Package javax.persistence

Enum FetchType

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<FetchType>
    public enum FetchType
extends java.lang.Enum<FetchType>
    Defines strategies for fetching data from the database. The EAGER strategy is a requirement on the persistence provider runtime that data must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime that data should be fetched lazily when it is first accessed. The implementation is permitted to eagerly fetch data for which the LAZY strategy hint has been specified. 
       Example:
   @Basic(fetch=LAZY)
   protected String getName() { return name; }
    See Also:
    Basic, ElementCollection, ManyToMany, OneToMany, ManyToOne, OneToOne
    Since:
    1.0

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      EAGER
      Defines that data must be eagerly fetched.
      LAZY
      Defines that data can be lazily fetched.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static FetchType valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static FetchType[] 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

      • LAZY

        public static final FetchType LAZY
        Defines that data can be lazily fetched.

      • EAGER

        public static final FetchType EAGER
        Defines that data must be eagerly fetched.

    • Method Detail

      • values

        public static FetchType[] 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 (FetchType c : FetchType.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static FetchType 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