subselect « Fetch « JPA Q&A





1. How do you programmatically turn off eager fetching with hibernate?    stackoverflow.com

I have in my mapping an association to an eagerly loaded collection (lazy="false" fetch="subselect"). How can I turn that off programmatically with Hibernate when I do a query? Thanks

2. fetch="subselect" and fetch="join" not working as expected with HQL    coderanch.com

I have a contact and address entities where contact has 1-to-many relationship with address I am trying to fetch all the addresses for all contacts in minimum sqls. I read the chapter 13(optimizing fetching and caching) of Java persistence with hibernate. It specifies 3 possible solutions: 1. Using batch-size 2. Using fetch="subselect" 3. Using fetch = "join" Below is my java ...

3. Subselect fetch and query named parameters problem    forum.hibernate.org

Hi! I'm trying to use subselect fetching for one-to-many collections. It works fine for loading single objects. But if I trying to use object with subselect fetch collection in query with named parameters, collection loading fails with rror "org.hibernate.util.JDBCExceptionReporter - Parameter #1 has not been set." Detailed information: I'm using Hibernate 3.0.5 Mapping document: Code:

4. Subselect fetch returns incorrect result.    forum.hibernate.org

5. Using subselect fetch in hql queries    forum.hibernate.org

Hibernate version: 3.0.5 Hi, My entity has an association that I wish to be lazy as default, so in the mapping file no eager fetching is set for this association. But, I have a query (using HQL) that wants to load everything and I want to specify eager fetching for that query only. Join wont help me much, since the association ...

6. Why does Subselect Fetching not work as advertised.    forum.hibernate.org

I tried to enable subselect fetching on a many-to-one association and got this message: org.hibernate.AnnotationException: Use of FetchMode.SUBSELECT not allowed on ToOne associations The documentation, however states that: 19.1.6. Using subselect fetching If one lazy collection or single-valued proxy has to be fetched, Hibernate loads all of them, re-running the original query in a subselect. This works in the same way ...

7. How to do fetch="subselect" in HQL or Criteria?    forum.hibernate.org

I have one object (Point) with two one-to-many relationships. When I set lazy="false" for both relationships as below Code: and then run this HQL query ("from Point as p") to select all points ...

8. subselect fetch for many-to-many    forum.hibernate.org

I have such mapping: ... but when I have loaded some StructuralConstraints and try to get typeReferences for all of them I see that there are many queries: Hibernate: select typerefere0_.id as id3_, typerefere0_.elt as elt3_, placementt1_.`id` as id1_50_0_, placementt1_.e_version as e3_50_0_, placementt1_.`name` as name4_50_0_, ...

9. Criteria query using subselect fetch method    forum.hibernate.org

Dear users, I would like to use subselect fetch mode to avoid a cartesian product during a Criteria query. I read informations about this problem in the "Java Persistence with Hibernate" book and I first thought i found the solution on page 588 (The cartesian product problem) but it finally seems it does not work as expected. I'm trying to fetch ...





10. How does exactly subselect fetching work? Help!No doc found!    forum.hibernate.org

Hi, What is the exact algorithm for fetch=subselect? I searched through the manual and javadoc but the explanations are quite vague. I have a "Node.translations" one-to-many relationship defined with fetch=subselect. i fetch a lot of nodes in one session using a lot of Restrictions.in(id,nodeIds) criterias. When I then access the relation "Node.translations" on one of the nodes for the first time ...

11. Fetch Join / SUBSELECT doesn't work    forum.hibernate.org

12. Subselect when fetching parallel collections    forum.hibernate.org

Hibernate version: Hibernate for EJB3, on JBoss, with SQL Server. I'm facing a problem similar to that in the JPWH book (page 588-589): our "User" entity retrieves several collections in a many-to-many relationship, and as a result we're getting multiple left outer joins, i.e. a Cartesian product. The book suggests using a subselect strategy, but I've not been able to make ...