PHP编程：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)) {
      $this->throwError('插入的数据不能为空!');
    }
    //保留数据信息
    try {
      if (!$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();
  }
 
}