OntToOne
<!--Person类-->
@Entity
@Table(name="person")
public class Person {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long id;
private String name;
@OneToOne(targetEntity=Card.class,mappedBy="person")
private Card card;
《!--Card类--》
@Entity
@Table(name="card")
public class Card {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long cid;
private String cname;
@ManyToOne(targetEntity=Person.class)
@JoinColumn(name="id",unique=true)
@Cascade(value={CascadeType.SAVE_UPDATE})
private Person person;
OneToMany
<!--user类-->
@Entity
@Table(name="tb_user")
public class User {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long uid;
private String name;
@OneToMany(targetEntity=Order2.class)
@JoinColumn(name="uid")
@Cascade(CascadeType.SAVE_UPDATE)
private Set<Order2> set = new HashSet<>();
<!--Order类-->
@Entity
@Table(name="tb_order")
public class Order2 {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long Oid;
private String name;
@ManyToOne(targetEntity=User.class)
@JoinColumn(name="uid")
@Cascade(CascadeType.SAVE_UPDATE)
private User user;
ManyToMany
<!--Student类-->
@Entity
@Table(name="tb_student")
public class Student {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long sid;
private String name;
@ManyToMany(targetEntity=Teacher.class)
@JoinTable(name="tb_tea_stu",joinColumns={@JoinColumn(name="sid")},inverseJoinColumns={@JoinColumn(name="tid")})
@Cascade(CascadeType.SAVE_UPDATE)
private Set<Teacher> Teacherset = new HashSet<>();
<!--Teacher类-->
@Entity
@Table(name="tb_treacher")
public class Teacher {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long tid;
private String name;
@ManyToMany(targetEntity=Student.class)
@JoinTable(name="tb_tea_stu",joinColumns={@JoinColumn(name="tid")},inverseJoinColumns={@JoinColumn(name="sid")})
@Cascade(CascadeType.SAVE_UPDATE)
private Set<Student> studentset = new HashSet<>();