MongoDB的文档分组

Question

我有我的测试集下面给出..

> db.test.find() 
{ "_id" : "111-21212121", "Mawb" : "111-1111111", "Hawb" : "111111", "Hawb_date" : "date1" } 
{ "_id" : "111-21212122", "Mawb" : "111-1111111", "Hawb" : "222222", "Hawb_date" : "date1" } 
{ "_id" : "111-21212123", "Mawb" : "222-2222222", "Hawb" : "333333", "Hawb_date" : "date1" } 
{ "_id" : "111-21212124", "Mawb" : "222-2222222", "Hawb" : "444444", "Hawb_date" : "date1" } 
{ "_id" : "111-21212125", "Mawb" : "333-3333333", "Hawb" : "555555", "Hawb_date" : "date1" } 
{ "_id" : "111-21212126", "Mawb" : "333-3333333", "Hawb" : "666666", "Hawb_date" : "date1" } 

，我想组（图/联合收割机）它分组文件like，

[ 
{ "_id" : "111-21212121", "Mawb" : "111-1111111", "Hawb" : "111111", "Hawb_date" : "date1" } 
{ "_id" : "111-21212122", "Mawb" : "111-1111111", "Hawb" : "222222", "Hawb_date" : "date1" }], 
[{ "_id" : "111-21212123", "Mawb" : "222-2222222", "Hawb" : "333333", "Hawb_date" : "date1" } 
{ "_id" : "111-21212124", "Mawb" : "222-2222222", "Hawb" : "444444", "Hawb_date" : "date1" }], 
[{ "_id" : "111-21212125", "Mawb" : "333-3333333", "Hawb" : "555555", "Hawb_date" : "date1" } 
{ "_id" : "111-21212126", "Mawb" : "333-3333333", "Hawb" : "666666", "Hawb_date" : "date1" }] 

我试过地图缩小但无法通过。我该怎么做？

Answer 1

如果您使用的是MongoDB 2.1或更高版本（2.1.x是2.2.0稳定版本即将推出的开发系列），您可以使用聚合框架在服务器端完成所有这些工作。

http://www.mongodb.org/display/DOCS/Aggregation+Framework