英文:
Bind two Entity without intermediate Entity spring data jpa
问题
我有一个用户表（和实体）
create table users(
id number(9) not null,
alias varchar2(200 char),
name_en varchar2(200 char),
state varchar2(1) not null
);
以及用户组
create table user_groups(
group_id number(9) not null,
alias varchar2(200) not null,
name_en varchar2(200 char),
state varchar2(1) not null,
constraint user_groups1 primary key (group_id)
);
组用户存储在绑定表中
create table user_group_binds(
group_id number(9) not null,
user_id number(9) not null,
constraint user_group_binds1 foreign key (group_id) references user_groups(group_id),
constraint user_group_binds2 foreign key (user_id) references users(id)
);
我想要在我的组实体中拥有用户实体的列表（不包括绑定实体）。有任何想法吗？
当然，我可以使用@Query注释，但我有其他与组映射的实体，它们将自动获取组实体。
我可以覆盖自动生成的方法吗？
英文:
I have a user table(and entity)
create table users(
id number(9) not null,
alias varchar2(200 char),
name_en varchar2(200 char),
state varchar2(1) not null
);
and user groups
create table user_groups(
group_id number(9) not null,
alias varchar2(200) not null,
name_en varchar2(200 char),
state varchar2(1) not null,
constraint user_groups1 primary key (group_id)
);
group users are stored in bind table
create table user_group_binds(
group_id number(9) not null,
user_id number(9) not null,
constraint user_group_binds1 foreign key (group_id) references user_groups(group_id),
constraint user_group_binds2 foreign key (user_id) references users(id)
);
I want to have in my group entity list of userEntity(without bind entity). Any ideas?
Of course, I can use @Query annotation, but I have other entities who mapped with group and they will automatic get group entity.
Can I override automatical methods?
答案1
得分: 1
您可以使用 @JoinTable 并在 UserGroup 实体中定义与联接表的列映射。
@OneToMany(cascade = CascadeType.ALL)
@JoinTable(name = "user_group_binds",
joinColumns = {@JoinColumn(name = "group_id", referencedColumnName = "group_id")},
inverseJoinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")})
List<UserEntity> users;
英文:
You can use @JoinTable and define column mapping with join table in UserGroup Enitity
@OneToMany(cascade = CascadeType.ALL)
@JoinTable(name = "user_group_binds",
joinColumns = {@JoinColumn(name = "group_id", referencedColumnName = "group_id")},
inverseJoinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")})
List<UserEntity> users;
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