table « Key « JPA Q&A

1. Problem while reading foreign key table data and primary key table data using hibernate? stackoverflow.com

I have one primary key table and one foreign key table, for the primary key empid of one table(Employee) , has two records in other table(Department). How can i fetch Employee table records ...

2. Hibernate: is it necessary to have primary key in table coderanch.com

Hibernate is a Object-Relational Mapping tool. Any data in a database that does not have a primary key is not relational data, since it can't reliably participate in any relationships without a guarenteed identifier. Entity Relational models that contain entities without a defined primary key are, in my opinion, most probably broken. I say most probably, since there are the odd ...

3. Create table without any key in Hibernate coderanch.com

Hi, Today I was trying to create a table without any ID(primary or composite etc.) When I tried to map that table with corresponding bean, it's giving me compiler error in *.hbm.xml My mapping is as follows:

4. Two foreign keys to same table forum.hibernate.org

Hi, I have two tables: parent A and child B. Table B has two foreign keys that map to the primary key in table A. How do I go about mapping these in NH? I'm trying to use two idbags in the map file for table A, but can't get it to work. Thanks

5. two primary keys in one table forum.hibernate.org

Hi, I have a table Schoole Profile table in which there are two keys 1. id 2. schname. For this how should my .hbm.xml. file look like? Do I have to have two tags one for each? I tried this but it gave an error. Would you please suggest how to have the xml?

6. Using Hibernate on a table without a primary key forum.hibernate.org

I am (hopefully) just about to start on my first Hibernate project and have come across a stumbling block. Would appreciate any advice. I am working on a project where my new code will run side-by-side with legacy code and I cannot change the data model at all. I have come across a situation where one of the main tables has ...

7. linking primary keys of 2 tables forum.hibernate.org

Hi all, what I am trying to do is the following: I have multiple tables. All these tables have a primary key called id (I make sure the keys are unique over all the tables). Then I have a table that should contain all the keys, because I want to be able to reference to all these objects from a central ...

8. non primary key table forum.hibernate.org

9. Foreign Keys to table not managed by Hibernate. forum.hibernate.org

Hi, I'm working with a fairly non-standard system. I'm using XML to describe my Objects and generate my schema. I have some objects which in my database I want to have a foreign key relationships to, but which are from another system not using Hibernate. So, as an example, let's say I have a Hibernate-managed table UserMetadata. I want it to ...

10. Table with no Primary Key vs Hibernate forum.hibernate.org

We have strong interest to work with hibernate in our new project. But I am still confused about tables relationships with foreign key or without defined primary or unique key. Can work hibernate with table, which don`t have any primary,unique key, only foreign key??? How its *.hbm.xml look like in this case? We have problem when we try to use hibernate ...

11. two primary key in one table forum.hibernate.org

12. foreign key into the same table forum.hibernate.org

tetrione Post subject: Posted: Fri Jul 23, 2004 10:36 pm Beginner Joined: Wed Jul 21, 2004 12:28 pm Posts: 27 Location: New York well if you have mapping like this Code:

13. Tables with no primary key. forum.hibernate.org

14. Question about multiple primary keys in one table forum.hibernate.org

Beginner Joined: Wed May 18, 2005 9:48 am Posts: 31 Hi all, I have one table in postgresql with four primary keys. I want to know how to do a select with this four keys. My code is like this: tTickets.hbm.xml Code: ...

15. Two primary keys in one table forum.hibernate.org

I have a legacy database, on which I have to develop an application. In one table there are two primary keys (two separate keys, not a composite key consisting of two columns!): 1. an uuid (surrogate key), which I can generate using Hibenate's uuid-algorithm and 2. an application specific id (customer number), which I have to generate using an existing sequence ...

16. what if i dont have a primary key in a table ??????? forum.hibernate.org

Hey geeks i need a help ... I have a table without a primary key but with a foriegn key with a foriegn key with UNIQUE constraint, which can be used as an id. I am getting an error while running hibernate ... Can anyone tell me what if i dont have PK .. what to do then ??? and if ...

17. Need two foreign keys back to target table forum.hibernate.org

I'm trying to create the mappings for a Person object and a Marriage object where the Person has a set of marriages and each marriage can refer to the bride and groom, who are Person objects. Given the following class implementations: Code: public class Person { protected Set myMarriages = null; public Set ...

18. link table with multiple foreign keys. How? forum.hibernate.org

I have been searching for an answer to this question for some time and I must be missing something. In SQL it is painfully obvious, but I cannot figure out how to do this with hibernate. Table A contains a primary key a_id Table B contains a primary key b_id Table C contains a primary key c_id Table D is my ...

