How to use multiple JOIN FETCH in one JPQL query

Question

I have below entities:

public class Category {
   private Integer id;

   @OneToMany(mappedBy = "parent")
          


        

Answer 1

Here is a working example of complex join and multiple consition:

    String query_findByProductDepartmentHospital = "select location from ProductInstallLocation location "
            + " join location.product prod " + " join location.department dep "
            + " join location.department.hospital hos " + " where  prod.name = :product "
            + " and dep.name.name = :department " + " and hos.name = :hospital ";

    @Query(query_findByProductDepartmentHospital)
    ProductInstallLocation findByProductDepartmentHospital(@Param("product") String productName,@Param("department") String departName, @Param("hospital") String hospitalName);