Annotation Type BatchFetch

  • @Target({METHOD,FIELD})
    public @interface BatchFetch
    A BatchFetch annotation can be used on any relationship mapping, (OneToOne, ManyToOne, OneToMany, ManyToMany, ElementCollection, BasicCollection, BasicMap). It allows the related objects to be batch read in a single query. Batch fetching can also be set at the query level, and it is normally recommended to do so as all queries may not require batching.
    James Sutherland
    EclipseLink 2.1
    • Optional Element Summary

      Optional Elements 
      Modifier and Type Optional Element Description
      int size
      Define the default batch fetch size.
      BatchFetchType value
      (Optional) The type of batch-fetch to use.
    • Element Detail

      • value

        BatchFetchType value
        (Optional) The type of batch-fetch to use. Either JOIN, EXISTS or IN. JOIN is the default.
      • size

        int size
        Define the default batch fetch size. This is only used for IN type batch reading and defines the number of keys used in each IN clause. The default size is 256, or the query's pageSize for cursor queries.