join « Data Type « JPA Q&A

1. UserType join in Hibernate stackoverflow.com

Is it possible to make hibernate do "the right thing" for some value of "right" in this situation?

from ClassA a, ClassB b
where a.prop = b.prop

The thing is that prop is a ...

2. JPA/Hibernate maximum number of joins? stackoverflow.com

Is there a limit to the number of joins permitted in a JPA/Hibernate query? Since Hibernate doesn't automatically join, I have to explicitly specify the joins in my JPA/Hibernate query. ...

3. JPA join column with null values stackoverflow.com

I have a query that works in plain SQL but is not working on JPA and can't figure out why. As you can guess from the title I have a clue ...

4. CheckNullability of PrimaryKeyJoinColumn stackoverflow.com

I have a Entity class that has the ObjectX attribute:

@OneToOne(fetch = FetchType.LAZY)
@PrimaryKeyJoinColumn
public ClassOfObjectX getObjectX() {
return this.ObjectX;
}

This ObjectX can´t be null? In Hibernate 3.4 I could save this object in the repository ...

5. Can you specify date-based partition keys when joining to related entities? stackoverflow.com

I have two related entities being mapped by JPA annotations backed by hibernate. The entities both have sequence-backed identity columns in oracle. Our also have monthly partitions, represented by ...

6. determine join columns when copying hibernate object forum.hibernate.org

I'm working on a data versioning solution for hibernate. When I'm creating a new version of an existing object, I first copy all the information from the original object. For this I traverse the ClassMetadata information and copy the values using getPropertyValue and setPropertyValue. When creating a new entry for any existing associations in join tables, I need to know which ...

7. What is the equivalent of an SQL join subselect? forum.hibernate.org

select pr.personid, pr.name, length(pr.number) from Person pr where length(pr.number) = ( select max(length(p.number)) from Person ...

8. Criteria creates multiple time table joins forum.hibernate.org

Hi, I have Department table consists of list of employees associated in it. When i join employee through department entity, hibernate criteria creates query which contains two departments alias part of from clause. Why it so? It may lead to performance issue. Any help to avoid this is much appreciated. Thanks, Gopi Code: Criteria ===== Session session = ((HibernateEntityManagerFactory)entityManagerFactory).getSessionFactory().openSession(); ...

9. limit number of joins for use with mysql? forum.hibernate.org

Perhaps i have to change the subject to "stupid subclass question" now but i didn't get it yet. We use XDoclet to generate the mapping documents. It worked fine with version 2.0.1 but version 2.1 doesn't accept the subclass-mappings: Code:

10. Unexpected number of SQL statements on left outer join forum.hibernate.org

Author Message jbax Post subject: Unexpected number of SQL statements on left outer join Posted: Mon Apr 05, 2004 10:33 am Newbie Joined: Mon Apr 05, 2004 9:51 am Posts: 3 Hello, I am using Hibernate 2.1 with j2sdk1.4.2_02 atop of Oracle 9i. Everything is working as advertised however I am having trouble performance tuning (reducing the number of ...

11. left join / on / is null forum.hibernate.org

12. null foreign key and outer join forum.hibernate.org

Hibernate version: Hibernate 2.1.4 Mapping documents: Note I removed properties not needed for my question! S780_ATTIVITA

13. Coding the equivalent of an SQL Exception Join forum.hibernate.org

Hibernate version 2.1.7 I have two objects, and Application and a Queue An Application can be on a Queue (i.e. an Application object has an instance of Queue on it), or not (the Queue is null on it). I have a mapping files that link Queue to Application and vice versa I want to do a hibernate query that counts how ...

14. Use as join table? (or the burning time ma forum.hibernate.org

Hello. Is this possible to use a instead of a real table or view to make a many-to-many association ? I have to map a many-to-many association between two tables, but there is no join table. This association is based on a tricky interval system. The database schema is actually something like 15 years old and cannot be changed. And ...

15. tough time w/ "one-to-one" and "join" forum.hibernate.org

Beginner Joined: Thu Sep 08, 2005 9:24 pm Posts: 20 Location: Boise Idaho I've read through the documentation but I'm having a tough time understanding the concepts of how to join tables & persist objects when it comes to related tables. I have a very good understanding of relational databases & table relationships and I understand associations between business objects...it's Hibernate's ...

16. using join table but can't get date from join table forum.hibernate.org

Newbie Joined: Sat Nov 19, 2005 7:34 pm Posts: 4 How can I populate the date field from the join table in address.java object ?? I am using 3 tables (from hib examples , b/c if i can get this to work my real problem on my project will be solved) person address personaddress the join table just has three fields ...

17. NULL references in joined table forum.hibernate.org

I have a class AbstractPerson which joins two tables, PERSON and PERSON_APP_RELATIONSHIP. In PERSON_APP_RELATIONSHIP are references to other AbstractPersons: mother, father, husband, wife. I would prefer to keep those references in the PERSON table and not do a join but I do not have a choice to do this. The class AbstractPerson looks like this: Code: public class AbstractPerson implements Person ...

18. Casting HQL Joins forum.hibernate.org

I'm having trouble understanding HQL joins. How do I cast this query to my two objects? from com.xxxx.xxxx.Lead l inner join l.leadDatas as ld where (l.lname = :leadQuery or ld.leadDataId = :leadQuery) The two objects are Lead, and LeadData. There is a getLeadDatas in Lead which return a list of LeadData. There is a one to many mapping in lead to ...

19. Criteria equivalent for HQL extra join condition syntax forum.hibernate.org

20. UserType in join forum.hibernate.org

Hibernate version: 5.045 Mapping documents: ... Code between sessionFactory.openSession() and session.close(): StringBuilder queryStr = new StringBuilder(); // The below HQL returns the CallQDetails object and also the operator Object String currentDate = ...

21. Criteria equivalent of HQL join "With" Keyword forum.hibernate.org

Hi, I need to use the equivalent on the HQL "With" keyword in the criteria API but I don't know how to do it. The query I need to recreate is similar to the example from Cat as cat left join cat.kittens as kitten with kitten.bodyWeight > 10.0 But I need the criteria api to build some dynamic where conditions. Any ...

22. left outer join when null value is used in where forum.hibernate.org

i have a BIG problem =( first i had a query with join, but my values could be null so my query didn't retrieve results with null value, so i changed it for a left outer join and it works, but now when i try to use the object rp in the where query's part it doesn't work T_T take a ...

23. JPA - Join Tables with Effective Dates forum.hibernate.org

Hello everyone, I have been fighting with defining a class with effective dates as part of the join table and just cannot figure out how to make it work. I have search all over the net for clues, but have yet to find anything such like this. If anyone has experience with this, I would really love to hear your thoughts. ...

24. Outer join with literal string forum.hibernate.org

25. Hibernate ouer join with string literal forum.hibernate.org

Hi All, Is it possibe to implement the outer join with string literal ? I have no permission to use session.createSqlQuery() I will have to use HQL using session.createQuery(). I want to implement the following SQL in hibernate. SQL :: select from tableA a, tableB b where a.id = b.id (+) a.name = b.name (+) a.address (+) not in ...

26. Hibernate ouer join with string literal forum.hibernate.org

27. Hibernate ouer join with string literal forum.hibernate.org

28. Joining on different data type columns. Please stop laughing forum.hibernate.org

29. Annotations - Simple join a string from another table? forum.hibernate.org

I'm trying to get a simple many-to-one relationship working with annotation based Hibernate objects, however I don't want to create another entity for the joined value as all I need to retrieve is a string. As a simple example, I have a table with name titles in it (Mr, Mrs, etc) [id, label], and I have a table with people in ...