mongoTable类文件获取MongoCursor(游标)的实现方法分析_php技巧

MongoCursor Object
游标类

Mongo
Config.php配置文件
Table.php（mongodb操作数据库类文件）

Config.php配置文件
代码如下:
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数据库名称不正确');
}
}else{
throw new Zend_Exception('Mongodb数据库名称不能为空');
}
}
}

Table.php（mongodb操作数据库类文件）
代码如下:
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(!$database)
throw new Zend_Exception('Mongodb数据库名称不能为空');
Hrs_Mongo_Config::selectDB($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服务器连接失败');
}
}
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 $this;
}
//find cursor
/*
* 获取游标对象
*/
public function look($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;
}
}

要点注意！！！
第一种方法
代码如下:
//find cursor
/*
* 获取游标对象
*/
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;
}

第二种方法
代码如下:
public function find($where=array(),$field=array()){
if($this->testLink()) {
$this->_data = $this->_db->find($where,$field)->sort(array("_id" => -1));
}
return $this;
}

代码如下:
/*
* 获取游标对象
*/
public function getCursor(){
return $this->_data;
}

第二种需要的是find得到的不是数组
find($where)->getCursor();是MongoCursor Object

注意注意
find()返回的是当前对象
toArray()方法是把当前对象转换为数组
getCursor()方法是把当前对象转换为MongoCursor Object（游标对象）