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);