hibernatejpaormeclipselinkopenjpa

What is referencedColumnName used for in JPA?

In JPA there is an attribute called referencedColumnName that can be set on @JoinColumn, @PrimaryKeyJoinColumn what is the idea behind this setting, can someone give a good example of where this can be used?

Solution

  • It is there to specify another column as the default id column of the other table, e.g. consider the following

    TableA
  id int identity
  tableb_key varchar


TableB
  id int identity
  key varchar unique

// usage in class for TableA
@JoinColumn(name="tableb_key", referencedColumnName="key")