php中的mongodbselect常用操作代码示例，mongodbselect_PHP教程

php中的mongodb select常用操作代码示例，mongodbselect

前面说到了mongodb安装，配置，集群，以及php的插入与更新等，请参考：mongodb。
下面说一下，mongodb select的常用操作

测试数据：
代码如下:
{ "_id" : 1, "title" : "红楼梦", "auther" : "曹雪芹", "typeColumn" : "test", "money" : 80, "code" : 10 }
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }

1、取表条数
代码如下:
> db.books.count();
4

> db.books.find().count();
4

> db.books.count({auther: "李白" });
2

> db.books.find({money:{$gt:40,$lte:60}}).count();
1

> db.books.count({money:{$gt:40,$lte:60}});
1

php代码如下，按顺序对应的：
代码如下:
$collection->count(); //结果：4
$collection->find()->count(); //结果：4
$collection->count(array("auther"=>"李白")); //结果：2
$collection->find(array("money"=>array('$gt'=>40,'$lte'=>60)))->count(); //结果：1
$collection->count(array("money"=>array('$gt'=>40,'$lte'=>60))); //结果：1

提示：$gt为大于、$gte为大于等于、$lt为小于、$lte为小于等于、$ne为不等于、$exists不存在、$in指定范围、$nin指定不在某范围

2、取单条数据

代码如下:
> db.books.findOne();
{
"_id" : 1,
"title" : "红楼梦",
"auther" : "曹雪芹",
"typeColumn" : "test",
"money" : 80,
"code" : 10
}

> db.books.findOne({auther: "李白" });
{
"_id" : 3,
"title" : "朝发白帝城",
"auther" : "李白",
"typeColumn" : "test",
"money" : 30,
"code" : 30
}

php代码如下，按顺序对应的
代码如下:
$collection->findOne();
$collection->findOne(array("auther"=>"李白"));

3、find snapshot 游标

代码如下:
> db.books.find( { $query: {auther: "李白" }, $snapshot: true } );
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }

php代码如下：
代码如下:
/**
* 注意:
* 在我们做了find()操作，获得 $result 游标之后，这个游标还是动态的.
* 换句话说,在我find()之后,到我的游标循环完成这段时间,如果再有符合条件的记录被插入到collection,那么这些记录也会被$result 获得.
*/
$result = $collection->find(array("auther"=>"李白"))->snapshot();
foreach ($result as $id => $value) {
var_dump($value);
}

4、自定义列显示

代码如下:
> db.books.find({},{"money":0,"auther":0}); //money和auther不显示
{ "_id" : 1, "title" : "红楼梦", "typeColumn" : "test", "code" : 10 }
{ "_id" : 2, "title" : "围城", "typeColumn" : "test", "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "typeColumn" : "test", "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "code" : 40 }

> db.books.find({},{"title":1}); //只显示title列
{ "_id" : 1, "title" : "红楼梦" }
{ "_id" : 2, "title" : "围城" }
{ "_id" : 3, "title" : "朝发白帝城" }
{ "_id" : 4, "title" : "将近酒" }

/**
*money在60到100之间，typecolumn和money二列必须存在
*/
> db.books.find({money:{$gt:60,$lte:100}},{"typeColumn":1,"money":1});
{ "_id" : 1, "typeColumn" : "test", "money" : 80 }
{ "_id" : 4, "money" : 90 }

php代码如下，按顺序对应的：

代码如下:
$result = $collection->find()->fields(array("auther"=>false,"money"=>false)); //不显示auther和money列

$result = $collection->find()->fields(array("title"=>true)); //只显示title列

/**
*money在60到100之间，typecolumn和money二列必须存在
*/
$where=array('typeColumn'=>array('$exists'=>true),'money'=>array('$exists'=>true,'$gte'=>60,'$lte'=>100));
$result = $collection->find($where);

5、分页

代码如下:
> db.books.find().skip(1).limit(1); //跳过第条，取一条
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }

这根mysql，limit,offset有点类似，php代码如下：
代码如下:
$result = $collection->find()->limit(1)->skip(1);//跳过 1 条记录，取出 1条

