java - JPA映射: Reusing entities in multiple relationships

Question

假设我有:

class Unit {
    private TextContainer source;
    private List<TextContainer> targets;
}

我可以以在两种关系中都有效的方式注释 TextContainer 类吗？TextContainer 必须是源或目标。

Answer 1

您需要在Unit类中注释与TextContainer的关系。像这样的事情:

class Unit {

    @ManyToOne(cascade=CascadeType.ALL) 
    private TextContainer source;

    @OneToMany(cascade=CascadeType.ALL) 
    private List<TextContainer> targets;
}