Mongo查询分组

 

 

db.test.aggregate(
    {\'$match\':{"url":/http:\/\/www.baidu.cn\/member\/T107581\//}},
    {\'$group\':{\'_id\':\'$ip\',\'count\':{\'$sum\':1}}},
    {\'$skip\':100},
    {\'$out\':\'201702\'}    
    )

 如果需要查看返回分组的数量时，可以用一个变量去接收，然后打印长度。

var rel= db.hyyy.aggregate(
    {\'$match\':{"_id":{$gt:ObjectId("560c07000000000000000000"),$lt:ObjectId("5634e5800000000000000000")}}},
    {\'$group\':{\'_id\':\'$ip\',\'count\':{\'$sum\':1}}}    
    //,{\'$limit\':10000}
    //,{\'$skip\':4000}
    //,{\'$out\':\'201702\'}    
    )
    print(rel.toArray().length);