Hibernate component mapping

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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.