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）

$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);