19. Can I use hibernate if my tables have no key? forum.hibernate.org

20. Primary/Foreign key references own table forum.hibernate.org

Hibernate version: 3.1 Name and version of the database you are using: Oracle Database information: Table Person: integer PERSON_ID primary key; varchar FIRST_NAME; integer CREATE_USER_ID foreign key references PERSON_ID; Person table has a PERSON_ID which is a sequence and the primary key. Person has a CREATE_USER_ID which is a foreign key reference to a PERSON_ID. Test Person Data: PERSON_ID = 84 ...

21. Multiple primary keys on a single table forum.hibernate.org

You can only have one primary key by definition. You may have multiple columns that are specified to make up the primary key. If your primary key has multiple columns look for the composite-id section of the Hibernate_reference.pdf file. It has an example of how to map that. dynoweb remember to rate

22. Getting Foreign key from another table - many-to-one forum.hibernate.org

Need help with Hibernate? Read this first: http://www.hibernate.org/ForumMailingli ... AskForHelp Hibernate version:3.1.3 Name and version of the database you are using: MySql 5 Hi, I have 2 tables: CREATE TABLE `Person` ( `Id` int(11) NOT NULL auto_increment, `name` varchar(11) default NULL, `phone` varchar(11) default NULL, `address_id` int(11) default NULL, PRIMARY KEY (`Id`), FOREIGN KEY (`address_id`) REFERENCES Addresses(`id`) ); CREATE TABLE `Addresses` ...

23. foreign key into non-hibernate table forum.hibernate.org

Hibernate version: 3.1.1 Name and version of the database you are using: Oracle 9iR2 I have a legacy database with many tables not normally accessed by Hibernate. I would like to generate a new Hibernate object that has fields/columns that are foreign-keys into some of these legacy tables, but I don't want to have to create Hibernate objects for these legacy ...

24. 3 tables, 2 with foreign keys to the third forum.hibernate.org

I have a general question involving 3 tables. An athlete table A coack table A person table Both athlete and coach should have foreign key references to the person table, that will contain data such as firstName, lastName etc. My thought was that I would have an AbstractPerson base class that would contain the firstName lastName information, and both person and ...

25. Updation failed :: in the table having no Primary key forum.hibernate.org

After begining the transaction for a particular session the Selection query is coming properly in hibernet. but incase of updation, when trying to commit the transaction instead of update query is not coming. We are able to fetch data but unable to update. From a public function we are calling three private functions. Each one of them having different functionalities but ...

26. two foreign keys to one table - problem forum.hibernate.org

a_sequence ...

27. Table with Multiple primary key forum.hibernate.org

28. Hibernate for tables without Primary key forum.hibernate.org

29. one-to-one where foreign-key is not foreign table's primary forum.hibernate.org

Nope, I just can't seem to figure this out! I think part of the problem is, sometimes with hibernate mappings it's tough to figure out the context of some of the mapping elements. For instance, why would I not be able to specify a *column* name for a reference in the foreign table? Like: I don't know, I'm ...

30. Retrieval Problem In Primary Key Table forum.hibernate.org

31. same primary key as foreign key in two table forum.hibernate.org

32. Reverse engineer tables with foreign (and no primary) key forum.hibernate.org

Indeed, that would be a solution, but not a very pretty one. I would introduce an artificial key, that is only there for Hibernate to get its unique identifier for every object, but has no value for the data in my database. In some way it's obfuscating my database design. I think, I am missing something important here. I am probably ...

33. Changing a Primary Key which other tables reference forum.hibernate.org

34. Problem with foreign key in same table forum.hibernate.org

Hi, I have a table "Attribute". Attributes can be of kind main, sub or single. Main and sub attributes should be in relation with each other. So I defined a mainAttribute which should be filled when it is a sub attribute. When I build my attribute set I assign the main attribute object to the mainAttribute member. When I try to ...

35. Creating table without primary key possible? forum.hibernate.org

If you ever want to insert or update this table, you must have a primary key. If you just want to select, you can get around it by using a native SQL portion in your code. For example: Code: String sql = ""; sql += ...

36. Table without Primary Key- Any Issues? forum.hibernate.org

Hi, Environment: Hibernate 3.2 JDK1.5 IDE -MyEclipse 6.5 We are trying to reverse engineering table which does not have primary key using MyEclipse IDE. But IDE is generating two DAO classes. One with ID.java and IDTableName.java. Like to know whether we proceed using these DAO classes. (I) If it is so, what are all changes need to be done for using ...

37. Hibernate - Table without primary keys forum.hibernate.org

38. Legacy table do not have primary Key forum.hibernate.org

Hi Folks, I am new to Hibernate. Tables that I have in the system does not have primary key. And it seems with the composite key concept, all the columns for the table would go in there :-(. So, it is a good idea to put everything goes in the composite key. In my application, the only operation is to pull ...