ssm2 实现增删改查
<mapper namespace="com.zr.dao.UserDao" >
<select id="findUserByUserName" parameterType="String" resultType="user">
select * from db_user where username=#{username}
</select>
<select id="findAll" resultType="user">
select * from db_user
</select>
<delete id="deleteById" parameterType="int">
delete from db_user where id=#{id}
</delete>
<insert id="add" parameterType="user">
insert into db_user (username,password) values (#{username},#{password})
</insert>
<select id="selectUserById" parameterType="int" resultType="user">
select * from db_user where id=#{id}
</select>
<update id="update" parameterType="user">
update db_user set id=#{id},username=#{username},password=#{password}
</update>
</mapper>
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private IUserService userService;
@RequestMapping("/login.do")
public ModelAndView login(User user){
boolean flag = userService.login(user.getUsername(), user.getPassword());
ModelAndView modelAndView=new ModelAndView();
if(flag){
modelAndView.setViewName("main");
}else {
modelAndView.setViewName("../failer");
}
return modelAndView;
}
@RequestMapping("/findAll.do")
public ModelAndView findAll(){
ModelAndView modelAndView=new ModelAndView();
List<User> users = userService.findAll();
modelAndView.addObject("users", users);
modelAndView.setViewName("user-list");
return modelAndView;
}
@RequestMapping("/deleteById.do")
public String deleteById(int id){
userService.deleteById(id);
return "redirect:findAll.do";
}
@RequestMapping("/add.do")
public String add(User user){
userService.add(user);
return "redirect:findAll.do";
}
@RequestMapping("/toUpdate.do")
public ModelAndView toUpdate(int id){
ModelAndView modelAndView=new ModelAndView();
User user=userService.selectUserById(id);
modelAndView.addObject("user",user);
modelAndView.setViewName("user-update");
return modelAndView;
}
@RequestMapping("/update.do")
public String update(User user){
ModelAndView modelAndView=new ModelAndView();
userService.update(user);
modelAndView.addObject("user",user);
modelAndView.setViewName("user-update");
return "redirect:findAll.do";
}
}
public interface UserDao {
User findUserByUserName(String username);
List<User> findAll();
void deleteById(int id);
void add(User user);
User selectUserById(int id);
void update(User user);
}
@Service
public class UserService implements IUserService {
@Autowired
private UserDao userDao;
@Override
public boolean login(String username, String password) {
User user = userDao.findUserByUserName(username);
if (user!=null && user.getPassword().equals(password)){
return true;
}
return false;
}
@Override
public List<User> findAll() {
List<User> users = userDao.findAll();
return users;
}
@Override
public void deleteById(int id) {
userDao.deleteById(id);
}
@Override
public void add(User user) {
userDao.add(user);
}
@Override
public User selectUserById(int id) {
User user = userDao.selectUserById(id);
return user;
}
@Override
public void update(User user) {
userDao.update(user);
}
}
public interface IUserService {
boolean login(String username,String password);
List<User> findAll();
void deleteById(int id);
void add(User user);
User selectUserById(int id);
void update(User user);
}
Processed:
0.024, SQL:
9
