JPA 映射多向多对1的关联关系

 Order 类

private Integer id;

private String orderName;

private Customer customer;

// 映射单向n-1的关联关系

// @ManyToOne映射多对一关联关系，@JoinColumn来映射外键

@JoinColumn(name="CUSTOMER_ID")

@ManyToOne

public Customer getCustomer() {

return customer;

}

Customer类

private Integer id;

private String lastName;

private String email;

private int age;

private Date createdTime;

private Date birth;

private Set<Order> orders=new HashSet<Order>();

//@OneToMany映射1-n的关联关系

//@JoinColumn映射外键列

//cascade={CascadeType.REMOVE}设置级联删除

//@JoinColumn(name="CUSTOMER_ID")

@OneToMany(cascade={CascadeType.REMOVE},mappedBy="customer")

public Set<Order> getOrders() {

return orders;

}