How to return a select query from jpa repository with foreign key type

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I am trying to do this:

@Query(value = "SELECT DISTINCT c.* FROM comarca c INNER JOIN debito_negativacao d ON d.comarca_id = c.id WHERE d.status = :status", nativeQuery = true)
List<Comarca> findDistinctComarcaByStatus(@Param("status") String status);

But I get this error:

  org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.Object[]] to type [com.hc.projects.model.Comarca] for value '{9, 0, 7323}'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.math.BigInteger] to type [com.hc.projects.model.Comarca]

If, in a second time, you want to isolate a list of comarca_id, try to stream your request result.

    List<Comarca> comarca = debitoNegativacao.stream().map(dn -> dn.getComarca()).distinct().collect(Collectors.toList());

++

How to return a select query from jpa repository with foreign key type, How to return a select query from jpa repository with foreign key type. I am try to do this: I am try to do this: @Query(value = "SELECT DISTINCT comarca_id  How to return a select query from jpa repository with foreign key type I am try to do this: @Query(value = "SELECT DISTINCT comarca_id FROM debito_negativacao WHERE debito_negativacao.status= :status", nativeQuery = true) List<Comarca> findDistinctComarcaIdByStatus(@Param("status") String status);


You have to return all columns that are necessary to construct a Comarca. So you will have to join the table.

As didn't provide the tables I can only guess:

@Query(value = "SELECT DISTINCT * FROM comarca c " +
                "JOIN debito_negativacao d ON d.comarca_id = c.id "+
                "WHERE d.debito_negativacao.status= :status", nativeQuery = true)
List<Comarca> findDistinctComarcaIdByStatus(@Param("status") String status);

Hibernate Tip: What's the Difference between JOIN, LEFT JOIN , The JOIN FETCH clause is specific to JPA. This mapping provides the names of the foreign key and primary key columns. Choose this if you have no experience with Hibernate and want to get started. Here's an example of a JPQL query that returns all Author entities who've written a Book which title contains the word  In this JPA native query example, we will learn to use JPA native query (SQL SELECT query) using createNativeQuery() method of the EntityManager interface. We will pass in the query string to be executed in underlying database and the entity type that will be returned as result. We will also use named sql native queries in this example.


Your request tells that you want a list of BigInteger : SELECT DISTINCT comarca_id... because comarca_id is a biginteger I guess. If you want a Comarca list, you have to request on all your table.

JPQL, Learn how to use all its features to build powerful queries with JPA and Hibernate​. The following code snippet shows a simple JPQL query in which I select all it in the WHERE clause to the records with matching foreign and primary keys. returns the remainder of a division; treat(x as Type): downcasts x to the given  The ability to retrieve managed entity objects is a major advantage of JPQL. For example, the following query returns Country objects that become managed by the EntityManager javax.persistence.EntityManager JPA interface Interface used to interact with the persistence context.


If you want to use a distinct query that will return other columns than the distinct one you need some kind of strategy how to "merge" the objects. Imagine rows like this:

------------------------------
| comarca_id| key | status    |
| 1         | A   | your_state|
| 1         | B   | your_state|
| 2         | C   | your_state|
------------------------------

What would you get in this case?

SELECT DISTINCT comarca_id FROM comarca; will return 1,2

However, how can you merge two (or more) entries which have the same comarca_idand status?

This leaves you with three cases:

  1. you assume comarca_id + status is unique -> you don't need the DISTINCT query
  2. There might be more than one row with same comarca_id and status -> you can't make the query distinct
  3. you only want the distinct comarca_id values -> make your method return List<BigInteger>

Hibernate ORM 5.2.18.Final User Guide, Mapping the entity to a SQL query; 2.5.9. Define a custom Configuring the SessionFactory Metadata via the JPA bootstrap. 4. Schema The SELECT clause; 15.39. Legacy return-property to explicitly specify column/alias names; 30.3. It is impossible to specify a foreign key constraint for this kind of association. This is  The Spring Boot JPA One to One Foreign Key Relationship Mapping Example shows you the process of mapping an one-to-one relationship using Spring JPA and Spring Boot. A OneToOne relationship in Java is where the source object has an attribute that references another target object and (if) that target object had the inverse relationship back to


HQL Select New doesn't return row when a foreign key is null, HQL Select New doesn't return row when a foreign key is null - spring. much I have a SELECT statemen that is returning certain columns of various data types. OrderTrackingRepository extends JpaRepository<Account, UUID> { #Query(  List results = query.getResultListgetResultList()Query's methodExecute a SELECT query and return the query results See JavaDoc Reference Page An attempt to cast the above resultsto a parameterized type (List<Country>) will cause a compilation warning.


Spring Data JPA Composite Primary Key Mapping Example, Spring Data JPA Composite Key with @IdClass Annotation write a simple derived query to fetch all bank accounts by a given account type: For example, with @IdClass, the query is a bit simpler: SELECT account.accountNumber FROM Account account. With @EmbeddedId, we have to do one extra traversal: SELECT book.bookId.title FROM Book book. Also, @IdClass can be quite useful in places where we are using a composite key class that we can't modify.


JPA + Hibernate, JPA - OneToMany foreign key mapping strategy for persisting Map with basic type keys and entity values Map entity values, applying foreign key mapping strategy is similar to other collection String s) { System.out.printf("'%s'%n", s); Query query = em. nativeQuery(em, "Select * from Employee"); ExampleMain. As the name implies we are going to use an interface here. In this type, we create an interface with only getter methods of properties we want from an entity class. This interface will be the return type of query method we write in Spring Data JPA’s Repository interface. It has the following three types: Close Projection