relationship « Field « JPA Q&A





1. JPA define relationship on a field that requires type conversion    stackoverflow.com

I want to join two tables on column "vendor", In invoice table vendor type is integer, in vendor table, vendor is type varchar(10). Is it possible to do a type conversion and ...

3. MAny to Many relationships using annotations with more field    forum.hibernate.org

My table structure is like this: USERS -> user_id , user_nm GROUP_MAP -> user_id, group_id , perm_id(this field is assign permission for user_id and grou_id combination) GROUPS -> group_id , group_nm The asscociation in my USERS.JAVA POJO is @ManyToMany(cascade = CascadeType.ALL) @ForeignKey(name = "FK_USER_ID", inverseName = "FK_GROUP_ID") @JoinTable(name = "GROUP_MAP", joinColumns = {@JoinColumn(name = "USER_ID")}, inverseJoinColumns = {@JoinColumn(name = "GROUP_ID")}) public ...

4. Saving relationship fields automatically    forum.hibernate.org

Hi, I'm evaluating hibernate and I have a question about relationships. In my tests I have an object (A) that has a 1 to many relationship with object B. When I save the object A I have to do a loop through the collection that has the relationship and save all objects B. Then I save object A. Is there a ...

5. Relationship field in database contains 0 instead of NULL    forum.hibernate.org

Need help with Hibernate? Read this first: http://www.hibernate.org/ForumMailingli ... AskForHelp Hibernate version: 3.1.1 Hibernate Annotations: 3.1beta8 I'm working with a legacy database that for some stupid reason sometimes uses zeroes in fields that link records to parents in the same table, where 0 actually means null (i.e. the record has no parent - there is no record with an id of ...