System learning Hibernate Five: one-to-one foreign Key Association

A one-to-one foreign key association in hibernate is similar to a Many-to-many foreign key association,

Hibernate a foreign Key association first refer to this, and then just add the following code to the *.hbm.xml:

<many-to-one name= "group" column= "GroupID" unique= "true"/>,

is to add the unique= "true" attribute.

Add the following code to the *.hbm.xml in a multiple foreign Key association: <many-to-one name= "group" column= "GroupID"/>.

PS: The other configuration is the same as the multiple to one foreign key association, except for the *.hbm.xml inside the multiple end of the unique= "true" attribute in the configuration file, the other is the same.