Mognodb数据库连接.

默认格式

$m = new Mongo();//这里采用默认连接本机的27017端口，当然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。

标准连接

$m = new Mongo("mongodb://${username}:${password}@localhost");

实例：

$m = new Mongo("mongodb://127.0.0.1:27017/admin:admin");

数据库的用户名和密码都是admin

数据库操作

插入数据

<?php//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$m = new Mongo("mongodb://127.0.0.1:27017/admin:admin");//选择comedy数据库，如果以前没该数据库会自动创建，也可以用$m->selectDB("comedy");$db = $m->comedy;//选择comedy里面的collection集合，相当于RDBMS里面的表，也可以使用$collection = $db->collection;$db->selectCollection("collection");/*********添加一个元素**************/$obj = array("title" => "php1", "author" => "Bill Watterson");//将$obj 添加到$collection 集合中$collection->insert($obj);/*********添加另一个元素**************/$obj = array("title" => "huaibei", "online" => true);$collection->insert($obj);//$query = array("title" => "huaibei");$query = array( "_id" => $obj['_id'] );$cursor = $collection->find($query);//遍历所有集合中的文档foreach ($cursor as $obj) { echo $obj["title"] . "\n"; echo $obj["_id"] . "\n";}//断开MongoDB连接$m->close();

带条件的查询

mysql: id = 123mongo: array(‘id’=>123)mysql: name link ’%bar%’mongo: array(‘name’ => new MongoRegex(‘/.*bar.*/i’))mysql: where id > 10mongo: array(‘id’ => array(‘$gt’ => 10))mysql: where id >= 10mongo: array(‘id’ => array(‘$gte’ => 10))mysql: where id < 10mongo: array(‘id’ => array(‘$lt’ => 10))mysql: where id <= 10mongo: array(‘id’ => array(‘$lte’ => 10))mysql: where id > 1 and id < 10mongo: array(‘id’ => array(‘$gt’ => 1,’$lt’ => 10))mysql: where id <> 10mongo: array(‘id’ => array(‘$ne’ => 10))mysql: where id in(123)mongo: array(‘id’ => array(‘$in’ => array(1,2,3)))mysql: where id not in(123)mongo: array(‘id’ => array(‘$nin’ => array(1,2,3)))mysql: where id = 2 or id = 9mongo: array(‘id’ => array(‘$or’ => array(array(‘id’=>2),array(‘id’=>9))))mysql: order by name ascmongo: array(‘sort’=>array(‘name’=>1))mysql: order by name descmongo: array(‘sort’=>array(‘name’=>-1))mysql: limit 0,2mongo: array(‘limit’=>array(‘offset’=>0,’rows’=>2))mysql: select name,emailmongo: array(‘name’,'email’)mysql: select count(name)mongo: array(‘COUNT’) //注意：COUNT为大写

查询时，每个Object插入时都会自动生成一个独特的_id,它相当于RDBMS中的主键，用于查询时非常方便 （_id每一都不同，很像自动增加的id）

<?php$param = array("name" => "joe");$collection->insert($param);$joe = $collection->findOne(array("_id" => $param['_id']));print_R($joe);$m->close();

返回结果：Array ( [_id] => MongoId Object ( [$id] => 4fd30e21870da83416000002 ) [name] => joe )

更改字段值

<?php$sign = array("title" => 'php1');$param = array("title" => 'php1','author'=>'test');$joe = $collection->update($sign, $param);

删除一个数据库

$m -> dropDB(“comedy”);

列出所有可用数据库

$m->listDBs(); //无返回值

创建一个MongoDB对象

<?php$mo = new Mongo();$db = new MongoDB($mo,’dbname’);//通过创建方式获得一个MongoDB对象

删除当前DB

<?php$db = $mo->dbname;$db->drop();

获得当前数据库名

<?php$db = $mo->dbname;$db->_tostring();

选择想要的collection:

//A:$mo = new Mongo();$coll = $mo->dbname->collname;//获得一个collection对象//B：$db = $mo->selectDB(’dbname’);$coll = $db->collname;//C:$db = $mo->dbname;$coll = $db->collname;//D:$db = $mo->dbname;$coll = $db->selectCollectoin(’collname’);//获得一个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);

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);

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 = $coll->remove($c,$newobj,$options);

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);

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);$cursor = $coll->find($query,$fields);//排序$cursor->sort(array(‘字段’=>-1));(-1倒序，1正序)//跳过部分记录$cursor->skip(100);跳过100行//只显示部分记录$cursor->limit(100);只显示100行返回一个游标记录对象MongoCursor。

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);