@ManyMany已经不够用了，有没有@ManyManyMany

刚才白写了。
Book{id,name,isbn}
Author{id,name}
BookAuthor{id,bookid,authorid,type} //type: 0, 作者; 1,译者
@ManyMany已经不够用了，有没有@ManyManyMany呢？

wendal

1楼•2920天前

你在说神马??

xiciliu

2楼•2920天前

哈哈
2个类book,author。
在book中创建
@ManyMany(from = "bookid", relation = "BookAuthor", target = Author.class, to = "authorid")
List authors //此种情况，BookAuthor->type=0
以及
@ManyMany(from = "bookid", relation = "BookAuthor", target = Author.class, to = "authorid")
List translators //此种情况，BookAuthor->type=0
不能在ManyMany注解中指明type。
所以authors和translators是一样的了。

xiciliu

3楼•2920天前

@xiciliu(xiciliu)
List translators //此种情况，BookAuthor->type=0 这里应改为 type=1

xiciliu

4楼•2920天前

@ManyMany(from = "bookid", relation = "BookAuthor", target = Author.class, to = "authorid")
	private List<Author> authors;//此种情况，BookAuthor->type=0
	
	@ManyMany(from = "bookid", relation = "BookAuthor", target = Author.class, to = "authorid")
	private List<Author> translators;//此种情况，BookAuthor->type=0 这里应改为 type=1

wendal

5楼•2920天前

关联关系中需要多个列关联？

xiciliu

6楼•2920天前

对的。
在表BookAuthor中，同一个bookid,还需要区分type列，才能找到目标authorid。