如果表中有額外的列，如何插入或更新多對多關係的中間表中的行？

Question

我知道如何插入/更新行成的許多一對多的關係中間表，如果表只有外鍵列：

@Entity 
@Table(name = "role") 
public class Role { 

    @Id 
    private String role_code; 

    private String role_lib; 

    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL) 
    @JoinTable(name = "role_menu" , joinColumns = {@JoinColumn(name = "role_code")} , inverseJoinColumns = {@JoinColumn(name = "menu_id")}) 
    private Set<Menu> menus = new HashSet<Menu>(); 

    public Role() { 
     super(); 
    } 

    public Role(String role_lib) { 
     super(); 
     this.role_lib = role_lib; 
    } 

    public Role(String role_lib, Set<Menu> menus) { 
     super(); 
     this.role_lib = role_lib; 
     this.menus = menus; 
    } 

    public String getRole_code() { 
     return role_code; 
    } 

    public void setRole_code(String role_code) { 
     this.role_code = role_code; 
    } 

    public String getRole_lib() { 
     return role_lib; 
    } 

    public void setRole_lib(String role_lib) { 
     this.role_lib = role_lib; 
    } 

    public Set<Menu> getMenus() { 
     return menus; 
    } 

    public void setMenus(Set<Menu> menus) { 
     this.menus = menus; 
    } 

} 

@Entity 
@Table(name = "menu") 
public class Menu { 

    @Id 
    @SequenceGenerator(name="s_menu", sequenceName="s_menu", allocationSize=1) 
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="s_menu") 
    private int menu_id; 

    private Integer gmnu_code; 

    private String menu_lib; 

    private Integer menu_ordre; 

    private Integer menu_visible; 

    private Integer menu_deleted; 

    private Integer menu_bouton; 

    private Integer menu_parent; 

    private String menu_controlleur; 

    private String menu_navigation; 

    private Integer menu_flag_trace; 

    private String menu_trace; 

    @ManyToMany(fetch = FetchType.LAZY, mappedBy = "menus") 
    private Set<Role> roles = new HashSet<Role>(); 

    @Transient 
    private int depth; 

    @Transient 
    private Environment env; 

    public Menu() { 
     super(); 
    } 

    public Menu(Integer gmnu_code, String menu_lib, Integer menu_ordre, Integer menu_visible, Integer menu_deleted, Integer menu_bouton, Integer menu_parent, String menu_controlleur, String menu_navigation, Integer menu_flag_trace, String menu_trace) { 
     super(); 
     this.gmnu_code = gmnu_code; 
     this.menu_lib = menu_lib; 
     this.menu_ordre = menu_ordre; 
     this.menu_visible = menu_visible; 
     this.menu_deleted = menu_deleted; 
     this.menu_bouton = menu_bouton; 
     this.menu_parent = menu_parent; 
     this.menu_controlleur = menu_controlleur; 
     this.menu_navigation = menu_navigation; 
     this.menu_flag_trace = menu_flag_trace; 
     this.menu_trace = menu_trace; 
    } 

    public Menu(Integer gmnu_code, String menu_lib, Integer menu_ordre, Integer menu_visible, Integer menu_deleted, Integer menu_bouton, Integer menu_parent, String menu_controlleur, String menu_navigation, Integer menu_flag_trace, String menu_trace, Set<Role> roles) { 
     super(); 
     this.gmnu_code = gmnu_code; 
     this.menu_lib = menu_lib; 
     this.menu_ordre = menu_ordre; 
     this.menu_visible = menu_visible; 
     this.menu_deleted = menu_deleted; 
     this.menu_bouton = menu_bouton; 
     this.menu_parent = menu_parent; 
     this.menu_controlleur = menu_controlleur; 
     this.menu_navigation = menu_navigation; 
     this.menu_flag_trace = menu_flag_trace; 
     this.menu_trace = menu_trace; 
     this.roles = roles; 
    } 

    public int getMenu_id() { 
     return menu_id; 
    } 

    public void setMenu_id(int menu_id) { 
     this.menu_id = menu_id; 
    } 

    public Integer getGmnu_code() { 
     return gmnu_code; 
    } 

    public void setGmnu_code(Integer gmnu_code) { 
     this.gmnu_code = gmnu_code; 
    } 

    public String getMenu_lib() { 
     return menu_lib; 
    } 

    public void setMenu_lib(String menu_lib) { 
     this.menu_lib = menu_lib; 
    } 

