php中的mongodb select常用操作代码示例

{ "_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 }

> 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 

$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 

> 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 
} 

$collection->findOne(); 
$collection->findOne(array("auther"=>"李白")); 

> 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 }

/
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); 
}

> 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 } 

$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); 

> 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 } 

$result = $collection->find()->limit(1)->skip(1);//跳过 1 条记录，取出 1条 

> 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 }

$result = $collection->find()->sort(array('code'=>1,'money'=>-1)); 

> db.books.find({"title":/城