            }
            if(isset($server['port'])){
                self::$port = $server['port'];
            }
            if(isset($server['user']) && isset($server['pass'])){
                $url = 'mongodb://'.$server['user'].':'.$server['pass'].'@'.self::$host.':'.self::$port;
            }else{
                $url = 'mongodb://'.self::$host.':'.self::$port;
            }
        }
        if(is_array($options)){
            foreach (self::$options as $o_k=>$o_v){
                if(isset($options[$o_k]))
                    self::$options[$o_k] = $o_v;
            }
        }
        try{                        
            self::$conn = new Mongo($url, self::$options);
            self::$linkStatus = 'success';
        }catch (Exception $e){
            self::$linkStatus = 'failed';
        }
        if(isset($server['database'])){
            self::selectDB($server['database']);
        }
    }
    public static function selectDB($database){
        if($database){
            try {
                if(self::$linkStatus=='success')
                    self::$defaultDb = self::$conn->selectDB($database);
                return self::$defaultDb;
            }
            catch(InvalidArgumentException $e) {
                throw new Zend_Exception('Mongodb The database name is incorrect ');
            }
        }else{
            throw new Zend_Exception('Mongodb The database name cannot be empty ');
        }
    }
}

Table. php (mongodb operates database class files)

<?php
require_once 'Hrs/Mongo/Config.php';
abstract class Hrs_Mongo_Table
{
    protected $_db = '';
    protected $_name = '';
    protected $_data = array();
    protected $c_options = array(
            'fsync'=>true,
            'safe'=>true
    );
    protected $u_options = array(
    //'upsert'=>false,
            'multiple'=>true,
            'fsync'=>true,
            'safe'=>true
    );
    /*
     protected $r_options = array(
     );*/
    protected $d_options = array(
            'fsync'=>true,
            'justOne'=>false,
            'safe'=>true
    );
    protected function _setAdapter($database=''){
        if(!$database)
            throw new Zend_Exception('Mongodb The database name cannot be empty ');
        Hrs_Mongo_Config::selectDB($database);
    }
    public function __construct() {
        if(Hrs_Mongo_Config::$conn instanceof Mongo){
            $name = $this->_name;
            $defDb = Hrs_Mongo_Config::$defaultDb;
            $this->_db = $defDb->$name;
        }else{
            throw new Zend_Exception('Mongodb Server connection failed ');
        }
    }
    public function insert($data){
        if(!$this->testLink()) return false;
        $ret = $this->_db->insert($data, $this->c_options);
        return $ret;
    }
    public function update($data, $where){
        if(!$this->testLink()) return false;
        return $this->_db->update($where, $data, $this->u_options);
    }
    public function find($where=array(),$limit=0){
        if($this->testLink()) {
            if($limit>0){
                $this->_data = $where ? $this->_db->find($where)->limit($limit)->snapshot() : $this->_db->find()->limit($limit)->snapshot();
            }else{
                $this->_data = $where ? $this->_db->find($where)->limit($limit)->snapshot() : $this->_db->find()->limit($limit)->snapshot();
            }
        }
        return $this;
    }
    //find cursor
    /*
     *  Get the cursor object 
     */
    public function look($where=array(),$fields=array()){
        if($this->testLink()) {
            if($fields){
                return $where ? $this->_db->find($where,$fields): $this->_db->find()->fields($fields);
            }else{
                return $where ? $this->_db->find($where) : $this->_db->find();
            }
        }
        return false;
    }
    public function delete($where){
        if(!$this->testLink()) return false;
        return $this->_db->remove($where, $this->d_options);
    }
    public function dropMe(){
        if(!$this->testLink()) return false;
        return $this->_db->drop();
    }
    public function __toString(){
        return $this->_data;
    }
    public function toArray(){
        $tmpData = array();
        foreach($this->_data as $id=>$row){
            $one_row = array();
            foreach($row as $key=>$col){
                $one_row[$key] = $col;
            }
            $one_row['_id'] = $id;
            $tmpData[] = $one_row;
        }
        return $tmpData;
    }
    protected function testLink(){
        return Hrs_Mongo_Config::$linkStatus == 'success' ? true :false;
    }
}

Pay attention!!
The first method

    //find cursor
    /*
     *  Get the cursor object 
     */
    public function look($where=array(),$fields=array()){
        if($this->testLink()) {
            if($fields){
                return $where ? $this->_db->find($where,$fields): $this->_db->find()->fields($fields);
            }else{
                return $where ? $this->_db->find($where) : $this->_db->find();
            }
        }
        return false;
    }

The second method

    public function find($where=array(),$field=array()){
        if($this->testLink()) {
            $this->_data = $this->_db->find($where,$field)->sort(array("_id" => -1));
        }
        return $this;
    }

    /*
     *  Get the cursor object 
     */
    public function getCursor(){
     return $this->_data;
    }

The second is that find is not going to get an array
find($where)- > getCursor (); Is MongoCursor Object

Pay attention to the notice
find() returns the current object
The toArray() method converts the current object to an array
The getCursor() method converts the current object to MongoCursor Object (cursor object)