Outer Join « Fetch « JPA Q&A

1. Questions about Outer join fetching forum.hibernate.org

Hi, Could u be a bit more specific about when u expect the "Outer join fetching" to work?? The outer join fetch, as you might be knowing,is primarily aimed at enabling "eager initialization" of all the relevant objects in a Single SQL select. NB: The eager initialization would happen if a fetch clause is used,even when the loading mechanism of the ...

2. Outer join fetching for interface based queries. forum.hibernate.org

I appreciate hibernate's ability to query an interface. I would like to request a feature in the name of performance on these types of queries. In some object hierarchies, querying an interface can be quite exhaustive because hibernate performs a separate SQL query for every single class that implements the interface. In a current project, for example, hibernate is generating about ...

3. outer join fetching for one-to-many association forum.hibernate.org

Hello, I have a one-to-many association in one of my entities, which is marked as lazy-"false" and outer-join="true". If I do a session.load() on the entity, I see an outer join SQL statement being executed in the log. However, if I do a query like "select e from Entity e", there is no outer join. Instead, a separate SQL statement is ...

4. Problem with lazy fetching (left outer join) forum.hibernate.org

Newbie Joined: Tue Apr 12, 2005 11:25 am Posts: 2 Hi, I'm learning hibernate because I need it for a project in my work. I have the next problem. Currently in my work we have a database in oracle 9 and they asked me to progam a persistence layer using hibernate. I made some tests before and I ran into this: ...

5. What's the "Outer Join Fetching" & "ANSI& forum.hibernate.org

3.5.2. Outer Join Fetching If your database supports ANSI or Oracle style outer joins, outer join fetching might increase performance by limiting the number of round trips to and from the database (at the cost of possibly more work performed by the database itself). Outer join fetching allows a graph of objects connected by many-to-one, one-to-many or one-to-one associations to be ...

6. Outer Join fetching problem forum.hibernate.org

Beginner Joined: Wed Aug 04, 2004 4:33 am Posts: 45 Location: Switzerland Hibernate version:2.1.8 Mapping documents: - - - - -

10. left outer join fetch & where problem forum.hibernate.org

try this from trees t left outer join t.fruits as fr where fr.weight=10 and in mapping of trees.hbm.xml add this line : and in Trees.java add private Fruits fruits; with its getter and setter. you can put select clause also with its condition. [rate, if helpful] Thanks, Gopal

11. problem in outer join fetching forum.hibernate.org

Hi , I have 3 tables. LKUP , TKT_QST_ACTN and TKT. TKT_QST_ACTN have foreign key reference of LKUP through LKUP_ID. and TKT_QST_ACTN have also foreign key reference of TKT through TKT_NO Now I have to retrieve all the tktQstActn objects for a particular ticket number by joining lkup on lkup.typ. It is possible that TKT_QST_ACTN dont have all the reference of ...

12. Eager-fetching multiple sets without outer join forum.hibernate.org

Newbie Joined: Mon May 19, 2008 12:42 am Posts: 10 Hi, I have a Product entity which has two s simpleProductAttributes and complexProductAttributes. They need to be fetched eagerly when a Product is queried ; ie the output should be List each item having the simple and complex attributes populated. Reading abt eager fetch strategies, i see that it's suggested we ...