Package org.eclipse.persistence.annotations

Annotation Type JoinFetch

@Target({METHOD,FIELD}) @Retention(RUNTIME) public @interface JoinFetch
A JoinFetch annotation can be used on any relationship mapping, (OneToOne, ManyToOne, OneToMany, ManyToMany, BasicCollection, BasicMap). It allows the related objects to be joined and read in the same query as the source object. Join fetching can also be set at the query level, and it is normally recommended to do so as all queries may not require joining. Batch reading should be considered as an alternative to join fetching, especially for collection relationships as it is typically more efficient.
Author:
James Sutherland

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    JoinFetchType
    value
    (Optional) The type of join-fetch to use.

  • Element Details

    • value

      JoinFetchType value
      (Optional) The type of join-fetch to use. Either an inner or outer-join, an outer-join allows for null/empty values, where as inner does not.
      Default:
      INNER