Defines the types of primary key generation strategies.
- Since:
- Java Persistence 1.0
- See Also:
GeneratedValue
Oct 28, 2018 Note that for both types of composite ids, the primary key class can also contain @ManyToOne attributes. Hibernate also allows defining primary-keys made up of @ManyToOne associations combined with @Id annotation. In this case, the entity class should also fulfill the conditions of a primary-key class. Oct 09, 2017 In this video you will learn how GenerationType.IDENTITY primary key generation strategy works. Below is the GitHub link to download source: https://github.c. I am trying to create a Privilege class with Annotations whose Primary Key is a String. I will assign them manually while inserting. Therefore no need for hibernate to generate a value for it.
Enum Constant Summary |
---|
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. |
Windows 10 activation key generator download free. Aug 08, 2017 This annotation defines the types of primary key generation strategies. If this annotation is not used then application is responsible to populate and manage @Id field values itself. The use of the GeneratedValue annotation is only required to be supported for simple primary keys. GenerationType enum defines four strategies: Generation. 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.
Method Summary | |
---|---|
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, inthe 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
- Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.
SEQUENCE
- Indicates that the persistence provider must assign primary keys for the entity using a database sequence.
IDENTITY
- Indicates that the persistence provider must assign primary keys for the entity using a database identity column.
AUTO
Foreign Key
- 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
- Returns an array containing the constants of this enum type, inthe order they are declared. This method may be used to iterateover the constants as follows:
- Returns:
- an array containing the constants of this enum type, inthe order they are declared
valueOf
- Returns the enum constant of this type with the specified name.The string must match exactly an identifier used to declare anenum 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:
IllegalArgumentException
- if this enum type has no constantwith the specified namejava.lang.NullPointerException
- if the argument is null
Overview | Package | Class | Tree | Deprecated | Index | Help |
Copyright © 2009-2011, Oracle Corporation and/or its affiliates. All Rights Reserved. Use is subject to license terms.
Generated on 10-February-2011 12:41
Types Of Primary Key Generation In Hibernate In South Carolina
Scripting on this page tracks web page traffic,but does not change the content in any way.