SSM框架实现增删改查

我是从:先写实体类,再写mapper的接口,再写mapper.xml文件,在写测试类,测试dao层的sql语句是否正确,在写service的接口serviImpl,再写service的实现类service,在写controller,最后写jsp页面.

第一步:导包需要用到的SSM框架的包和配置文件.(自行解决,这个都会写吧)

第二步:mapper接口

//添加
void insertUser(User user);
//查询所有
List<User> selectUser();
//根据id查
User selectById(Integer id);
//删除
void deleteById(Integer id);
//修改
void updateUser(User user);

第三步:mapper.xml文件

<insert id="insertUser" parameterType="cn.tedu.user.entity.User">
  insert into user(
  id,name,age,address
  )values(
  #{id},#{name},#{age},#{address}
  )

</insert>

<select id="selectUser" resultType="cn.tedu.user.entity.User">
select * from user
</select>

<select id="selectById" resultType="cn.tedu.user.entity.User">
  select
  id,name,age,address
  from
  user
  where
  id=#{id}
</select>

<delete id="deleteById" parameterType="cn.tedu.user.entity.User">
  delete from user
  where
  id=#{id}
</delete>

<update id="updateUser" parameterType="cn.tedu.user.entity.User">
  update
  user
  set
  id=#{id},
  name=#{name},
  age=#{age},
  address=#{address}
  where
  id=#{id}
</update>

第四步:测试mapper层sql语句

private ApplicationContext ac;
@Before
public void init(){
  ac = new ClassPathXmlApplicationContext(
    "spring-dao.xml",
    "spring-service.xml",
    "spring-mvc.xml");
}

//插入数据持久层
@Test
public void insert(){
  UserDao userDao = ac.getBean("userDao",UserDao.class);
  User user = new User();
  user.setName("小明");
  user.setAge(13);
  user.setAddress("湖北省张家界");
  userDao.insertUser(user);
  System.out.println("持久层插入成功");
}
//查询所有持久层
@Test
public void testSelectUser(){
  UserDao userDao = ac.getBean("userDao",UserDao.class);
  System.out.println(userDao.selectUser());
}

//根据id查询持久层
@Test
public void testSelectById(){
UserDao um = ac.getBean("userDao",UserDao.class);
System.out.println(um.selectById(1).getName());
}

//删除持久层
@Test
public void testDeleteById(){
  UserDao cm = ac.getBean("userDao",
    UserDao.class);
  cm.deleteById(3);
  System.out.println("持久层删除成功");
}

//测试修改持久层
@Test
public void testUpdate(){
  UserDao userDao = ac.getBean("userDao",
    UserDao.class);
  User user = new User();
  user.setId(1);
  user.setName("王晓华");
  user.setAge(45);
  user.setAddress("河南省");
  userDao.updateUser(user);
  System.out.println("持久层修改成功");
}

第五步:serviceImpl接口

//添加用户信息
void addUser(User user);
//查询所有用户信息
List<User> selectUser();
//根据id查询
User getUserById(Integer id);
//根据id删除
void deleteUserById(Integer id);
//修改用户信息
void updateUser(Integer id,String name,Integer age,String address);

第六步:service实现类(需要实现serviceImpl接口)

@Resource
private UserDao userDao;

//业务层添加用户
public void addUser(User user) {
  userDao.insertUser(user);
}
//查询所有信息
public List<User> selectUser() {
  return userDao.selectUser();
}
//根据id查询信息
public User getUserById(Integer id) {
  return userDao.selectById(id);
}
//根据id删除
public void deleteUserById(Integer id) {
  userDao.deleteById(id);
}
//修改
public void updateUser(Integer id, String name, Integer age, String address) {
  User user = new User();
  user.setId(id);
  user.setName(name);
  user.setAge(age);
  user.setAddress(address);
  userDao.updateUser(user);
}

第七步:controller层

@Resource
private UserServiceImpl userService;

//根据showAdd.do路径访问add.jsp(增加页面)
@RequestMapping("/showAdd.do")
public String showAdd() {
return "add";
}

//添加用户
@RequestMapping("/addUser.do")
public String addUser(String name,String address,Integer age){
  User user = new User();
  user.setName(name);
  user.setAddress(address);
  user.setAge(age);
  userService.addUser(user);
  return "redirect:showUser.do";
}

//查询所有信息
/*@RequestMapping("/showUser.do")
public String showUser(ModelMap map,ServletResponse response) {
  //设置编码,
  response.setCharacterEncoding("UTF-8");
  List<User> userList = userService.selectUser();
  map.addAttribute("userList",userList);
  return "index";
}*/

//删除用户
@RequestMapping("/deleteUserById.do")
public String deleteById(Integer id,ModelMap map){
  userService.deleteUserById(id);
  return "redirect:showUser.do";
}
//修改
@RequestMapping("/updateUser.do")
public String updateUser(
   Integer id,String name,
   Integer age,String address){
   userService.updateUser(id, name, age, address);
   //控制台输出id name age address
   System.out.println(id);
   System.out.println(name);
   System.out.println(age);
   System.out.println(address);
  return "redirect:showUser.do";
}
//根据id查找用户
@RequestMapping("/getUserById.do")
    public String getUserById(Integer id,ModelMap map){
        map.addAttribute("user", userService.getUserById(id));
        return "updateUser";
    }
页面在这就不写了,数据库在这也不写了,根据自己的业务需求写jsp页面和数据库字段名.

SSM框架实现增删改查

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