通过休眠和注释自引用许多东西 [英] self referencing manytomany with hibernate and annotations

问题描述

  @ManyToMany（mappedBy =以下内容，cascade = CascadeType.ALL）
 private Set< User> followers = new HashSet< User>（）; 
 
 @ManyToMany（mappedBy =followers，cascade = CascadeType.ALL）
 private Set< User> following = new HashSet< User>（）; 
  

解决方案

类似于：

  @ManyToMany（mappedBy =following，cascade = CascadeType.ALL）
 @JoinTable（name =UserRel，
 joinColumns = {@JoinColumn（name =ParentId）}，
 inverseJoinColumns = {@ JoinColumn（name =UserId）}）
 private Set< User> followers = new HashSet< User>（）; 
 
 @ManyToMany（cascade = CascadeType.ALL）
 @JoinTable（name =UserRel，
 joinColumns = {@ JoinColumn（name =UserId）}，
 inverseJoinColumns = {@ JoinColumn（name =ParentId）}）
 private Set< User> following = new HashSet< User>（）; 
  

My brain is starting to hurt thinking about this, is it as simple as :

@ManyToMany(mappedBy = "following", cascade = CascadeType.ALL)
private Set<User> followers = new HashSet<User>();

@ManyToMany(mappedBy = "followers", cascade = CascadeType.ALL)
private Set<User> following = new HashSet<User>();

解决方案

Something like:

@ManyToMany(mappedBy = "following", cascade = CascadeType.ALL)
@JoinTable(name="UserRel", 
                joinColumns={@JoinColumn(name="ParentId")}, 
                inverseJoinColumns={@JoinColumn(name="UserId")})
private Set<User> followers = new HashSet<User>();

@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name="UserRel", 
                joinColumns={@JoinColumn(name="UserId")}, 
                inverseJoinColumns={@JoinColumn(name="ParentId")})
private Set<User> following = new HashSet<User>();

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