About GeneratedValue

11-20 of 132Refresh
JPA Doc
18

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
Tutorial
18

Step 2: Entity Class and Persistence Unit

; import java.sql.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue ... static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue
Tutorial
13

Step 2: Define a JPA Entity Class

{ private static final long serialVersionUID = 1L; @Id @GeneratedValue private long
Tutorial
13

Step 2: Define a JPA Entity Class [2011-02-11]

; @Id @GeneratedValue private long id; private int x; private int y; public
Tutorial
13

Step 2: Define a JPA Entity Class

; @Id @GeneratedValue private long id; private int x; private int y; public
JPA Doc
7

javax.persistence.TableGenerator

is specified for the GeneratedValue annotation. A table generator may be specified on the entity class or ... _ID", allocationSize=1) @Id @GeneratedValue(strategy=TABLE, generator ... ", pkColumnValue="ADDR_ID") @Id @GeneratedValue(strategy=TABLE, generator="addressGen
JPA Doc
3

javax.persistence.GenerationType

See Also: GeneratedValue Learn how to define and use automatic value generation in Chapter 2 of the ObjectDB
JPA Doc
3

javax.persistence.Id

: @Id public Long getId() { return id; } Since: JPA 1.0 See Also: Column GeneratedValue Learn
JPA Doc
3

javax.persistence.SequenceGenerator

javax.persistence Annotation SequenceGenerator Target: Classes and fields (including property get methods) Defines a primary key generator that may be referenced by name when a generator element is specified for the GeneratedValue annotation. A sequence generator may be specified on the entity
Forum
3

Persist error @ManyToMany how to define correct entities relationships

too). @Entity public class Product implements Serializable { @Id @GeneratedValue ... implements Serializable { @Id //@GeneratedValue private long id ... .GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToMany; import javax