JPA OrderColumn 에서의 정렬 order by

How to maintain order in a List relationship using an OrderColumn

JPA 2.0 adds support for an OrderColumn. An OrderColumn can be used to define an order List on any collection mapping. It is defined through the @OrderColumn annotation or <order-column> XML element.

The OrderColumn is maintained by the mapping and should not be an attribute of the target object. The table for the OrderColumn depends on the mapping. For a OneToMany mapping it will be in the target object's table. For a ManyToManymapping or a OneToMany using a JoinTable it will be in the join table. For an ElementCollection mapping it will be in the target table.

Example of a collection order column database

EMPLOYEE (table)

EMPLOYEE_PHONE (table)

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PHONE(table)

Example of a collection order column annotation

@Entity
public class Employee {
  @Id
  private long id;
  ...
  @OneToMany
  @OrderColumn(name="INDEX")
  private List<Phone> phones;
  ...
}
 
@Entity
public class Phone {
  private int index = 0;
}

Example of a collection order column XML

<entity name="Employee" class="org.acme.Employee" access="FIELD">
    <attributes>
        <id name="id"/>
        <one-to-many name="phones">
            <order-column name="INDEX"/>
        </one-to-many>
    </attributes>
</entity>