休眠：連接表連接表的註釋

Question

如何創建下列情況下的註釋：

Table A 
id 
name 

Table B 
id 
name 

Table C 
id 
name 

Table AB 
a_id 
b_id 

Table ABC 
id 
a_id 
b_id 
c_id 
name 

你怎麼能使用註解休眠代表表ABC？

表AB是不是被用作表的對象表A和B.

爲A和B的註釋之間的連接會看起來像這樣：

用於：

@OneToMany(cascade=CascadeType.ALL) 
@JoinTable(name="AB", 
joinColumns={@JoinColumn(name="a_id", referencedColumnName="id")}, 
inverseJoinColumns={@JoinColumn(name="b_id", referencedColumnName="id")}) 
private Set bs; 

對於B：

@OneToMany(cascade=CascadeType.ALL) 
@JoinTable(name="AB", 
joinColumns={@JoinColumn(name="b_id", referencedColumnName="id")}, 
inverseJoinColumns={@JoinColumn(name="a_id", referencedColumnName="id")}) 
private Set as; 

由於提前。

Answer 1

我會做這樣的事情：

答：

@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, fetch = FetchType.LAZY) 
@JoinTable(name = "AB", joinColumns = @JoinColumn(name = "A_ID", 
     referencedColumnName = "ID"), inverseJoinColumns = @JoinColumn(name = "B_ID", 
     referencedColumnName = "ID")) 
private List<B> bs; 

同爲B.

ABC：

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "A_ID") 
private A a; 

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "B_ID") 
private B b; 

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "C_ID") 
private C c;