Package javax.persistence

Enum GenerationType

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<GenerationType>
    public enum GenerationType
extends java.lang.Enum<GenerationType>
    Defines the types of primary key generation strategies.
    See Also:
    GeneratedValue
    Since:
    1.0

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      AUTO
      Indicates that the persistence provider should pick an appropriate strategy for the particular database.
      IDENTITY
      Indicates that the persistence provider must assign primary keys for the entity using a database identity column.
      SEQUENCE
      Indicates that the persistence provider must assign primary keys for the entity using a database sequence.
      TABLE
      Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.

    • Method Summary

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

      • TABLE

        public static final GenerationType TABLE
        Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.

      • SEQUENCE

        public static final GenerationType SEQUENCE
        Indicates that the persistence provider must assign primary keys for the entity using a database sequence.

      • IDENTITY

        public static final GenerationType IDENTITY
        Indicates that the persistence provider must assign primary keys for the entity using a database identity column.

      • AUTO

        public static final GenerationType AUTO
        Indicates that the persistence provider should pick an appropriate strategy for the particular database. The AUTO generation strategy may expect a database resource to exist, or it may attempt to create one. A vendor may provide documentation on how to create such resources in the event that it does not support schema generation or cannot create the schema resource at runtime.

    • Method Detail

      • values

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

      • valueOf

        public static GenerationType 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