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();
  }
 
}