public interface CustomRepository extends MongoRepository<PracticeQuestion, String> { @Query(value = "{ 'userId' : ?0, 'questions.questionID' : ?1 }", fields = "{ 'questions.questionID' : 1 }") List<PracticeQuestion> findByUserIdAndQuestionsQuestionID(int userId, int questionID); } 使...
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find with an empty query (no arguments) returns documents one-by-one but that's not what we want! We want to perform queries so that we can answer interesting questions about our data. This is where filter documents will prove useful. Selecting based on a condition in MongoDB Let’s sta...
publicstaticvoidmain(String[]args)throwsIOException{MongoClientmongoClient=newMongoClient("localhost",27017);DBdb=mongoClient.getDB("mydb");DBCollectioncoll=db.getCollection("questionsCollection");mongoClient.setWriteConcern(WriteConcern.JOURNALED);GIFTParserp=newGIFTParser();BasicDBObjectdoc=null;for(Q...
Frequently Asked Questions: MongoDB是什么类型的数据库? MongoDB数据库有表吗? MongoDB数据库有模式吗? What languages can I use to work with the MongoDB? Does MongoDB support SQL? What are typical uses for MongoDB? Does MongoDB support transactions? Does MongoDB require a lot of RAM? How ...
MongoDB is a fastNoSQL database. Unfortunately, it’s not a cure for all your performance woes, and a single complex query can bring your code grinding to a halt. I recently suffered this fate, and it can be difficult to know where to look when your application suddenly becomes unstable...