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101

javax.persistence.GenerationType

javax.persistence Enum GenerationType java.lang.Object java.lang.Enum<javax.persistence.GenerationType> javax.persistence.GenerationType Implemented Interfaces: Serializable, Comparable<GenerationType> Defines the types of primary key generation strategies. Since: JPA 1.0
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values()

Static Method javax.persistence.GenerationType GenerationType[] values() Returns an array containing the constants of this enum type. This method may be used to iterate over the constants as follows: for (GenerationType c : GenerationType.values()) System.out.println(c) Returns: an array
90

valueOf(name)

Static Method javax.persistence.GenerationType GenerationType valueOf( 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. Parameters: name - the name of the enum constant
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GenerationType.IDENTITY

Enum Constant javax.persistence.GenerationType IDENTITY Indicates that the persistence provider must assign primary keys for the entity using a database identity column. Since: JPA 1.0
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GenerationType.AUTO

Enum Constant javax.persistence.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
88

GenerationType.TABLE

Enum Constant javax.persistence.GenerationType TABLE Indicates that the persistence provider must assign primary keys for the entity using an underlying database table to ensure uniqueness. Since: JPA 1.0
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GenerationType.SEQUENCE

Enum Constant javax.persistence.GenerationType SEQUENCE Indicates that the persistence provider must assign primary keys for the entity using a database sequence. Since: JPA 1.0
35

Auto Generated Values

(strategy=GenerationType.AUTO) long id; : } AUTO is the default strategy, so the following ... @GeneratedValue(strategy=GenerationType.IDENTITY) long id; : } The IDENTITY strategy ... above: @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="seq") @Id long id; } Unlike AUTO
17

JPA Annotations for Value Generation

Automatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) persistent fields. At the field level, the @GeneratedValue with an optional GenerationType strategy is specified: The @GeneratedValue annotation
7

javax.persistence.GeneratedValue

: "" Since: JPA 1.0 GenerationType strategy (Optional) The primary key generation strategy ... key. Default value: javax.persistence.GenerationType.AUTO Since: JPA 1.0

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