JPA映射关系实体parentID [英] JPA map relation entity parentID

问题描述

有人可以帮助我了解如何通过JPA映射定义一个与自身有关系的实体吗?

could someone help me to understand how can I define an entity with JPA mapping that has a relation with it self?

例如，我的实体是CompanyDivision，部门A包含部门B，部门C 而DivisionB包含DivisionB1，DivisionB2

For example, my entity is CompanyDivision, divisionA contains divisionB, divisionC and divisionB contains divisionB1, divisionB2

• 部门
  • 部门B
    • divisionB1
    • divisionB2
    • divisionA
      • divisionB
        • divisionB1
        • divisionB2

        谢谢！

        推荐答案

        与2个不同实体之间的关系没有什么不同.这是一个示例:

        It's not different from a relation between 2 different Entities. Here's an example:

        class CompanyDivision {
        
            @OneToMany(mappedBy = "parentDivision")
            private Set<CompanyDivision> childDivisions = new HashSet<CompanyDivision>();
        
            @ManyToOne
            @JoinColumn(name = "FK_PARENT_DIVISION")
            private CompanyDivision parentDivision;
        }
        

        这篇关于JPA映射关系实体parentID的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！