MongoDB PHP数据库查询类
<?php/*** 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),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", array("id"=>1),array("id"=>1,"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();
*/
class HMongodb {
//Mongodb连接
var $mongo;
var $curr_db_name;
var $curr_table_name;
var $error;
/**
* 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
* $auto_balance:是否自动做负载均衡，默认是
*
* 返回值：
* 成功：mongo object
* 失败：false
*/
function __construct($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 = $e->getMessage();
return false;
}
}
function getInstance($mongo_server, $flag=array())
{
static $mongodb_arr;
if (emptyempty($flag['tag']))
{
$flag['tag'] = 'default'; }
if (isset($flag['force']) && $flag['force'] == true)
{
$mongo = new HMongodb($mongo_server);
if (emptyempty($mongodb_arr[$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; } }
/**
* 连接mongodb server
*
* 参数：无
*
* 返回值：
* 成功：true
* 失败：false
*/
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
*/
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
* $index_param:其它条件-是否唯一索引等
*
* 返回值：
* 成功：true
* 失败：false
*/
function ensureIndex($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
* $record:记录
*
* 返回值：
* 成功：true
* 失败：false
*/
function insert($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：
* $table_name:表名
*
* 返回值：表的记录数
*/
function count($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
* $options:更新选择-upsert/multiple
*
* 返回值：
* 成功：true
* 失败：false
*/
function update($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, $newdata, $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
* $options:删除选择-justOne
*
* 返回值：
* 成功：true
* 失败：false
*/
function remove($table_name, $condition, $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
* $fields:获取字段
*
* 返回值：
* 成功：记录集
* 失败：false
*/
function find($table_name, $query_condition, $result_condition=array(), $fields=array())
{
$dbname = $this->curr_db_name;
$cursor = $this->mongo->$dbname->$table_name->find($query_condition, $fields);
if (!emptyempty($result_condition['start']))
{
$cursor->skip($result_condition['start']);
}
if (!emptyempty($result_condition['limit']))
{
$cursor->limit($result_condition['limit']);
}
if (!emptyempty($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
* $fields:获取字段
*
* 返回值：
* 成功：一条记录
* 失败：false
*/
function findOne($table_name, $condition, $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
*/
function getError()
{
return $this->error;
}
}
?>
数据库连接
//⑴默认格式
$m = new Mongo();
//这里采用默认连接本机的27017端口，当然你也可以连接远程主机如192.168.0.4:27017,如果端口是27017，端口可以省略
//⑵标准连接
$m = new Mongo("mongodb://${username}:${password}@localhost");
选择想要的collection:
$mo = new Mongo();
$coll = $mo->selectCollection('db', 'mycoll');//得到一个collection对象
插入数据（MongoCollection对象）
$coll = $mo->db->foo;
$a = array('a' => 'b');
$options = array('safe' => true);
$rs = $coll->insert($a, $options);
更新数据库中的记录（MongoCollection对象）
$coll = $mo->db->coll;
$c = array('a' => 1, 's' => array('$lt' => 100));
$newobj = array('e' => 'f', 'x' => 'y');
$options = array('safe' => true, 'multiple' => true);
$rs = $coll->update($c, $newobj, $options);
删除数据库中的记录（MongoCollection对象）
$coll = $mo->db->coll;
$c = array('a' => 1, 's' => array('$lt' => 100));
$options = array('safe' => true);
$rs = $coll->remove($c, $options);
查询collection获得多条记录（MongoCollection类）
$coll = $mo->db->coll;
$query = array('s' => array('$lt' => 100));
$fields = array('a' => true, 'b' => true);
$rs = $coll->find($query, $fields);
查询collection获得单条记录（MongoCollection类）
$coll = $mo->db->coll;
$query = array('s' => array('$lt' => 100));
$fields = array('a' => true, 'b' => true);
$rs = $coll->findOne($query, $fields);
针对游标对象MongoCursor的操作(MongoCursor类)：
$cursor = $coll->find($query,$fields);
while($cursor->hasNext()){
$r = $cursor->getNext();
var_dump($r);
}
//或者
$cursor = $coll->find($query,$fields);
foreache($cursor as $k=>$v){
var_dump($v);
}
//或者
$cursor = $coll->find($query,$fields);
$array= iterator_to_array($cursor);
删除一个数据库
$m -> dropDB("comedy");
删除当前DB
$db = $mo->dbname;
$db->drop();
列出所有可用数据库
$m->listDBs(); //无返回值
获得当前数据库名
$db = $mo->dbname;
$db->_tostring();
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