About GenerationType

api-jpa

javax.persistence.GenerationType

Defines the types of primary key generation strategies.(Enum of JPA)

 
api-jpa

JPA Annotations for Value Generation

Reference (JavaDoc) of JPA 2 value generation annotations, including @GeneratedValue, @SequenceGenerator and @TableGenerator.... field level, the @GeneratedValue with an optional GenerationType strategy is specified: javax.persistence.GeneratedValue javax.persistence.GenerationType The @GeneratedValue annotation can also ...

 
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Find the error...JPA ENTITY HIBERNATE

Hey guys....i am searching for some days for the problem...Maybe one of you can find the error   DATABASE SHEMA: https://www.file-upload.net/download-12530779/2017-06-0214_25_00-MySQLWorkbench.png.html       Entities:   ... ; import javax. persistence . GenerationType ; import javax. persistence . Id ; ... @ GeneratedValue ( strategy = GenerationType . IDENTITY ) private int id ; @ ...

 
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@OneToMany(fetch = FetchType.LAZY) list is always null

Hello. @OneToMany(fetch = FetchType.LAZY) doesn't work when using EJB or something else related to J2EE. parent.getChildren() returns null. Here is a simple example: Bean: ... @ GeneratedValue ( strategy = GenerationType . SEQUENCE , generator = "b" ) ... @ GeneratedValue ( strategy = GenerationType . SEQUENCE , generator = "b" ) ...

 
api-jpa

values()

Returns an array containing the constants of this enum type.(Static Method of javax.persistence.GenerationType)

 
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find() cost unreasonable time!

Hi, I make a full binary tree of 4095 node, I check the first 9 node, but the root cost 24 seconds, why? Result: ... @ GeneratedValue ( strategy = GenerationType . IDENTITY ) private int id ; @ ... ; import javax. persistence . GenerationType ; import javax. persistence . Id ; ...

 
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List always null

I have the following classes: @Entity public class Noticia implements Serializable {     private static final long serialVersionUID = 1L;     @Id     @GeneratedValue(strategy = GenerationType.AUTO)     private Long id;     @ManyToOne(targetEntity = Categoria.class)     private List<Categoria> categorias;   ... @ GeneratedValue ( strategy = GenerationType . AUTO ) private Long id ; @ ... @ GeneratedValue ( strategy = GenerationType . AUTO ) private Long id ; @ ...

 
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mappedBy problem

If I put the mappedBy element to the @OneToMany, the owned side (the many side) will never persist ! for example @Entity public class Employee { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) public Long id; public String name; @OneToMany(targetEntity=Address.class,mappedBy="employee") public List<Address> addresses; }   @Entity... @ GeneratedValue ( strategy = GenerationType . IDENTITY ) public Long id ; ... @ GeneratedValue ( strategy = GenerationType . IDENTITY ) public Long id ; ...

 
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Bug: ClassCastException by retrieval

Hi, when a generic array put into ObjectDB, its type changed to Object[]! codes: ... ; import javax. persistence . GenerationType ; import javax. persistence . Id ; ... @ GeneratedValue ( strategy = GenerationType . IDENTITY ) int id ; private TN [ ...

 
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Double persist of Entity field with Cascade.ALL

I am building a JavaEE application using Netbeans 7.0.1, Glassfish 3.1 and ObjectDB 2.3.3. I have a Book class with entity field Chapter which has a CascadeType.ALL property. The Book fields are as follows: @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; private String bookTitle; @OneToMany(cascade= CascadeType.ALL, fetch= FetchType.EAGER) private List<Chapter> chapters; The Chapter fields are as follows: ... @ GeneratedValue ( strategy = GenerationType . AUTO ) private Long id ; private ... @ GeneratedValue ( strategy = GenerationType . AUTO ) private Long id ; private ...