Spring Data MongoDB-聚合框架集成 [英] Spring data mongodb - aggregation framework integration

问题描述

我开始在应用程序中使用MongoDB数据库，并且为了进行数据访问，我选择了Spring Data for MongoDB.

I started to use MongoDB database in my application and for data access I have chosen Spring Data for MongoDB.

我浏览了API参考和文档，可以看到存在map-reduce集成，但是聚合框架又如何呢?我可以看到它支持分组操作，这表明它支持$group运算符: http://docs.mongodb.org/manual/reference/sql-aggregation-comparison/，但是其他运算符呢，现在不支持吗?

I skimmed API reference and documentation and I can see that there is map-reduce integration but what about aggregation framework? I can see that it supports group by operation, which would indicate that it supports $group operator judging from this: http://docs.mongodb.org/manual/reference/sql-aggregation-comparison/, but what about other operators, are that not supported for now?

我之所以问这个问题，是因为我想知道与MongoDB Sping Data提供的集成是什么，所以我知道可以期待什么.

I am asking this question because I wanted to know what kind of integration with MongoDB Sping Data provides so I know what to expect, so to speak.

推荐答案

Spring Data MongoOperations.group()方法映射到db.collection.group() MongoDB命令，而不是$group聚合函数.当前，Spring Data MongoDB中不支持聚合框架.您已经提到，虽然

The Spring Data MongoOperations.group() method is mapped to db.collection.group() MongoDB command and not the $group aggregation function. Currently there is no support in Spring Data MongoDB for aggregation framework. Map reduce, as you have mentioned, is supported though

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