書き込みMongoDBは、私はMongoDBのクエリ以下のJavaコードを生成したい

Question

Javaコードでクエリを見つける：

db.getCollection('dum_stats').find({ "engineNo": {$eq: 1} },{"sensorName": 1, "_id": false}) 

ソリューション：

Bson query = Filters.eq("engineNo", Integer.parseInt(machineId)); 
FindIterable<Document> listOfSensorNames = dbCollection.find(query).projection(Projections.fields(Projections.include("sensorName"), Projections.exclude("_id"))); 

Answer 1

それは本当にあなたがmongoに接続するために使用するlibに依存します！私たちは少なくともこの数多くの図書館を持っています！ mongo Javaドライバと

1. Morphia. Type-Safe Wrapper with DAO/Datastore abstractions. 
2. Spring MongoDB. Provides Spring users with a familiar data access features including rich POJO mapping. 
3. Morphium. Feature-rich POJO Mapper including features like declarative caching, cluster awareness, validation, partial updates supports aggregation framework. 
4. Mungbean (w/clojure support). 
5. DataNucleus JPA/JDO. JPA/JDO wrapper 
6. lib-mongomapper. JavaBean Mapper (No annotations). 
7. MongoJack. Uses jackson (annotations) to map to/from POJOs and has a simple wrapper around DBCollection to simply this. 
8. Kundera. JPA compliant ORM. Works with multiple datastores. 
9. MongoFS. Enhanced file storage library with support for file compression, encryption, and Zip file expansion. Can be used on top of a GridFS-compatible bucket. 
9. Jongo. Query in Java as in mongo shell (using strings), unmarshall results into Java objects (using Jackson) 
10. MongoLink. Object Document Mapper (ODM.) Uses a plain java DSL for mapping declaration. 
11. Hibernate OGM. Provides Java Persistence support for MongoDB. 
12. Morphix. Lightweight, easy-to-use POJO mapper, with object caching and lifecycle methods. 

更新 リクエストコードは次のようになります。

db.getCollection("dum_stats").find(
    eq("engineNo", "1") 
).projection(
    fields(
     include("sensorName"), 
     excludeId("_id") 
    ) 
); 

Answer 2

このリンクを表示するJavaのためのすべての例： http://www.mkyong.com/mongodb/java-mongodb-hello-world-example/