php实现的mongodb操作类

<?php /** * Created by PhpStorm. * User: yangyulong * Date: 2015/5/26 * Time: 13:45 */class Mongo_db{  private static $instanceof = NULL;  public $mongo;  private $host = 'localhost';  private $port = '27017';   private $db;  public $dbname;  private $table = NULL;   /**   * 初始化类，得到mongo的实例对象   */  public function __construct($host = NULL, $port = NULL, $dbname = NULL, $table = NULL)  {     if (NULL === $dbname) {      $this->throwError('集合不能为空！');    }     //判断是否传递了host和port    if (NULL !== $host) {      $this->host = $host;    }     if (NULL !== $port) {      $this->port = $port;    }     $this->table = $table;     $this->mongo = new MongoClient($this->host . ':' . $this->port);    if ($this->getVersion() >= '0.9.0') {      $this->dbname = $this->mongo->selectDB($dbname);      $this->db = $this->dbname->selectCollection($table);    } else {      $this->db = $this->mongo->$dbname->$table;    }  }   public function getVersion()  {    return MongoClient::VERSION;  }   /**   * 单例模式   * @return Mongo|null   */  //public static function getInstance($host=null, $port=null, $dbname=null, $table=null){  //  //  if(!(self::$instanceof instanceof self)){  //    self::$instanceof = new self($host, $port, $dbname, $table);  //  }  //  //  return self::$instanceof;  //}   /**   * 插入一条数据   * @param array $doc   */  public function insert($doc = array())  {    if (empty($doc)) {      $this->throwError('插入的数据不能为空！');    }    //保存数据信息    try {      if (!$this->db->insert($doc)) {        throw new MongoException('插入数据失败');      }    } catch (MongoException $e) {      $this->throwError($e->getMessage());    }  }   /**   * 插入多条数据信息   * @param array $doc   */  public function insertMulti($doc = array())  {    if (empty($doc)) {      $this->throwError('插入的数据不能为空！');    }    //插入数据信息    foreach ($doc as $key => $val) {      //判断$val是不是数组      if (is_array($val)) {        $this->insert($val);      }    }  }   /**   * 查找一条记录   * @return array|null   */  public function findOne($where = NULL)  {    if (NULL === $where) {      try {        if ($result = $this->db->findOne()) {          return $result;        } else {          throw new MongoException('查找数据失败');        }      } catch (MongoException $e) {        $this->throwError($e->getMessage());      }    } else {      try {        if ($result = $this->db->findOne($where)) {          return $result;        } else {          throw new MongoException('查找数据失败');        }      } catch (MongoException $e) {        $this->throwError($e->getMessage());      }    }   }   /**   * todo 带条件的随后做   * 查找所有的文档   * @return MongoCursor   */  public function find($where = NULL)  {    if (NULL === $where) {       try {        if ($result = $this->db->find()) {         } else {          throw new MongoException('查找数据失败');        }      } catch (MongoException $e) {        $this->throwError($e->getMessage());      }    } else {      try {        if ($result = $this->db->find($where)) {         } else {          throw new MongoException('查找数据失败');        }      } catch (MongoException $e) {        $this->throwError($e->getMessage());      }    }     $arr = array();    foreach ($result as $id => $val) {      $arr[] = $val;    }     return $arr;  }   /**   * 获取记录条数   * @return int   */  public function getCount()  {    try {      if ($count = $this->db->count()) {        return $count;      } else {        throw new MongoException('查找总数失败');      }    } catch (MongoException $e) {      $this->throwError($e->getMessage());    }  }   /**   * 获取所有的数据库   * @return array   */  public function getDbs()  {    return $this->mongo->listDBs();  }   /**   * 删除数据库   * @param null $dbname   * @return mixed   */  public function dropDb($dbname = NULL)  {    if (NULL !== $dbname) {      $retult = $this->mongo->dropDB($dbname);      if ($retult['ok']) {        return TRUE;      } else {        return FALSE;      }    }    $this->throwError('请输入要删除的数据库名称');  }   /**   * 强制关闭数据库的链接   */  public function closeDb()  {    $this->mongo->close(TRUE);  }   /**   * 输出错误信息   * @param $errorInfo 错误内容   */  public function throwError($errorInfo='')  {    echo "<h3>出错了：$errorInfo</h3>";    die();  } }