structure « Map « JPA Q&A





1. Good object structure for results of my Hibernate left outer join    stackoverflow.com

I need to make an outer join query that retrieves all of the definitions and any properties they have associated with them that are associated with a certain company. I ...

2. Merge two databases with identical structure and Hibernate mappings    stackoverflow.com

Following situations: I got two databases featuring an identical structure. On top of each of these databases runs an instance of the same app using Hibernate for ORM. The two are completely ...

3. JPA and a parent children relationship in a tree data structure    coderanch.com

Hi, I've got a tree structure of TreeNode's: A /|\ B C D The TreeNode class is an JPA entity and in their class definition we can find: @ManyToOne @JoinColumn(name="parent") TreeNode parent; @OneToMany(mappedBy="parent") List children; In this application getParent() will be called a lot while getChildren() will be called fairly seldom. It should also be added that the tree structure will ...

4. Mapping update after changing database structure    forum.hibernate.org

Hi, I am currently facing the following issue: my application has been set up, but there have been done some manual changes to the database structure. Now, my question is how do I propagate these changes to the mapping in java? Is there any kind of tool or is this an entirely manual process, too? Any help or hint is greatly ...

5. Tree structure map to table by hibernate    forum.hibernate.org

Hi all, I would like to implement a tree structure for different layers of categories E.g Trades -> electrical, plumbing, handyman... | |->parttime, fulltime, experienced, non-experienced public class Category { private ArrayList subs; private String description; public Category(){} public Category(String _desc) { description = _desc; } public void setList(Arraylist arylst) { .... } public Arraylist getList() { return subs; } } ...

6. simple tree structure node children problem    forum.hibernate.org

Newbie Joined: Sun May 22, 2011 1:29 pm Posts: 1 I'm very confused by the behavior I'm seeing. I must be doing something wrong, but the code I have seems very similar to other examples I've seen in my googling (some from this forum though I neglected to keep around the links). I'm just trying to represent some simple hierarchical data. ...

7. How to map this class structure?    forum.hibernate.org

I have to map some classes written by other programmers. They don't want their code to be modified because of hibenate. This is the core code. public abstract class Base { int iNumbers; String sName; //getter and setter for properties } public class Detail extends Base { byte[] details; //getter and setter for properties } I don't think hibernate could mapping ...

8. How do you recommend to map such a structure?    forum.hibernate.org

Hello, I got a question about how to map the following kind of implementation of a strategy pattern... public Class A { String property1; String property2; Policy property3; .... } public interface Policy { //method definitions... } public class PolicyX implements Policy { String propertyx1; int propertyx2; .... } public class PolicyY implements Policy { String propertyy1; .... } public class ...

9. Mapping same classes to different table structure    forum.hibernate.org

Hi there, Using Hiberante 2.1.3 I have the following mappings agenciesLocations.hbm.xml Code: ...





11. please, help m with mapping for this relational structure!    forum.hibernate.org

we have USERS table: Code: ... USER_ID bigint, USER_NAME text, ... and SKILLS table: Code: ... SKILL_ID ...

12. mapping structure proposal - bill of materials    forum.hibernate.org

hi, I'm looking forward to hear your advice regarding mapping standard bill of materials table The bom row looks like that parent|child| quantity Both parent and child are foreign keys to code table. Additionally child can be a parent for another code. The logic is simple, for instance car has an engine, engine is build from other elements and so on. ...

13. Need to Map Odd Table Structure - Any Ideas??    forum.hibernate.org

I'm trying to map a legacy database structure into a new Hibernate-based application. I can't figure out how (or if it's possible) to map one particular aspect of it. There are three tables involved: Employee - employeeId - name - dateOfBirth - employeeNumber Visitor - visitorId - name - dateOfBirth - referralCode Accident - victimType - victimId There are two types ...

14. question: How to map two tables with identical structures    forum.hibernate.org

We have a legacy system, and we need to map two tables with identical structures, one has current info and the other one has historical info. I do not know how should we handle this case. In Java they should we be mapped to a single type, and only the DAO should be aware of which table is being used. We ...

15. Problems with many-to-one in inherited class structures    forum.hibernate.org

I can't get the users of a group. I have three different classes/tables. 1. Id, contains id and parent 2. User, contains user info, extends Id 3. Group, contains group info, extends Id Tables: Code: _______ | Id |_______ | | PK ...





17. Mapping Help For Tree Structure    forum.hibernate.org

I need help in mapping a tree object structure. I'd like to store the tree in the following tables (truncated for simplicity): Category id title parentId TreePath id ancestorId So, if I have the following tree: 1 /\ 2 4 / 3 The tables would look like: Category 1 "One" 1 2 "Two" 1 3 "Three" 2 4 "Four" 1 TreePath ...

18. Design question, inheritance, mapping, structure    forum.hibernate.org

Hello Everybody! We have the following structural design question: The application we work on is a client-server-application, which connects a rich-client with its server via spring-remoting. This is of importance because it explains, why we are interested in optimizing the amount of data transferred over the line. In our database we have an entity with quite a lot of fields and ...

19. How can I map that structure?    forum.hibernate.org

public class MyFirstClass { private long id = -1; private MySecondClass class2 = null; private List class2List1 = null; private List class2List2 = null; private List class2List3 = null; private String content = null; private boolean property1 = true; private boolean property2 = false; ...

20. Tree structure and subclassed child elements    forum.hibernate.org

I have a tree structure where the class HierarchyNode acts as a base class. Furthermore, i have three classes (HierarchyRootNode, AlbumHierarchyNode, TrackHierarchyNode) which extends HierarchyNode. My tree structure could look as follows: - HierarchyRootNode -- AlbumHierarchyNode ---- AlbumHierarchyNode ---- AlbumHierarchyNode -- TrackHierarchyNode ---- TrackHierarchyNode ---- TrackHierarchyNode The problem: The AlbumHierarchyNode has a collection "albums". Each album element has a collection "territories", ...

21. Hierarchy structure vs. collection mapping    forum.hibernate.org

@MappedSuperclass @Entity @Table(name = "group") public class GroupInfo implements Serializable { protected Integer id; //... @Basic @Id @javax.persistence.SequenceGenerator(name = "group_id_sequence", sequenceName = "se_group_id_seq") @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "group_id_sequence") @Column(name = "id") public Integer getId() { ...