Adding/removing many-to-many associations with intersection tables

Question

Hello,
I am using Jdeveloper 11g with ADFBC.
I have some many to many associations in my application. For example User and Category are associated and there is an intersection entity (UserCategory - Columns are UserId, CategoryId) to save these associations.
What is the correct method for adding or removing categories assigned to user?
Thanks.
Edited by: Deniz Gulmez on 01-Nov-2009 03:25

Answer 1

I found an example for Jdeveloper 10g, which is discussed [ADF] Adding/deleting entries in a many-to-many relationship
In that example, many-to-many association is defined as two 1-to-many associations. Actually i've been searching since last week for an example which is made with many-to-many associations but no help. I will change my Model structure if it is not an efficient way to define many-to-many associations with intersection tables.
I wonder if it is possible to write some methods like :
addCategoryToUser(String userId, String categoryId)
removeCategoryToUser(String userId, String categoryId)
addCategories(String userId, List categoryIds)
vs.
Of course i am able to do these by creating a new Row in UserCategoryView (Intersection view), setting it's attributes and saving. Or the opposite, finding the row in intersection table and deleting it.
For example:
public void removeCategoryFromUser(String userId, String categoryId){
ViewObjectImpl vo = this.getUserCategories1();
vo.setWhereClause("USER_ID = :userId AND CATEGORY_ID = :categoryId");
vo.defineNamedWhereClauseParam("userId", null, null);
vo.defineNamedWhereClauseParam("categoryId", null, null);
vo.setNamedWhereClauseParam("userId", userId);
vo.setNamedWhereClauseParam("categoryId", categoryId);
vo.executeQuery();
Row row = vo.first();
row.remove();
I wonder if there is a more efficient way. Any samples would be appreciated.
Edited by: Deniz Gulmez on 01-Nov-2009 05:49