collection « Composite « JPA Q&A





1. Need a collection within a composite element    forum.hibernate.org

I have a table setup such that I need: entity -> bag -> composite-element -> set The documentation very blandly states that you can't put a collection inside of a composite-element, but does not say what to do about it. I just need to store an array of simple values, I'm not trying to do anything that complicated! My join table ...

2. Mapping collection of elements with composite key    forum.hibernate.org

Hibernate version: 3.6.7.Final Hibernate annotations version: 3.2.0.Final I am trying to map classes over a pre-existing database that I cannot change. There is a parent table X and a child table Y. Y has a foreign key to X and another column that form a composite key. Classes look like this: Code: @Entity @Table(name = "X") public class X { ...

3. HQL against collection of composite elements    forum.hibernate.org

I'm having trouble working out how to write a query where I need to select against a value in a collection of composite elements. This is the mapping: Code: ...

4. HQL against collection of composite elements mto w/ 3rd tbl    forum.hibernate.org

i realize this is a little long, i've tried to reduce it to the simplist form... say i have tables Authors (Id, Name, ...) Books(AuthorId, LanguageId, ...) Languages(Id, LanguageName, Direction, ...) i want to create the following sql: select b.* from Authors a, Books b, Languages L where (a.Id = b.AuthorId) AND (b.LanguageId = L.Id) AND l.Direction = "left-to-right" using HSQL ...

5. M:M orphan in composite collection issue    forum.hibernate.org

We have a requirement for a class which can have many children of the same type. We map this composite-pattern type class as having a bag of children mapped as a many-to-many relationship: Code:

6. Accessing a property of a composite-element in a collection    forum.hibernate.org

I have a Session object which has a List of SessionAttribute objects. The SessionAttribute is mapped as a composite-element. How can I query all Session objects which have a SessionAttribute whose value property has a specific value? POJOs Code: public class Session { private long sessionId; private List attributes; private String name; ...

7. Mapping a composite-element collection with the primary key    forum.hibernate.org

I'm trying to get a composite-element mapped to a collection via a column that is not the primary key of the containing class. The containing class has the following fragment to grab the composite-elements. Code: ...

8. Repeated column in mapping for collection, composite-map-key    forum.hibernate.org

If CREDIT_REF_NUM is the key of the map, why are you trying to use it as the map-key, too? Change your mapping to have a non-composite map-key, with just FORM_ID. The key is used to determine ownership: all items in the DOC table with a give CREDIT_REF_NUM are owned by the CREDIT_APP with the same CREDIT_REF_NUM. The map-key is used to ...

9. Composite Key Collection Problems    forum.hibernate.org

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11. @hibernate.collection-composite-element    forum.hibernate.org

public class Process{ private List comments = new ArrayList(); /** * * @hibernate.list table="ENTITY_COMMENTS" * @hibernate.collection-composite-element class="Comment" * @hibernate.collection-index column="COMMENT_INDEX" */ public List getComments() { return comments; ...

12. Problem about update on collection of composite-element    forum.hibernate.org

Dear all, I have two tables. Table A and Table B has a one-to-many relationship. Each table A record can have several records in B, and table B itself has no primary key. Therefore i only defined mapping file for Table A and inside it there is a collection attribute like this: ...

13. Why uses a collection with composite-element only Maps?    forum.hibernate.org

Hello, Hibernate version: 3.2.5.ga I use a collection of dependent objects with : Code: ... ...

14. composite-element can't have a collection?    forum.hibernate.org

Hello, I'm new to this and wondering why a can't have a collection? But, a Component can have a collection right? I've tried to find an answer to this question by searching this forum and online but couldn't find one. Please do point me to the resource if this had already been answered. Thanks

15. Collection of composite keys - can't find correct syntax    forum.hibernate.org

Need help with Hibernate? Read this first: http://www.hibernate.org/ForumMailingli ... AskForHelp Hibernate Version 3.0.5 Hi Everyone, I am unable to find the correct HQL syntax for selecting all records based on a given collection of composite keys. My mapping files all seem to be fine, i believe the problem is with my HQL query. Would any of you please give it a ...

16. Mapping a collection with a composite key    forum.hibernate.org

I have a db table (Contacts) whose contents are refreshed with new/updated data periodically. The table has an ident primary key, but it is rather worthless to use as a foreign key because the keys change everytime the data is refreshed. (wipe and reinserted) For example, contact Joe Smith may have ID 7, but after a refresh could have ID 834678. ...