6、排序

代码如下:
> db.books.find().sort({money:1,code:-1}); //1表示降序 -1表示升序,参数的先后影响排序顺序
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 1, "title" : "红楼梦", "auther" : "曹雪芹", "typeColumn" : "test", "money" : 80, "code" : 10 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }

php代码如下：
代码如下:
$result = $collection->find()->sort(array('code'=>1,'money'=>-1));

7、模糊查询

代码如下:
> db.books.find({"title":/城/}); //like '%str%' 糊查询集合中的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }

> db.books.find({"auther":/^李/}); //like 'str%' 糊查询集合中的数据
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }

> db.books.find({"auther":/书$/}); //like '%str' 糊查询集合中的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }

> db.books.find( { "title": { $regex: '城', $options: 'i' } } ); //like '%str%' 糊查询集合中的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }

php代码如下，按顺序对应的：

代码如下:
$param = array("title" => new MongoRegex('/城/'));
$result = $collection->find($param);

$param = array("auther" => new MongoRegex('/^李/'));
$result = $collection->find($param);

$param = array("auther" => new MongoRegex('/书$/'));
$result = $collection->find($param);

8、$in和$nin

代码如下:
> db.books.find( { money: { $in: [ 20,30,90] } } ); //查找money等于20，30，90的数据
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }

> db.books.find( { auther: { $in: [ /^李/,/^钱/ ] } } ); //查找以李，钱开头的数据
{ "_id" : 2, "title" : "围城", "auther" : "钱钟书", "typeColumn" : "test", "money" : 56, "code" : 20 }
{ "_id" : 3, "title" : "朝发白帝城", "auther" : "李白", "typeColumn" : "test", "money" : 30, "code" : 30 }
{ "_id" : 4, "title" : "将近酒", "auther" : "李白", "money" : 90, "code" : 40 }

php代码如下，按顺序对应的：

代码如下:
$param = array("money" => array('$in'=>array(20,30,90)));
$result = $collection->find($param);
foreach ($result as $id=>$value) {
var_dump($value);
}

$param = array("auther" => array('$in'=>array(new MongoRegex('/^李/'),new MongoRegex('/^钱/'))));
$result = $collection->find($param);
foreach ($result as $id=>$value) {
var_dump($value);
}

9、$or

代码如下:
> db.books.find( { $or: [ { money: 20 }, { money: 80 } ] } ); //查找money等于20，80的数据
{ "_id" : 1, "title" : "红楼梦", "auther" : "曹雪芹", "typeColumn" : "test", "money" : 80, "code" : 10 }

php代码如下：
代码如下:
$param = array('$or'=>array(array("money"=>20),array("money"=>80)));
$result = $collection->find($param);
foreach ($result as $id=>$value) {
var_dump($value);
}

10、distinct

代码如下:
> db.books.distinct( 'auther' );
[ "曹雪芹", "钱钟书", "李白" ]

> db.books.distinct( 'auther' , { money: { $gt: 60 } });
[ "曹雪芹", "李白" ]

php代码如下：

代码如下:
$result = $curDB->command(array("distinct" => "books", "key" => "auther"));
foreach ($result as $id=>$value) {
var_dump($value);
}

$where = array("money" => array('$gte' => 60));
$result = $curDB->command(array("distinct" => "books", "key" => "auther", "query" => $where));
foreach ($result as $id=>$value) {
var_dump($value);
}

先写到这儿，上面只是SELECT的一些常用操作，接下来，还会写一点。

据我所知，目前mongoDB没有“或”这个东西

但我刚才在网上查了下
发现了下面的信息，你参考下吧

在mongodb中有$or 操作符的，官网中给出的例子如下：

Simple:

db.foo.find( { $or : [ { a : 1 } , { b : 2 } ] } )

With another field

db.foo.find( { name : "bob" , $or : [ { a : 1 } , { b : 2 } ] } )

The $or operator retrieves matches for each or clause individually and eliminates duplicates when returning results. A number of $or optimizations are planned for 1.8. See this thread for details.
$or cannot be nested.
 

PHP中怎实现一个select语句读出多个表的内容

复合查询？例如。详细的意思不用我解说了吧
$sql="select * from p_newsbase as a, p_newscontent as b where a.id=b.nid and a.id='$_GET[id]'"
 

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