未在mysql中创建Spring JPA外键

我不熟悉春天和冬眠。创建表时，没有创建外键。有人能帮忙吗

这里是我的实体。 使用者

当我运行应用程序时，表被创建，但是，没有创建外键。 hibernate生成的SQL是：

drop table if exists application_user;
drop table if exists application_user_roles;
drop table if exists hibernate_sequence;
drop table if exists roles;

create table application_user (
    id integer not null, 
    city varchar(20), 
    county varchar(20), 
    email varchar(60), 
    house_number integer not null, 
    password varchar(100),
    postcode varchar(9), 
    street varchar(40), 
    tele_phone varchar(13), 
    user_name varchar(40), 
    primary key (id)
) ;    

create table application_user_roles (
    application_user_id integer not null, 
    roles_id integer not null
) ;    

create table hibernate_sequence (next_val bigint); 
insert into hibernate_sequence values ( 1 );
insert into hibernate_sequence values ( 1 );

create table roles (
    id integer not null, 
    name varchar(255), 
    primary key (id)
);

alter table application_user_roles add constraint UK_bn9l8a2gm8lytmn3c2cnbxrxm unique (roles_id);
alter table application_user_roles add constraint FK13sbcqjpwynfdukkr8i1xfyj1 
foreign key (roles_id) references roles (id);
alter table application_user_roles add constraint FK9hwva08h4u671cqxpexx1dx7i 
foreign key (application_user_id) references application_user (id)

当我查看MySql工作台中的表时，没有外键约束。但是如果我在查询窗口中运行SQL脚本，就会创建外键约束。为什么hibernate创建表时不创建外键？我试过两台MySql服务器，结果都是一样的

---

有人有什么想法吗？

你有为

应用程序\用户\角色创建的实体吗

表？没有，我没有这个实体。Hibernate自动生成链接表。我不理解的是Hibernate生成的SQL是正确的，应该在数据库中生成正确的表。事实并非如此。

Imports.......

@Entity
@Table(name="roles")
public class Roles {

@Id
@GeneratedValue
public Integer id;  
public String name;

Setters and getters.......

drop table if exists application_user;
drop table if exists application_user_roles;
drop table if exists hibernate_sequence;
drop table if exists roles;

create table application_user (
    id integer not null, 
    city varchar(20), 
    county varchar(20), 
    email varchar(60), 
    house_number integer not null, 
    password varchar(100),
    postcode varchar(9), 
    street varchar(40), 
    tele_phone varchar(13), 
    user_name varchar(40), 
    primary key (id)
) ;    

create table application_user_roles (
    application_user_id integer not null, 
    roles_id integer not null
) ;    

create table hibernate_sequence (next_val bigint); 
insert into hibernate_sequence values ( 1 );
insert into hibernate_sequence values ( 1 );

create table roles (
    id integer not null, 
    name varchar(255), 
    primary key (id)
);

alter table application_user_roles add constraint UK_bn9l8a2gm8lytmn3c2cnbxrxm unique (roles_id);
alter table application_user_roles add constraint FK13sbcqjpwynfdukkr8i1xfyj1 
foreign key (roles_id) references roles (id);
alter table application_user_roles add constraint FK9hwva08h4u671cqxpexx1dx7i 
foreign key (application_user_id) references application_user (id)