how to apply mongo db update operators as $inc in spring boot

Question

All I want to do is a simple query using spring boot and mongodb but I can't find resources online, update query to increment frequency field by one given searchString or create a new document if searchString is not found.

@Query("{'searchString': ?0 } , {'$inc' : {'frequency':1}} ")
public void incFreq(String query);

Answer 1

Hope you use spring-data-mongodb . Since you haven't mentioned about the Document class, I assume it as Person.class

First you @Autowire the MongoTemplate in the service implementation.

@Autowire
MongoTemplate mongoTemplate;

Then what you can do is, you can call a query like following,

public void incFreq(String given_str){
    Query query=new Query(Criteria.where("searchString ").is("given_str"));
    Person person=mongoTemplate.find(query,Person.class);

    if(person!=null){
        Update update=new Update().inc("frequency",1)
        UpdateResult result=mongoTemplate.updateOne(query,update,Person.class);
        // bu using the result, you can see modifiedCount(),matchCount()
    }else{
        // insert query
    }
}

If you going to use JPA methods, then

public void incFreq(String given_str){
    Optional<Person> p=personRepository.findBySearchString(String given_str);
    if(p.isPresent()){
        p.get().setFrequency(p.get().getFrequency()+1);
        personRepository.save(p);
    }else{
        Person p=new Person();
        p.setName("some name");
        p.setFrequency(1);
        personRepository.save(p);
    }
}

Refer Spring data mongodb

Answer 2

@Autowired
   MongoTemplete mongotemplate;

Update update = new Update();

    Query query = new Query();
    update.inc("listPrice",productItem.getListPrice());
mongoTemplate.updateMulti(query,update,ProductCatalogItem.class);

    

#"listPrice" : for which you wanna use $inc.
#productItem : instance of your class