Using Named Parameter in native SQL query with Spring Data JPA

wallwalker :

Was given the below query to run against a DB2 database however it returns below error in my Spring Boot App.

I've researched that :COL_1_1001 should be some sort of named parameter or host variable(DB2) but have not been able to find a similar example of what I'm trying to do. I have only ever used ?1 to set a parameter using @Query which to my understanding is for JPQL. Since I'm attempting a native SQL query here, not sure if this should work.

@Repository 
public interface SomeRepository extends JpaRepository<Entity, EntityID> {

@Query(value="SELECT COL_1"
              + ",COL_2"
              + ",COL_3"
              + "FROM TABLE_A"
              + "WHERE COL_1 = :COL_1_1001", nativeQuery = true)
List<Entity> getEntityDetails();
}

[ERROR]~2019-09-19-07.26.30.347CDT~~~~~ o.a.c.c.C.[.[.[.[dispatcherServlet] Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: Named parameter not bound : COL; nested exception is org.hibernate.QueryException: Named parameter not bound : COL] with root cause org.hibernate.QueryException: Named parameter not bound : COL

Piotr Podraza :

You use variable COL_1_1001 in your query but do not provide it. You have to add an argument annotated with @Param so the value can be injected into query.

Change:

@Query(value="SELECT COL_1"
              + ",COL_2"
              + ",COL_3"
              + "FROM TABLE_A"
              + "WHERE COL_1 = :COL_1_1001", nativeQuery = true)
List<Entity> getEntityDetails();

to:

@Query(value="SELECT COL_1"
              + ",COL_2"
              + ",COL_3"
              + "FROM TABLE_A"
              + "WHERE COL_1 = :col", nativeQuery = true)
List<Entity> getEntityDetails(@Param("col") String col); // it may not be a string - use the actual tyle of COL_1

For more info look into Spring Data documentation