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Java Source Code / Java Documentation » Database ORM » toplink » javax.persistence

Source Cross Reference Class Diagram Java Document (Java Doc)

javax.persistence .GenerationType

GenerationType
public enum GenerationType (Code)
	Defines the types of primary key generation. since: Java Persistence 1.0

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

Field Detail

AUTO
Enum Constant AUTO(Code)
	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.

IDENTITY
Enum Constant IDENTITY(Code)
	Indicates that the persistence provider must assign primary keys for the entity using database identity column.

SEQUENCE
Enum Constant SEQUENCE(Code)
	Indicates that the persistence provider must assign primary keys for the entity using database sequence column.

TABLE
Enum Constant TABLE(Code)
	Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness.

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