PHP实现的MongoDB数据库操作类分享

<div class="jb51code">
<pre class="brush:php;">
class HMongodb {

private $mongo; //Mongodb连接
private $curr_db_name;
private $curr_table_name;
private $error;

public function getInstance($mongo_server,$flag=array())
{
static $mongodb_arr;
if (empty($flag['tag']))
{
$flag['tag'] = 'default'; }
if (isset($flag['force']) && $flag['force'] == true)
{
$mongo = new HMongodb($mongo_server);
if (empty($mongodb_arr[$flag['tag']]))
{
$mongodb_arr[$flag['tag']] = $mongo;
}
return $mongo;
}
else if (isset($mongodb_arr[$flag['tag']]) && is_resource($mongodb_arr[$flag['tag']]))
{
return $mongodb_arr[$flag['tag']];
}
else
{
$mongo = new HMongodb($mongo_server);
$mongodb_arr[$flag['tag']] = $mongo;
return $mongo;
}
}

/**

• 构造函数
• 支持传入多个mongo_server(1.一个出问题时连接其它的server 2.自动将查询均匀分发到不同server)
• 参数：
• $mongo_server:数组或字符串-array("127.0.0.1:1111","127.0.0.1:2222")-"127.0.0.1:1111"
• $connect:初始化mongo对象时是否连接，默认连接
• $auto_balance:是否自动做负载均衡，默认是
• 返回值：
• 成功：mongo object
• 失败：false
  */
  private function __construct($mongo_server,$connect=true,$auto_balance=true)
  {
  if (is_array($mongo_server))
  {
  $mongo_server_num = count($mongo_server);
  if ($mongo_server_num > 1 && $auto_balance)
  {
  $prior_server_num = rand(1,$mongo_server_num);
  $rand_keys = array_rand($mongo_server,$mongo_server_num);
  $mongo_server_str = $mongo_server[$prior_server_num-1];
  foreach ($rand_keys as $key)
  {
  if ($key != $prior_server_num - 1)
  {
  $mongo_server_str .= ',' . $mongo_server[$key];
  }
  }
  }
  else
  {
  $mongo_server_str = implode(',',$mongo_server);
  } }
  else
  {
  $mongo_server_str = $mongo_server;
  }
  try {
  $this->mongo = new Mongo($mongo_server,array('connect'=>$connect));
  }
  catch (MongoConnectionException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  }

/**

• 连接mongodb server
• 参数：无
• 返回值：
• 成功：true
• 失败：false
  */
  public function connect()
  {
  try {
  $this->mongo->connect();
  return true;
  }
  catch (MongoConnectionException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  }

/**

• select db
• 参数：$dbname
• 返回值：无
  */
  public function selectDb($dbname)
  {
  $this->curr_db_name = $dbname;
  }

/**

• 创建索引：如索引已存在，则返回。
• 参数：
• $table_name:表名
• $index:索引-array("id"=>1)-在id字段建立升序索引
• $index_param:其它条件-是否唯一索引等
• 返回值：
• 成功：true
• 失败：false
  */
  public function ensureIndex($table_name,$index,$index_param=array())
  {
  $dbname = $this->curr_db_name;
  $index_param['safe'] = 1;
  try {
  $this->mongo->$dbname->$table_name->ensureIndex($index,$index_param);
  return true;
  }
  catch (MongoCursorException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  }

/**

• 插入记录
• 参数：
• $table_name:表名
• $record:记录
• 返回值：
• 成功：true
• 失败：false
  */
  public function insert($table_name,$record)
  {
  $dbname = $this->curr_db_name;
  try {
  $this->mongo->$dbname->$table_name->insert($record,array('safe'=>true));
  return true;
  }
  catch (MongoCursorException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  }

/**

• 查询表的记录数
• 参数：
• $table_name:表名
• 返回值：表的记录数
  */
  public function count($table_name)
  {
  $dbname = $this->curr_db_name;
  return $this->mongo->$dbname->$table_name->count();
  }

