Hibernate component mapping

A Component is a containted object that is be persisted value type and not an entity.But you can embed the component to entity.

Now We need one-to-one association for husband an wife. We just let the in one table. Then we create one entity, on component.

such as this:

Entity Husband:

 @Entity
 public class Husband {
     private int id;
     private String name;
     private Wife wife;
     @Id
     @GeneratedValue
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     @Embedded
     public Wife getWife() {
         return wife;
     }
     public void setWife(Wife wife) {
         this.wife = wife;
     }
 }

Component Wife:

 public class Wife {
     private String wifeName;
     private int wifeAge;
     public String getWifeName() {
         return wifeName;
     }
     public void setWifeName(String wifeName) {
         this.wifeName = wifeName;
     }
     public int getWifeAge() {
         return wifeAge;
     }
     public void setWifeAge(int wifeAge) {
         this.wifeAge = wifeAge;
     }
 }

We embed the component wife in entity Husband by @Embedded, So we get only one table named Hunband:

     create table Husband (
         id integer not null auto_increment,
         name varchar(255),
         wifeAge integer not null,
         wifeName varchar(255),
         primary key (id)
     )

So, Use component can make our program structual more clear in logic.