    public Integer getMenu_ordre() { 
     return menu_ordre; 
    } 

    public void setMenu_ordre(Integer menu_ordre) { 
     this.menu_ordre = menu_ordre; 
    } 

    public Integer getMenu_visible() { 
     return menu_visible; 
    } 

    public void setMenu_visible(Integer menu_visible) { 
     this.menu_visible = menu_visible; 
    } 

    public Integer getMenu_deleted() { 
     return menu_deleted; 
    } 

    public void setMenu_deleted(Integer menu_deleted) { 
     this.menu_deleted = menu_deleted; 
    } 

    public Integer getMenu_bouton() { 
     return menu_bouton; 
    } 

    public void setMenu_bouton(Integer menu_bouton) { 
     this.menu_bouton = menu_bouton; 
    } 

    public Integer getMenu_parent() { 
     return menu_parent; 
    } 

    public void setMenu_parent(Integer menu_parent) { 
     this.menu_parent = menu_parent; 
    } 

    public String getMenu_controlleur() { 
     return menu_controlleur; 
    } 

    public void setMenu_controlleur(String menu_controlleur) { 
     this.menu_controlleur = menu_controlleur; 
    } 

    public String getMenu_navigation() { 
     if (this.env != null) 
      return env.getProperty(menu_navigation); 
     return menu_navigation; 
    } 

    public void setMenu_navigation(String menu_navigation) { 
     this.menu_navigation = menu_navigation; 
    } 

    public String getMenu_trace() { 
     if (this.env != null) 
      return env.getProperty(menu_trace); 
     return menu_trace; 
    } 

    public void setMenu_trace(String menu_trace) { 
     this.menu_trace = menu_trace; 
    } 

    public Integer getMenu_flag_trace() { 
     return menu_flag_trace; 
    } 

    public void setMenu_flag_trace(Integer menu_flag_trace) { 
     this.menu_flag_trace = menu_flag_trace; 
    } 

    public Set<Role> getRoles() { 
     return roles; 
    } 

    public void setRoles(Set<Role> roles) { 
     this.roles = roles; 
    } 

    public void setEnv(Environment env) { 
     this.env = env; 
    } 

    public int getDepth() { 
     return depth; 
    } 

    public void setDepth(int depth) { 
     this.depth = depth; 
    } 

} 

@Controller 
@RequestMapping("/role") 
public class AdminRole { 

    @Autowired 
    private MenuDAO menuDao; 

    @Autowired 
    private RoleDAO roleDao; 

    ... 

    @RequestMapping(value = "/menu", method = RequestMethod.POST) 
    public ModelAndView attribuerMenus(HttpServletRequest request, HttpSession session, @RequestParam Map<String, String> params) { // inserting rows into the intermediate table 

     String role_code = ""; 

     Set<Menu> menus = new HashSet<Menu>(); 

     for (Map.Entry<String, String> param : params.entrySet()) { // input name : param.getKey() , input value : param.getValue() 

      if (param.getKey().equals(new String("role_code"))) 

       role_code = param.getValue(); 

      else 

       menus.add(menuDao.get(Integer.parseInt(param.getValue()))); 

     } 

     roleDao.insertRoleMenus(roleDao.get(role_code), menus); 

     return new ModelAndView("redirect:/role/"); 

    } 

} 

public class RoleDAOImpl implements RoleDAO { 

    @Autowired 
    private SessionFactory sessionFactory; 

    public RoleDAOImpl() { 
     super(); 
    } 

    public RoleDAOImpl(SessionFactory sessionFactory) { 
     super(); 
     this.sessionFactory = sessionFactory; 
    } 

    ... 

    @Override 
    @Transactional 
    public Role get(String role_code) { 

     return (Role) sessionFactory.getCurrentSession().get(Role.class, role_code); 

    } 

    @Override 
    @Transactional 
    public void insertRoleMenus(Role role, Set<Menu> menuSet) { 

     role.setMenus(menuSet); 

     sessionFactory.getCurrentSession().merge(role); 

    } 

} 

現在，如果中間表「role_menu」有一個額外的列，說some_column varchar2(100)，如何插入/更新數據到這個列「some_column」？在現有的類

@Entity 
RoleMenu 
@ManyToOne Menu 
@ManyToOne Role 
String some_column 

使用一對多：

Answer 1

爲它創建實體

@OneToMany 
RoleMenu