mongo-java-driver

mongoDB, redis 2017. 7. 23. 23:16

javadoc_REF (많이쓸 클래스: async.client.mongoCollection)

- 부속: async-driver

<최근 dependency>

'org.mongodb:mongo-java-driver:3.4.2'

'org.mongodb:mongodb-driver-async:3.4.2'

이중화: https://nextus.tistory.com/26

aggregate사용법: 기초 REF , 프로그래밍 중에 사용법 REF

aggretate상세설명: REF

Async Code예제:REF

JAVA (Spring에서 aggregation 사용예제)

Criteria criteria = new Criteria("producerNo").is(producerNo);

MatchOperation match = Aggregation.match(criteria);
SortOperation sort = Aggregation.sort(Sort.Direction.DESC, "deliverStart");
Aggregation agg  = Aggregation.newAggregation(match, sort);

AggregationResults<DeliverProduct> results  = mongoTemplate.aggregate(agg, "deliverProduct", DeliverProduct.class);
List<DeliverProduct> productList = results.getMappedResults();

group의 경우

  //SQL: db.xx.aggregate([{$group:{_id:{iotId:"$iotId", producerNo:"$producerNo"},
  //                                   deliverStart:{ $max:"$time"}}} ]

  //RUN "group" Aggregation.//max(deliverStart)->deliverStart로
  GroupOperation group = Aggregation.group("iotId", "producerNo").max("time").as("time"); 
  Aggregation agg  = Aggregation.newAggregation(group);