/**

• 更新记录
• 参数：
• $table_name:表名
• $condition:更新条件
• $newdata:新的数据记录
• $options:更新选择-upsert/multiple
• 返回值：
• 成功：true
• 失败：false
  */
  public function update($table_name,$condition,$newdata,$options=array())
  {
  $dbname = $this->curr_db_name;
  $options['safe'] = 1;
  if (!isset($options['multiple']))
  {
  $options['multiple'] = 0; }
  try {
  $this->mongo->$dbname->$table_name->update($condition,$options);
  return true;
  }
  catch (MongoCursorException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  }

/**

• 删除记录
• 参数：
• $table_name:表名
• $condition:删除条件
• $options:删除选择-justOne
• 返回值：
• 成功：true
• 失败：false
  */
  public function remove($table_name,$options=array())
  {
  $dbname = $this->curr_db_name;
  $options['safe'] = 1;
  try {
  $this->mongo->$dbname->$table_name->remove($condition,$options);
  return true;
  }
  catch (MongoCursorException $e)
  {
  $this->error = $e->getMessage();
  return false;
  } }

/**

• 查找记录
• 参数：
• $table_name:表名
• $query_condition:字段查找条件
• $result_condition:查询结果限制条件-limit/sort等
• $fields:获取字段
• 返回值：
• 成功：记录集
• 失败：false
  */
  public function find($table_name,$query_condition,$result_condition=array(),$fields=array())
  {
  $dbname = $this->curr_db_name;
  $cursor = $this->mongo->$dbname->$table_name->find($query_condition,$fields);
  if (!empty($result_condition['start']))
  {
  $cursor->skip($result_condition['start']);
  }
  if (!empty($result_condition['limit']))
  {
  $cursor->limit($result_condition['limit']);
  }
  if (!empty($result_condition['sort']))
  {
  $cursor->sort($result_condition['sort']);
  }
  $result = array();
  try {
  while ($cursor->hasNext())
  {
  $result[] = $cursor->getNext();
  }
  }
  catch (MongoConnectionException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  catch (MongoCursorTimeoutException $e)
  {
  $this->error = $e->getMessage();
  return false;
  }
  return $result;
  }

/**

• 查找一条记录
• 参数：
• $table_name:表名
• $condition:查找条件
• $fields:获取字段
• 返回值：
• 成功：一条记录
• 失败：false
  */
  public function findOne($table_name,$fields=array())
  {
  $dbname = $this->curr_db_name;
  return $this->mongo->$dbname->$table_name->findOne($condition,$fields);
  }

/**

• 获取当前错误信息
• 参数：无
• 返回值：当前错误信息
  */
  public function getError()
  {
  return $this->error;
  }

/* Mongodb类 examples:

• $mongo = new HMongodb("127.0.0.1:11223");
• $mongo->selectDb("test_db");
• 创建索引
• $mongo->ensureIndex("test_table",array("id"=>1),array('unique'=>true));
• 获取表的记录
• $mongo->count("test_table");
• 插入记录
• $mongo->insert("test_table",array("id"=>2,"title"=>"asdqw"));
• 更新记录
• $mongo->update("test_table",array("id"=>1,"title"=>"bbb"));
• 更新记录-存在时更新，不存在时添加-相当于set
• $mongo->update("test_table","title"=>"bbb"),array("upsert"=>1));
• 查找记录
• $mongo->find("c",array("title"=>"asdqw"),array("start"=>2,"limit"=>2,"sort"=>array("id"=>1)))
• 查找一条记录
• $mongo->findOne("$mongo->findOne("ttt",array("id"=>1))",array("id"=>1));
• 删除记录
• $mongo->remove("ttt",array("title"=>"bbb"));
• 仅删除一条记录
• $mongo->remove("ttt",array("title"=>"bbb"),array("justOne"=>1));
• 获取Mongo操作的错误信息
• $mongo->getError();
  */

}