How to insert a record which has a forgien key using Hibernate?

Question

Dear all,
I have two Tables called User, Location. User has a foreign key "location_id" which is the primary key of Location.
The Location has already a record with location_id = 1.
Now I want to insert a new record to User table by Hibernate as follows:
Session session= this.getSession(); Location location = new Location(); location.setLocationId(new Long(1)); User user = new User(); user.setUserAccount("userAccount"); user.setFirstName("firstName"); user.setLastName("lastName"); user.setLocation(location); session.save(user);
The new record was inserted. But the column "location_id" is null (not 1 as I expected).
Could you tell me what is wrong?
Regards.
Pengyou

Answer 1

pengyou wrote:
Dear all,
I have two Tables called User, Location. User has a foreign key "location_id" which is the primary key of Location.
Is it mapped as 1:1? Is it bi-directional?
The Location has already a record with location_id = 1.
Now I want to insert a new record to User table by Hibernate as follows:
Session session= this.getSession();
Location location = new Location();
location.setLocationId(new Long(1));Hibernate sets that, not you.
User user = new User();
user.setUserAccount("userAccount");
user.setFirstName("firstName");
user.setLastName("lastName");
user.setLocation(location);
session.save(user);     
The new record was inserted. But the column "location_id" is null (not 1 as I expected).
Could you tell me what is wrong? Hard to tell without your mapping .hbm.xml. But you don't set the ID, Hibernate manages that.