DAY-04-JAVAWeb项目之增删改查操作数据库
先看目录结构
UserDao
定义增删改查接口
public interface UserDao {
User findUserByUserName(String username);
List<User> findAll();
void deleteById(int id);
void add(User user);
User selectUserById(int id);
void updateById(User user);
}
UserController实现接口方法
@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(){
List<User> userList = userService.findAll();
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("userList",userList);
modelAndView.setViewName("user-list");
return modelAndView;
}
@RequestMapping("/deleteById.do")
public String delete(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){
User user = userService.selectUserById(id);
ModelAndView modelAndView = new ModelAndView();
modelAndView.setViewName("user-update");
modelAndView.addObject("user",user);
return modelAndView;
}
@RequestMapping("/updateUserById.do")
public String updateUserById(User user){
userService.updateUserById(user);
return "redirect:findAll.do";
}
}
IUserService增删改查操作数据库接口
public interface IUserService { boolean login(String username, String password);
void deleteById (int id);
List<User> findAll();
void add(User user);
User selectUserById(int id);
void updateUserById(User user);
}
UserService具体实现
@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;
}else{
return false;
}
}
@Override
public List<User> findAll() {
return userDao.findAll();
}
@Override
public void deleteById(int id){
userDao.deleteById(id);
}
@Override
public void add(User user) {
userDao.add(user);
}
@Override
public User selectUserById(int id) {
return userDao.selectUserById(id);
}
@Override
public void updateUserById(User user){
userDao.updateById(user);
}
}
UserMapping.xml增删改查具体实现语句
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.wzbc.dao.UserDao" >
<select id="findUserByUserName" parameterType="String" resultType="com.wzbc.bean.User">
select * from tb_user where username = #{username}
</select>
<select id="findAll" parameterType="String" resultType="com.wzbc.bean.User">
select * from tb_user
</select>
<delete id="deleteById" parameterType="int">
delete from tb_user where id = #{id}
</delete>
<insert id="add" parameterType="user">
insert into tb_user (username,password) values(#{username},#{password})
</insert>
<select id="selectUserById" parameterType="int" resultType="user">
select * from tb_user where id=#{id}
</select>
<update id="updateById" parameterType="user">
update tb_user set username = #{username}, password = #{password} where id = #{id}
</update>
