Package org.hibernate.engine

Enum Class FetchStyle

java.lang.Object
java.lang.Enum<FetchStyle>
org.hibernate.engine.FetchStyle
All Implemented Interfaces:
Serializable, Comparable<FetchStyle>, Constable
public enum FetchStyle extends Enum<FetchStyle>
Enumeration of values describing how fetching should occur.
See Also:

  • Nested Class Summary

    Nested classes/interfaces inherited from class java.lang.Enum

    Enum.EnumDesc<E extends Enum<E>>

  • 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

    Modifier and Type
    Method
    Description
    static FetchStyle
    valueOf(String name)
    Returns the enum constant of this class with the specified name.
    static FetchStyle[]
    values()
    Returns an array containing the constants of this enum class, in the order they are declared.

    Methods inherited from class java.lang.Enum

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

    Methods inherited from class java.lang.Object

    getClass, notify, notifyAll, wait, wait, wait

  • Enum Constant Details

    • 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 Details

    • values

      public static FetchStyle[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static FetchStyle valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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:
      IllegalArgumentException - if this enum class has no constant with the specified name
      NullPointerException - if the argument is null