mongodb和php的用法详解

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 = 123 mongo: array(‘id'=>123) mysql: name link '%bar%' mongo: array(‘name' => new MongoRegex(‘/.*bar.*/i')) mysql: where id > 10 mongo: array(‘id' => array(‘$gt' => 10)) mysql: where id >= 10 mongo: array(‘id' => array(‘$gte' => 10)) mysql: where id < 10 mongo: array(‘id' => array(‘$lt' => 10)) mysql: where id <= 10 mongo: array(‘id' => array(‘$lte' => 10)) mysql: where id > 1 and id < 10 mongo: array(‘id' => array(‘$gt' => 1,'$lt' => 10)) mysql: where id <> 10 mongo: 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(‘$nin' => array(1,2,3))) mysql: where id = 2 or id = 9 mongo: array(‘id' => array(‘$or' => array(array(‘id'=>2),array(‘id'=>9)))) mysql: order by name asc mongo: array(‘sort'=>array(‘name'=>1)) mysql: order by name desc mongo: array(‘sort'=>array(‘name'=>-1)) mysql: limit 0,2 mongo: array(‘limit'=>array(‘offset'=>0,'rows'=>2)) mysql: select name,email mongo: 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）