java dto id auto generated code example
Example: without increment mvc spring
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.FindAndModifyOptions;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.stereotype.Service;
import sample.data.mongo.models.IdGenerator;
import sample.data.mongo.repository.IdGeneratorRepository;
@Service
public class IdGeneratorService {
@Autowired
private IdGeneratorRepository idGeneratorRepository;
@Autowired
private MongoTemplate mongoTemplate;
public long generateId(String key) {
Query query = new Query();
Criteria criteria = new Criteria("identifier").is(key);
query.addCriteria(criteria);
Update update = new Update();
update.inc("counter", 1);
FindAndModifyOptions options = new FindAndModifyOptions();
options.upsert(true);
options.returnNew(true);
IdGenerator idGenerator = mongoTemplate
.findAndModify(query, update, options, IdGenerator.class);
return idGenerator.getCounter();
}
}