Package org.hibernate.engine

Enum FetchStyle

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<FetchStyle>
    public enum FetchStyle
extends java.lang.Enum<FetchStyle>
    Enumeration of values describing HOW fetching should occur.
    See Also:
    FetchTiming

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      BATCH
      Initializes a number of indicated data items (entities or collections) in a series of grouped sql selects using an in-style sql restriction to define the batch size.
      JOIN
      Inherently an eager style of fetching.
      SELECT
      Performs a separate SQL select to load the indicated data.
      SUBSELECT
      Performs fetching of associated data (currently limited to only collections) based on the sql restriction used to load the owner.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static FetchStyle valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static FetchStyle[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.

      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

    • Enum Constant Detail

      • SELECT

        public static final FetchStyle SELECT
        Performs a separate SQL select to load the indicated data. This can either be eager (the second select is issued immediately) or lazy (the second select is delayed until the data is needed).

      • JOIN

        public static final FetchStyle JOIN
        Inherently an eager style of fetching. The data to be fetched is obtained as part of an SQL join.

      • BATCH

        public static final FetchStyle BATCH
        Initializes a number of indicated data items (entities or collections) in a series of grouped sql selects using an in-style sql restriction to define the batch size. Again, can be either eager or lazy.

      • SUBSELECT

        public static final FetchStyle SUBSELECT
        Performs fetching of associated data (currently limited to only collections) based on the sql restriction used to load the owner. Again, can be either eager or lazy.

    • Method Detail

      • values

        public static FetchStyle[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (FetchStyle c : FetchStyle.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static FetchStyle valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null