How can I use a NamedQuery to find an entity over a jointable?
I have an abstract parent class/entity with @Inheritance(strategy=InheritanceType.JOINED) and two subclasses/subentities.
Hence, in the database I have a parent table (sdrs) and two subtables (xSdrs and ySdrs).
There is another table reservations which shall have a Many-to-Many relationship to table sdrs. That's why I created a jointable between reservations and sdrs.
I intend to have a NamedQuery in the parent entity Sdr to be able to find the key for a record/entity of XSdr or YSdr respectively over the jointable.
In class Sdr I have:
@NamedQuery(name="Sdr.findBySdrId", query="SELECT s FROM Sdr s "
+ "INNER JOIN s.reservations res WHERE res.sdrs = :transactionId")
and
@ManyToMany(fetch=FetchType.EAGER, cascade=CascadeType.ALL)
@JoinTable(name="sdrs_has_reservations",
joinColumns = {
@JoinColumn(name="sdrs_id", referencedColumnName="sdrId", nullable=false)
}, inverseJoinColumns={
@JoinColumn(name="reservations_id", referencedColumnName="reservationId", nullable=false)
})
private List<Reservation<T>> reservations;
But, of course, this sets the transactionId to reservationId which consequentially fails.
On the inverse side I have:
@ManyToMany(mappedBy="reservations", fetch=FetchType.EAGER)
private List<Sdr<T>> sdrs;
So, how do I have to implement the named query in class/entity Sdr to be able to get the proper Sdr (and its related reservations) with an Sdr ID to be set as query parameter?
