Hibernate 单向多对多更新目标构成关系

Question

Role 和 Privilege 之间存在单向的 ManyToMany 映射，Role 作为拥有实体，就像这样

Role

@Entity
public class Role extends BaseEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "role_id")
    private Integer roleId;
    @Size(max = 45)
    @Column(name = "role")
    private String role;

    @JoinTable(name = "role_privilege", joinColumns = {
            @JoinColumn(name = "role_role_id", referencedColumnName = "role_id")}, inverseJoinColumns = {
            @JoinColumn(name = "privilege_privilege_id", referencedColumnName = "privilege_id")})
    @ManyToMany(
            cascade = {
                CascadeType.DETACH,
                CascadeType.MERGE,
                CascadeType.REFRESH,
                CascadeType.PERSIST }, fetch = FetchType.EAGER, targetEntity = Privilege.class)
    private Collection<Privilege> privilegeCollection;

    @Transient
    private Collection<Privilege> parentPrivilegeCollection;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "roleId")
    @JsonIgnore
    private Collection<User> userCollection;

    public Role() {
    }
    //getters,setter,hashcode,equals removed for brevity
}

Privilege

@Entity
public class Privilege extends BaseEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "privilege_id")
    private Integer privilegeId;
    @Size(max = 45)
    @Column(name = "name")
    private String name;
    @Size(max = 150)
    @Column(name = "description")
    private String description;
    @Size(max = 45)
    @Column(name = "friendly_name")
    private String friendlyName;
    @JoinTable(name = "privilege_hierachy", joinColumns = {
            @JoinColumn(name = "parent_privilege", referencedColumnName = "privilege_id")}, inverseJoinColumns = {
            @JoinColumn(name = "child_privilege", referencedColumnName = "privilege_id")})
    @ManyToMany
    private Collection<Privilege> privilegeCollection;

    public Privilege() {
    }
}

问题

每当我在角色中设置更新的权限列表并进行更新时，连接表都会成功更新，而不会删除目标或拥有实体，这是预期的结果。问题在于更新它还会影响Privilege 中名为privilege_hierachy 的另一个自连接表，这不是预期的。

hibernate是否可以只更新Role-Privilegemant-to-many关系，其他关系不变。

Spring Data Jpa 用于数据持久化

Answer 1

听起来您正在通过（删除旧特权和）添加新特权来更新特权。如果您这样做，显然，第二个连接表（自引用表）可以根据您传递的内容更新为新行。

我看到对于自引用表 Privilege，您没有设置级联类型。它默认为无操作，这听起来像你想要的。但我的猜测是基于您所说的“每当我在角色中设置更新的权限列表时”，这告诉我您正在为角色创建新权限，而不是使用现有权限并将它们关联与角色。