Btukfyl

I have searched all over stackoverflow and other sites but i cannot figure out how to map tables that are returned from postgres functions with Hibernate in an Spring application.

I am not even sure if the return type table from postgres function can be matched with MyCustomTable somehow.

What i am trying to do is to call postgres functions (stored procedures) from spring app with hibernate.

i have this postgres function

CREATE OR REPLACE FUNCTION func99(type text,start_date TIMESTAMP, end_date TIMESTAMP) RETURNS TABLE(

    some_day TIMESTAMP,

    tot_requests BIGINT)

 AS $$

 BEGIN

   RETURN QUERY

   SELECT t1.first_date, COUNT(*) FROM table1 t1

   WHERE t1.request_type = type and t1.first_date > start_date and t1.first_date < end_date;

 END;

 $$ LANGUAGE PLpgSQL;

Controller

@GetMapping("/users/{username}/func99")

    public List<MyCustomTable> getResultsFromFunc99(@PathVariable(value = "username") String username,

                                                 @CurrentUser UserPrincipal currentUser,

                                                 @RequestParam(value = "service_type") String type,

                                                 @RequestParam(value = "start_date") Timestamp startDate,

                                                 @RequestParam(value = "end_date") Timestamp endDate){



        return queryService.getResultsFromFunc99(username, currentUser, type, startDate, endDate);

    }

Service

public List<MyCustomTable> getResultsFromFunc99(String username, UserPrincipal currentUser, String type, Timestamp startDate, Timestamp endDate) {



        User user = userRepository.findByUsername(username)

                .orElseThrow(() -> new ResourceNotFoundException("User", "username", username));





        return return incidentRepository.func99(type, startDate, endDate);

Repository

@Procedure(procedureName = "func99")

    List<MyCustomTable> func99(String type, Timestamp startDate, Timestamp endDate);

Entity

@Entity

@NamedStoredProcedureQuery(

        name = "func99",

        procedureName = "func99",

        parameters = {

                @StoredProcedureParameter(name = "type", mode = ParameterMode.IN, type = String.class),

                @StoredProcedureParameter(name = "start_date", mode = ParameterMode.IN, type = Timestamp.class),

                @StoredProcedureParameter(name = "end_date", mode = ParameterMode.IN, type = Timestamp.class)

        }

)

@Table(name = "table1")

public class MyCustomTable {...}

When a postgres function returns an integer i can make it work. What can i do to map table returns from postgres functions and how i integrate it with Hibernate?

Any help is much appreciated!
Thanks a lot!

This is a workaround I use for a similar problem, but it might work.

Define a SqlResultSetMapping like this:

@SqlResultSetMapping(

    name = "MyCustomTableMapping",

    entities = @EntityResult(entityClass = MyCustomTable.class)

)

Then change this parameter to your NamedStoredProcedureQuery annotation:

resultSetMappings = "MyCustomTableMapping"

I use this technique with NamedNativeQueries to make sure Hibernate doesn't track them for changes like actual entities. Saves me and my colleagues from having to remember to detach lots of entities. Just about every tutorial on how to use search results that don't correspond to a table will leave you with that problem and treat it as okay.

I found a working solution.

I don't use the method from repository.
Instead of the aforementioned repository:

*@Procedure(procedureName = "func99")

    List<MyCustomTable> func99(String type, Timestamp startDate, Timestamp endDate);*

I know do this inside service without using the repository:

@PersistenceContext

    EntityManager em;

.

public List<MyCustomTable> getResultsFromFunc99(String username, UserPrincipal currentUser, String type, Timestamp startDate, Timestamp endDate) {

    User user = userRepository.findByUsername(username)

            .orElseThrow(() -> new ResourceNotFoundException("User", "username", username));



 Query query = em.createNamedStoredProcedureQuery("func99");

        query.setParameter("some_day", someDay);

        ((StoredProcedureQuery) query).execute();



return query.getResultList()

Entity class remains the same where i declare

@Entity

@NamedStoredProcedureQuery(

        name = "func99",

        procedureName = "func99",

        parameters = {

                @StoredProcedureParameter(name = "type", mode = ParameterMode.IN, type = String.class),

                @StoredProcedureParameter(name = "start_date", mode = ParameterMode.IN, type = Timestamp.class),

                @StoredProcedureParameter(name = "end_date", mode = ParameterMode.IN, type = Timestamp.class)

        }

)

@Table(name = "table1")

public class MyCustomTable {...}