JPA WHERE clause - jpa

Question

I am asking about WHERE clause. I have searched internet but I didn`t find answer for my question.
I have a few entity classes, which i represent below:
#NamedQuery(name = "selectTrasy",
query = "SELECT t FROM Trasa t WHERE t.raport = :raport ORDER BY t.id")
#Entity
public class Trasa implements Serializable {
#Id
#Column(name = "id", unique = true )
#GeneratedValue
private Long id;
#Column(name = "data_z")
private Date dataz;
#Column(name = "data_do")
private Date datado;
#Column(name = "czas_z")
private String czasZ;
#Column(name = "czas_do")
private String czasDo;
#OneToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "miejscowosc_z")
private MiejscowoscDB miejscowoscZ;
#OneToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "miejscowosc_do")
private MiejscowoscDB miejscowoscDo;
#OneToOne(fetch = FetchType.LAZY)
private Uzytkownik user;
#OneToOne(fetch = FetchType.LAZY)
private Raport raport;
#Override
public boolean equals(Object other) {
return (other != null && getClass() == other.getClass() && id != null)
? id.equals(((Trasa) other).id)
: (other == this);
}
#Override
public int hashCode() {
return (id != null)
? (getClass().hashCode() + id.hashCode())
: super.hashCode();
}
//next I have getters and setters
}
#Entity
public class Raport implements Serializable {
#Id
#Column(name = "id", unique = true )
#GeneratedValue
private Long id;
#Column(name = "data")
private Date data;
#Column(name = "nazwa")
private String nazwa;
#Enumerated(EnumType.STRING)
private Powod powod;
#OneToOne(fetch = FetchType.LAZY)
private Uzytkownik uzytkownik;
#Override
public boolean equals(Object other) {
return (other != null && getClass() == other.getClass() && id != null)
? id.equals(((Raport) other).id)
: (other == this);
}
#Override
public int hashCode() {
return (id != null)
? (getClass().hashCode() + id.hashCode())
: super.hashCode();
}
//getters and setters
}
My question is why this query doesn`t work properly. Returned list is empty, but recordes exists in database, when I want return all Trasa records there is everything ok, only not works when I add WHERE clause with raport property.
trasy = (List<Trasa>)(manager.createNamedQuery("selectTrasy")
.setParameter("raport", propertyWydatek.getRaport())
.getResultList());

Answer 1

Change your query to:
#NamedQuery(name = "selectTrasy",
query = "SELECT t FROM Trasa t WHERE t.raport.id = :raportId ORDER BY t.id")
and run it like this:
trasy = (List<Trasa>)(manager.createNamedQuery("selectTrasy")
.setParameter("raportId", propertyWydatek.getRaport().getId())
.getResultList());
Other version of the query:
#NamedQuery(name = "selectTrasy",
query = "SELECT t FROM Trasa t join t.raport r WHERE r.id = :raportId ORDER BY t.id")