Hibernate annotation Map Inheritance Relationships

Database tables

Users table (user)

Id

Username

Password

Customer table, Customer table ID Reference user table ID

Id

Phone

Employee table (employee), Worker table ID Reference user table ID

Id

Qq

Aircraft Watch (Plane), aircraft includes passenger aircraft and fighter jets, passenger aircraft with toilets, fighters armed

Id

Type

Speed

Wc_position

Weapon_position

Entity Mappings

Sub-class shared properties id,version@mappedsuperclasspublic abstract class identifiedentity implements  serializable {@Id @generatedvalue@getter private long id; @Version @getter private  Int version;private void setid (Long id)  { this.id = id; }private  void setversion (int version)  { this.version = version; }}//  The ID of the User is defined in the parent class identifiedentity @entitypublic class user extends identifiedentity {@ getter  @Setter  private String username; @Getter   @Setter  private String  password;}   customer,employee is the subclass of user//   their ID is both a primary key and a foreign key//   Their primary key refers to the primary key @entity@primarykeyjoincolumn (name =  "id") of the user table as a foreign key public class customer  extends user {     @Getter   @Setter  private string phone;} @Entity @primarykeyjoincolumn (NAME =  " ID ") public class employee extends user {     @Getter   @Setter  PRIVATE STRING QQ;}  plane is the parent class of A370 and J10 @entity@inheritance (strategy=inheritancetype.single_table) @DiscriminatorColumn (name= " Type ",  discriminatortype=discriminatortype.string) public class plane extends  Identifiedentity{    private string speed;} @Entity @discriminatorvalue ("370") public class a370 extends plane{     Private string wc_position;} @Entity @discriminatorvalue ("738") public class j10 extends plane{     Private string weapon_position;}

Hibernate annotation Map Inheritance Relationships