Item « Map « JPA Q&A

1. Mapping items-itemtags-tags tables with nhibernate    stackoverflow.com

Lets say i have this database design:

Items
  Id
  Name
  Desc

ItemTags
  ItemId
  TagId

Tags
  Id
  Tag

class Item
 ...

2. HQL: order all items by a specific item in its map    stackoverflow.com

I am quite new to Hibernate and currently struggling a bit with HQL. I have the following mapping and would like to get all "Industry" entities ordered by the "translation" for ...

3. JPQL for Entities with No Items in ManyToMany Relationship    stackoverflow.com

Simple JPA/JPQL question. I have an entity with a ManyToMany relationship:

@Entity
public class Employee {      
  @ManyToMany
  @JoinTablename="employee_project"
      joinColumns={@JoinColumn(name="employee_id"}
  ...

4. How to count total items in @ManyToMany    stackoverflow.com

I got my model

public class Comic implements Serializable {

@Id
@Basic(optional = false)
@Column(name = "id")
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;

@ManyToMany
private Set<User> owners;

(lots of blah blah blah)    
}

5. Hibernate: How to select a single item based on a foreign key column that is part of an association mapping?    stackoverflow.com

Hullo, So... I have the following objects:

public class Person {
   // some other getters/setters omitted.
   void setAddress(Address addy) {
       // omitted
  ...

6. How to delete a ManyToMany item using JPQL?    stackoverflow.com

I have two models, say :

BlogPost(title, message)
Tags(name)

DELETE FROM BlogPost b WHERE b IN :list

7. hibernate @Any mapping, can't fetch the "any" item    stackoverflow.com

Using hibernate @Any mapping to map multiple entities in the same, I haven't be able to build a request to fetch all the objects of a specific class. Hibernate doesn't seem to ...

8. Hibernate - removing item from collection    stackoverflow.com

I wanted to clarify an assumption that I have made, regarding the functionality of Hibernate. Assume I have a Class of A's with a @OneToMany mapping with B's. These ...

9. How Filter by the number of items in child collection?    forum.hibernate.org

Hi there. I want to create a filter that selects items with his child items greater than some value, ie. Invoice, have 'n' Invoice-Items, i want select all the Invoices where his Invoice-Items count is greater than some value, I dont wanna do it with simple code after a query is maded, because I need make a paginated request. Thanks.

10. How to map a view of non-unique items?    forum.hibernate.org

11. mapped collection contains 100000 items but query returned 5    forum.hibernate.org

Hibernate version:2.1.6 Below is a System.out and stack trace that I added to the set method of a mapped class which takes a collection. Note the size of the List set into my object is 100000 even though the generated sql only returns some 15 rows. I cannot see anything abnormal in the debug statements. Any suggestions would be appreciated. [java] ...

12. Regarding mapping collections and adding a collection item    forum.hibernate.org

Hibernate version: 2/3 with cascade="all" In general one-to-many mapping situation such as this: "An Order has Many OrderItems" I have Order and OrderItem classes mapped such that I can do: orderObject.getOrderItems(); to retrieve all the OrderItems associated with that Order. and if I wanna add an OrderItem Object to that Order, then I can do: orderObject.getOrderItems().add( aNewOrderItem ); where aNewOrderItem is ...

13. How to map in one class 2 collections of the same ITEM class    forum.hibernate.org

Try to design your database like below :- Item :- itemId(p.k.) itemName Person personId(p.k.) item1(F.k.)-->Item item2(F.k.)-->Item That means your pojos for above Two Tables will be like below:- public class Item { private long itemId; private String itemName; // setter getter of all attributes } public class Person { private long personId; private Item item1; private Item item2; // setter getter ...

14. HQL: order all items by a specific item in its map    forum.hibernate.org