How to write dynamic native SQL Query in spring data JPA?

Question

I need to write a search query on multiple tables in database in spring boot web application.

It uses spring data jpa. I know we can write native query in spring da

Answer 1

You need to do a CustomRepository and add a method with native query.

I do that this way:

1. Create your custom repository:

   public interface OcorrenciaRepositoryCustom {
      List getStrings(List valores);
   }
   

2. Implement your custom repository: (The name of the implemantation must be the name of original repository add Impl as suffix.)

   public class OcorrenciaRepositoryImpl implements OcorrenciaRepositoryCustom {
       @PersistenceContext
       private EntityManager entityManager;
   
       @Override
       public List getStrings(List strings) {
           StringBuilder sb = new StringBuilder();
           sb.append("SELECT count(o.id) FROM soebm.ocorrencia o WHERE 1=1 ");
   
           if(strings.get(0)!=null && StringUtils.isNotEmpty(strings.get(0))) {
               sb.append(" AND to_char(o.date, 'YYYY-MM-DD') >= :dataInicio ");
           }
   
           Query query = entityManager.createNativeQuery(sb.toString());
   
           if(strings.get(0)!=null && StringUtils.isNotEmpty(strings.get(0).toString())) {
               query.setParameter("dataInicio", strings.get(0));
           }
           return query.getResultList();
       }
   }
   

3. Extend your custom repository from main repository:

   public interface OcorrenciaRepository extends JpaRepository, OcorrenciaRepositoryCustom {
       Ocorrencia findByPosto(Posto posto);
   }
   

4. Now, in the service, you can call your new method from the main repository.

   @Autowired
   private OcorrenciaRepository repository;
   
   public List findOcorrenciaCustom(String str) {
       List strings = new ArrayList() {{add(dataInicio);}};
       return repository.getStrings(strings);
   }
   

It is important that the custom repository is under the package searched by JpaRepositories

@EnableJpaRepositories("com.test.my.repository")

I used Spring-Data-Jpa 1.9 in this example. It worked perfectly in my project.