Hibernate Tutorial 13 - One To One Mapping

One to one mapping of entities.

[ujjvalsharma]

Hi This is the best Hbernate/JPA tutorial out there. Hats off man!! keep up the good work

[shivangigupta]

You can use ctrl+Shift+O for importing all the respective classes.

[noshortcutforsuccess]

Thanks alot for all your videos for Hibernate and Spring. It helped me alot.

[emreverim]

if anyone gets the error which is " Exception in thread "main" Unknown column 'vehicle_vehicleId' in 'field list' ", the solution is you should change property name="hbm2ddl.auto" from create to update .

[knrd]

many people seem to have problems, consider dropping all tables manually, and use following annotation instead of just @OneToOne

[jayanthbabu]

Hi,

How to create 2 separate sequence ID, both the user id and the vehicle id gets their next val using  the same sequence... ?

[SuperNunien]

Is the session.save(vehicle) is stille needed after you added @OneToOne ?

[tipu]

Hello Koushik, in the example here, there is a possibility that one car can be owned by many user since, vehicle_id is FK (and not unique) in the user_detail table.

[arunp]

hey ! all of your videos are awesome...very thanks :)

[wenhoujx]

if you have been following the tutorial, you have other tables depend on user_details, so when hibernate tries to delete user_details, it cannot, but it doesn't report the error either. so you ended up with an old user_details table with no vehicle_id column. Try to manually drop all your tables, try to drop user_details table first and you will see what I am talking about.

[Sagittarius]

 I get following ERROR: "Could not determine type for: com.mydomain.hibernate.dto.Vehicle, at table: USER_DETAILS, for columns:

[rohansharma]

Please use @OneToOne(cascade = {CascadeType.ALL})
above declaring the Vehicle in Users class.

[starun]

Some options to try:
 Specify the @Table annotation and give it a name of Vehicle OR
 Change the hbm2ddl.auto to "update"

[errrzarrr]

I have a Question: Don't you need @OneToOne in Vehicle entity too? If I am looking at it the correct way, ifa user puts a repeated vehicle ID into User_details table it will become a "Many To One" Relationship. Is it the other way around?

[LikeYouC]

If we try this in HibernateTest class:

UserDetails user = new UserDetails();
user.setUserName("First User");

UserDetails user2 = new UserDetails();
user2.setUserName("Second User");

Vehicle vehicle = new Vehicle();


user.setVehicle(vehicle);
user2.setVehicle(vehicle);

It will add both users in the table User_Details and both of them will have VEHICLE_ID = 1. But it shouldn't be possible in One-To-One relationship: Only one user can be connected with only one vehicle, and only one vehicle can be connected with only one user. Right?

[wombstrat]

Hi your videos are great, but i have a question:
When i do the Reverse Engineer in MySQL (Workbench), the diagram shows me a relationship OnetoMany; why?
I really do all the things in the video :D

[mdc]

I'm getting the following error: Caused by Unknown column 'vehicle_vehicleId' in 'field list'! Can someone help me out?

[despotjc]

if you have an error then use this annotation after @ID ;
@GeneratedValue(strategy = GenerationType.IDENTITY)

[Oprofs]

i have same problem also create property in the xml configuration file appear to be not working it act like upgrade

[recoveringheart]

So far I have been following everything you've done and successfully did it myself as well. But the code for this video gives me the following error? Can you please help?
Exception in thread "main" Unknown column 'vehicle_vehicleId' in 'field list'