Hibernate many to one not updating The most popular xxx sites
In few articles, they even suggested that just forget about what is “inverse”, and always put inverse=”true” in the collection variable.
This statement is always true – “put inverse=true in collection variable”, but do not blindfold on it, try to understand the reason behind is essential to optimal your Hibernate performance.
Specifically, I want to focus on the One-to-Many relationship in Hibernate and how we go about mapping it out in our Java objects.
But before we do, a word on unidirectional and bidirectional relationships.
This is the key to mapping out a unidirectional relationship.
If we were to instantiate an instance of both of these objects we would be able to determine which method).
here no need to join column because with reference of model object you will get the list of test Details.
Just make sure in Test Details Many To One relationship is assign with Test Order.
JPA is an OBJECT relational mapping framework so the data model should be object based and not be bound to the relational data model.
JDBC4Prepared [email protected]: insert into user_roles (role, email) values ('ADMIN_ROLE', 8)] hibernate assumes that the relation is mapped based on the primary keys, hence it tries to insert the primary key value (8) of the user into the specified column (email). Just use When saveing something ensure to not create the same user role more than once.
So if you wana give an user the same role read it from the database first. You probably will create valid user roles before creating an user or update it afterwards.
The other data (not a list) is updated completely fine.
Here i get the class object from the database, modify that and pass the object to @Raffaele Rossi sir just now i changed the list data rather creating a new list or adding a new list object, and hibernate deletes and updates them accordingly but when i add a new list or create a new object it repeats the same old story. I notice this is a bit old now, but FWIW, the other answer is right, you shouldn't ever set a new collection on a persistent entity retrieved by hibernate as this will create orphans as it has in your case.
In the past we have learned about database relationships, specifically the One-to-Many as well as the Many-to-Many and One-to-One and that was all good, great and grand…