example

import static org.springframework.data.mongodb.core.aggregation.Aggregation.*;
import static org.springframework.data.mongodb.core.aggregation.ConditionalOperators.Cond.*;
import org.springframework.data.mongodb.core.query.Criteria;

Cond condOperation = ConditionalOperators.when(Criteria.where("start").is("EARLY"))
                                    .thenValueOf("deltastart.start")
                                    .otherwise("deltastart.end");

Aggregation agg = newAggregation(project().and(condOperation).as("start"));
AggregationResults<MyClass> results = mongoTemplate.aggregate(agg, MyClass.class); 
List<MyClass> myList = results.getMappedResults();

全文畢

歡迎關注微信公眾號：Javall咖啡屋
每天更新各種互聯(lián)網(wǎng)技術（前后端、數(shù)據(jù)庫、中間件、設計模式、數(shù)據(jù)結構、算法）學習心得體會