Hibernate - HQL to fetch a collection from Unidirectional OneToMany relationship

Question

I have an Class with a unidirectional one to many relationship as follows:

public class Order {
    @OneToMany(cascade = CascadeType.ALL)
    @JoinTable(name=\"o         


        

Answer 1

select item from Order order
inner join order.items item
where order = :order
and ...

HQL queries use entities and their associations. The fact that the association uses a join table or not is not important for HQL: you navigate through associations and Hibernate does the appropriate translation to SQL.

Answer 2

It sounds like you want to map the other side of this relationship i.e. make this bi-directional mapping.

Then you can use the order number in your HQL:

from Item as item where item.amount > :amount and item.order.id = :orderId

From the HQL documentation:

from Cat as cat where cat.mate.id = 69 The query is efficient and does not require a table join.

The fact that you are trying to do this query suggests that the relationship between a Line and its Order is important!