Two id in hibernate table
-
Is there possibility of two fields being id in a hibernate table? I have two ids that need to be unica in par in the table. But I don't know how to implement it.
-
How to do using @EmbeddedId
You can do this:
@Embeddable class ClassePrimeira implements Serializable {@Id
Integer chaveUm;
@Id
Integer chaveDois;// get’s e set’s
}
@Entity
public class Classe {@EmbeddedId
private ClassePrimeira id;
// get’s e set’s
}
Note @Id, @IdClass, or @EmbeddedId for Composite Keys: When
a primary key consists of multiple columns, we need a
different strategy to group them so that we can allow
that the persistence tool manipulates key values as a
only object. In this way, we need to create a class that represents
that primary key. This class as a general rule must be public,
must have a default constructor, must be serializable, and must
implement the hashCode() and equals() methods that allows Hibernate
test collisions in primary keys.Source: https://www.devmedia.com.br/mapeamento-no-hibernate-com-anotacoes/29472
Although above show the basics of how to declare two id's in one model, you can enter the hibernate documentation: http://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html_single/#mapping-declaration-id , and despite being in English in item 5.1.2.1 has a good explanation for what you want to do.
