Question

我尝试使用spring和hibernate构建app，buat我有很多关系表的问题。我成功添加到数据库，但我有一个问题，收集数据。有这种关系的用户和角色表。我尝试获取所有用户角色数据，例如，如果用户有2个角色（Role_user和Role_admin），我想从特定用户那里收集所有角色。但是把脚本，我的日志hibernate成功收集数据，但之后hibernate也删除了用户角色数据。这很奇怪，我试图找到这个bug，因为我没有把删除方法。

这里是我的scipt

user.java

@Entity
@Table
public class User {

@Id
@GeneratedValue
private int id;

private String userName;

private String email;

private String password;

private boolean enabled;

@ManyToMany
@JoinTable
private List<Role> roles;
/**
@OneToOne
private Employee employee;
**/
public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getUserName() {
    return userName;
}

public void setUserName(String userName) {
    this.userName = userName;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

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

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

/**
 * @return the enabled
 */
public boolean isEnabled() {
    return enabled;
}

/**
 * @param enabled the enabled to set
 */
public void setEnabled(boolean enabled) {
    this.enabled = enabled;
}




}

Role.java

@Entity
@Table
public class Role {
@Id
@GeneratedValue
private int id;

private String name;

@ManyToMany(mappedBy="roles")
private List<User> users;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public List<User> getUsers() {
    return users;
}

public void setUsers(List<User> users) {
    this.users = users;
}


}

UserController.java

@Controller
public class UserController {
@Autowired
private UserService userService;

@RequestMapping(value="user", method = RequestMethod.GET)
public String list(Model model) {
    model.addAttribute("user", new User());
    model.addAttribute("userlist", this.userService.findAll());

    return "user";
}

    //for add and edit
    @RequestMapping(value= "/addAndEditUser", method = RequestMethod.POST)
    public String addAndEditUser(@ModelAttribute("user") User user){
        if(user.getId() == 0){
            //new employee status, call save
            this.userService.save(user);
        }else{
            this.userService.update(user);
        }


        return "redirect:/user";

    }

    //For add 
    @RequestMapping(value= "/addUser", method = RequestMethod.POST)
    public String addUser(@ModelAttribute("user") User user){
        //new employee status, call save
        this.userService.save(user);
        return "redirect:/user";

    }

    //for edit
    @RequestMapping(value= "/updateUser", method = RequestMethod.POST)
    public String updateUser(@ModelAttribute("user") User user){

        //existing Employee status, call update function from service

        userService.update(user);
        return "redirect:/user";

    }

    @RequestMapping("/removeUser/{id}")
    public String removeUser(@PathVariable("id") int id){

        this.userService.delete(id);
        return "redirect:/user";
    }

    //for call edit in list
    @RequestMapping("/editUser/{id}")
    public String editUser(@PathVariable("id") int id, Model model){

        model.addAttribute("religionlist", this.userService.findAll());
        model.addAttribute("user", this.userService.findById(id));
        return "formUser";
    }
     @RequestMapping("/users/{id}")
     public String detail(Model model, @PathVariable int id){
         model.addAttribute("users", userService.findOneWithRole(id));

         return "user-detail";
     }

 }

userSericeImpl.java

@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserDao userDao;



@Transactional
public User findById(int id) {
    return userDao.findById(id);
}

@Transactional
public List<User> findAll() {
    return userDao.findAll();
}

@Transactional
public void save(User user) {
    user.setEnabled(true);


    userDao.save(user);

}

@Transactional
public void update(User user) {
    userDao.update(user);

}

@Transactional
public void delete(int id) {
    userDao.delete(id);

}

@Transactional
public User findOne(int id) {

    return userDao.findOne(id);
}

@Transactional
public User findOneWithRole(int id) {

    return userDao.findOneWithRole(id);
}

}

UserDaoImpl.java

@Repository
public class UserDaoImpl implements UserDao{

private static final Logger logger =   LoggerFactory.getLogger(UserDaoImpl.class);

@Autowired
private SessionFactory sessionFactory;

@Autowired
private RoleDao roleDao;

public User findById(int id) {

    return (User)sessionFactory.getCurrentSession().get(User.class, id);
}

@SuppressWarnings("unchecked")
public List<User> findAll() {
    Session session = this.sessionFactory.getCurrentSession();
    List<User> userList = session.createQuery("from User").list();
    return userList;
}


public void save(User user) {
    Session session = this.sessionFactory.getCurrentSession();

