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外键我有两个实体:休眠插入从形式
1)
@Entity
@Table(name = "users")
public class User {
private String username;
private String password;
private String name;
private String surname;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "depId")
private Department department;
private boolean enabled;
private Set<UserRole> userRole = new HashSet<UserRole>(0);
private Set<Equipment> equipment = new HashSet<Equipment>();
2)
@Entity
@Table(name = "department")
public class Department {
private int depId;
private String name;
private String adress;
@OneToMany(fetch = FetchType.EAGER, mappedBy = "department")
private Set<User> user = new HashSet<User>();
我怎么能写HQL查询,将值接入到用户。不从其他表格。我在JSP表单中插入表单。我想从那些表单中添加值。 我的'删除'方法有问题。
在UserDAOImpl:
@Override
public User findByUserName(String username) {
return (User) getSession().get(User.class, username);
}
@Override
public void delete(String username) {
getSession().delete(findByUserName(username));
}
当我用这个方法,它删除的UserRole表处 '部门' 和 'USER_ROLE'。但我想只删除用户。
UPDATE
这个问题解决。但我有第二个问题。我有第二个实体,比如名为UserRole的Depatment。并有相同的方法。我需要的方法:
UserRoleDAOImpl:
@Override
public Set<UserRole> findByRole (Set<UserRole> userRole){
}
DepartmentDAOImpl:
@Override
public Department findByDepartmentName(String departmentName) {
List<Department> departments = getSession()
.createQuery("select d from Department d where d.name =:departmentName")
.setParameter("departmentName", departmentName).list();
return departments.size() == 0 ? null : departments.get(0);
}
控制器:
@RequestMapping(value = "/updateUser", method = RequestMethod.POST)
private ModelAndView updateUser(@ModelAttribute("users") User user, BindingResult result) {
ModelAndView model = new ModelAndView();
department = departmentService.findByDepartmentName(user.getDepartment().getName());
user.setDepartment(department);
userRole = userRoleService.findByRole(user.getUserRole());
user.setUserRole(userRole);
userService.update(user);
model.addObject("allUsers", userService.getAllUsers());
model.setViewName("superAdmin");
return model;
}
我不知道怎么写userRoleService.findByRole(user.getUserRole())
。它不能正常工作。
你不需要编写任何查询来保存对象。使用entityManager.persists()方法 – Jens
但是我怎样才能添加外键“部门”? – Farik013
如果您将部门设置为用户和用户到部门,它将通过休眠来完成 – Jens