merge « Field « JPA Q&A

1. JPA merge readonly fields stackoverflow.com

We have the simplest CRUD task with JPA 1.0 and JAX-WS.
Let's say we have an entity Person.

@Entity
public class Person
{
   @Id
   private String email;

   @OneToOne(fetch = ...

2. If I persist a class using hibernate, how do I ensure that the values of some fields are merged while others are created? stackoverflow.com

Suppose I have a class 'Cheese' with fields type and purchaseDate, such that:

public class Cheese{
    CheeseType cheeseType;
    String purchaseDate;

    public setPurchaseDate(String value){
 ...

3. setting values of some fields to null using JPA stackoverflow.com

In jpa merge, are all coumns of updated or only the columns which has new values? While updating if i set value of some attribute to null, will null value will be ...

4. updating a field of a object in hibernate stackoverflow.com

I have a object A which maps to table A in DB

class A{

 Interger id;
 String field2,field2;field3 ,... fieldN;
 //lots of other attribute
}

Now i want to write a DAO ...

5. JPA(Hibernate) merge readonly fields forum.hibernate.org

We have the simplest CRUD task with JPA 1.0 (Hibernate) and JAX-WS. Let's say we have an entity Person. Code: @Entity public class Person { @Id private String email; @OneToOne(fetch = FetchType.LAZY) @JoinColumn(insertable = false, updatable = false) private ReadOnly readOnly; @Column ...

6. The object returned by merge() has all null in @Id fields forum.hibernate.org

Hi, I use the merge() procedure to create a new object in DB or update an existing object if it already exists. The problem arises when: 1. I merge an object which does not exist and supposed to be created 2. The object's entity hash two @Id fields, one of them is @ManyToOne reference. After the merge(): 1. All non-id fields ...

7. Problem merging many-to-many with additional fields forum.hibernate.org

............ @ManyToMany(targetEntity = Business.class) @JoinTable(name = "ASSET_BUSINESSES", joinColumns = { @JoinColumn(name = "ASSETID") }, inverseJoinColumns = { @JoinColumn(name = "BUSINESSID") }) @Cascade(value = { org.hibernate.annotations.CascadeType.SAVE_UPDATE, org.hibernate.annotations.CascadeType.MERGE, org.hibernate.annotations.CascadeType.PERSIST }) ...