    List<Role> roles = new ArrayList<Role>();
    //roles.add(roleDao.findById(2));


    roles.add(roleDao.findByName("ROLE_USER"));
    user.setRoles(roles);

    session.persist(user);
}


public void update(User user) {
    Session session = this.sessionFactory.getCurrentSession();
    session.update(user);
    logger.info("Employee Status updated successfully, departement  Details="+user);
}


public void delete(int id) {
    sessionFactory.getCurrentSession().delete(findById(id));

}

public User findOne(int id) {

    return (User)sessionFactory.getCurrentSession().get(User.class, id);
}


public User findOneWithRole(int id) {
    User user = findById(id);
    List<Role> roles =  roleDao.findByUser(id);
    user.setRoles(roles);
    return user;
}

}

RoleDaoImpl.java

@Repository
public class RoleDaoImpl implements RoleDao{
private static final Logger logger = LoggerFactory.getLogger(RoleDaoImpl.class);

@Autowired
private SessionFactory sessionFactory;

public Role findById(int id) {

    return (Role)sessionFactory.getCurrentSession().get(Role.class, id);
}

@SuppressWarnings("unchecked")
public List<Role> findAll() {
    Session session = this.sessionFactory.getCurrentSession();
    List<Role> roleList = session.createQuery("from Role").list();
    return roleList;
}


public void save(Role role) {
    Session session = this.sessionFactory.getCurrentSession();
    session.persist(role);
}


public void update(Role role) {
    Session session = this.sessionFactory.getCurrentSession();
    session.update(role);
    logger.info("Employee Status updated successfully, departement Details="+role);
}


public void delete(int id) {
    sessionFactory.getCurrentSession().delete(findById(id));

}


public Role findByName(String name) {

    Query query = sessionFactory.getCurrentSession().createQuery("from Role where name=:name");
    query.setParameter("name", name);
    Role role = (Role)query.uniqueResult();
    return role;
}


@SuppressWarnings("unchecked")
public List<Role> findByUser(int id) {
    Session session = this.sessionFactory.getCurrentSession();
    List<Role> roles = session.createQuery("from Role where id=:id").setString("id", "%" + id + "%").list();

    return roles;
}


}

用户detail.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>


<h1>${users.userName}</h1>
<br>
User Role
<c:forEach items="${users.roles}" var="role">
<h1>${role.name}</h1>

</c:forEach>

当我看到用户详细信息时记录应用程序：

10:34:32,801 DEBUG AnnotationTransactionAttributeSource:108 - Adding    transactional method 'UserServiceImpl.findOneWithRole' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''
Hibernate: 
 select
    user0_.id as id6_0_,
    user0_.email as email6_0_,
    user0_.enabled as enabled6_0_,
    user0_.password as password6_0_,
    user0_.userName as userName6_0_ 
 from
    User user0_ 
 where
    user0_.id=?
Hibernate: 
 select
    role0_.id as id5_,
    role0_.name as name5_ 
 from
    Role role0_ 
 where
    role0_.id=?
Hibernate: 
 delete 
 from
    User_Role 
 where
    users_id=?

如何调用delete方法？我怎么能解决这个问题？我想列出特定用户的所有角色。

提前感谢:) 如果你不介意教我如何更新和删除（多对多）......：）

Answer 1

在你的控制器中，我看到你调用userService.findOneWithRole（id）来获取用户的详细信息，如下所示：

 @RequestMapping("/users/{id}")
 public String detail(Model model, @PathVariable int id){
     model.addAttribute("users", userService.findOneWithRole(id));

     return "user-detail";
 }

回溯到UserDaoImpl类中的findOneWithRole（int id）方法，您将看到您为用户分配了不必要的角色，并且还会导致DELETE发生。您可以尝试删除它，看看它是否有效。

public User findOneWithRole(int id) {
    User user = findById(id);
    List<Role> roles =  roleDao.findByUser(id);
    user.setRoles(roles); // <-- THIS LINE
    return user;
}

使用Spring + Hibernate收集/获取与多对多关系的所有数据

1 个答案: