Question

I have set up MongoDB following this tutorial

http://www.littlelostmanuals.com/2011/09/spring-mongodb-type-safe-queries.html

Everything works as expected but now I’m stuck at a point where I want to be able to query on multiple fields.

Currently I have repository interfaces for each type I’m saving and can search on a single field fine.

public interface StartedEventRepository extends 
    MongoRepository<DatablockStartedEvent, String>,
    QueryDslPredicateExecutor<DatablockStartedEvent> { 

}

Below is the query for a single parameter.

        return startedEventRepo
            .findOne(QDatablockStartedEvent.datablockStartedEvent.searchId
                    .eq(searchId));

Is it possible to create a Query object where I can say something similar to the following.

if(someName != null){
    query.where(QMyClass.name.eq(someName));
}
if(someTime != null){
    query.where(QMyClass.time.eq(someTime));
}

List result = query.list();

I’ve tried looking at the MongodbQuery but I couldn’t get it to work. Any ideas?

I saw an example http://www.mkyong.com/mongodb/spring-data-mongodb-update-document/ but this uses the mongoTemplate. Is there no way to achieve this through the repositories and if not, are they useless?

Answer 1

It should be possible. Something like this maybe

BooleanBuilder builder = new BooleanBuilder();

if(someName != null){
    builder.and(QMyClass.name.eq(someName));
}
if(someTime != null){
    builder.and(QMyClass.time.eq(someTime));
}

repository.findAll(builder.getValue())