一、增——增加用户
1.创建实体类
package com.dxh.pojo;
public class Users {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
2.创建mapper接口以及映射配置文件
package com.dxh.mapper;
import com.dxh.pojo.Users;
public interface UsersMapper {
void insertUser(Users users);
}
<?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.dxh.mapper.UsersMapper">
<!-- 在properties文件中配置过别名了，所以parameterType不需要写Users的包的名称了 -->
<insert id="insertUser" parameterType="Users">
insert into users(name,age) values (#{name},#{age})
</insert>
</mapper>
3.创建业务层
package com.dxh.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.dxh.mapper.UsersMapper;
import com.dxh.pojo.Users;
import com.dxh.service.UsersService;
@Service
@Transactional
public class UserServiceImpl implements UsersService{
@Autowired
private UsersMapper usersMapper;
@Override
public void addUser(Users users) {
this.usersMapper.insertUser(users);
}
}
package com.dxh.service;
import com.dxh.pojo.Users;
public interface UsersService {
void addUser(Users users);
}
4.创建Controller
package com.dxh.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import com.dxh.pojo.Users;
import com.dxh.service.UsersService;
@Controller
@RequestMapping("/users")
public class UsersController {
@Autowired
private UsersService usersService;
/**
* 页面跳转的方法
*/
@RequestMapping("/{page}")
public String showPage(@PathVariable String page) {
return page;
}
/**
* 添加用户
*/
@RequestMapping("/addUser")
public String addUser(Users users) {
this.usersService.addUser(users);
return "ok";
}
}
5.编写页面:src/main/resources/templates/ input.html 和 ok.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>AddUser</title>
</head>
<body>
<form th:action="@{/users/addUser}" method="post">
userName: <input type="text" name="name"/></br>
userAge: <input type="text" name="age"/></br>
<input type="submit" value="SUBMIT">
</form>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>OK</title>
</head>
<body>
addUser Success!
</body>
</html>
6.启动类:
- 新增注解：@MapperScan("com.dxh.mapper") //用于扫描mybatis的Mapper接口
package com.dxh;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.dxh.mapper") //用于扫描mybatis的Mapper接口
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
二、查——查询用户
1.在mapper接口中以及映射配置文件中添加相关代码
List<Users> selectUserAll();
<select id="selectUserAll" resultType="Users">
SELECT id,name,age from users
</select>
2.在业务层中添加查询方法
List<Users> findUserAll();
@Override
public List<Users> findUserAll() {
return this.usersMapper.selectUserAll();
}
3.编写controller
/**
* 查询全部用户
*/
@RequestMapping("/findUserAll")
public String findUserAll(Model model) {
List<Users> list = this.usersService.findUserAll();
model.addAttribute("list",list);
return "showUsers";
}
4.创建页面
在src/main/resources/templates/showUsers.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>展示用户数据</title>
</head>
<body>
<table border="1" style="300px">
<tr>
<th>ID</th>
<th>名称</th>
<th>年龄</th>
</tr>
<tr th:each="user : ${list}">
<td th:text="${user.id}"></td>
<td th:text="${user.name}"></td>
<td th:text="${user.age}"></td>
</tr>
</table>
</body>
</html>
5.访问
http://localhost:8080/users/findUserAll
三、改——用户更新
分为两部分，一是数据回显，二是提交页面
1.修改Mapper文件和映射配置
Users selectUsersById(Integer id);
<select id="selectUsersById" resultType="Users" parameterType="int">
SELECT id,name,age from users where id = #{id}
</select>
2.修改业务层代码
Users findUserById(Integer id);
@Override
public Users findUserById(Integer id) {
return this.usersMapper.selectUsersById(id);
}
3.编写Controller
/**
* 根据用户id查询用户
*/
@RequestMapping("/findUserById")
public String findUserById(Integer id ,Model model) {
Users user = this.usersService.findUserById(id);
model.addAttribute("user",user);
return "updatePage";
}
4.在src/main/resources/templates/updatePage.html创建html页面
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form th:action="@{/users/editUser}" method="post">
<input type="hidden" name="id" th:field="${user.id}">
userName: <input type="text" name="name" th:field="${user.name}"/></br>
userAge: <input type="text" name="age" th:field="${user.age}"/></br>
<input type="submit" value="SUBMIT">
</form>
</body>
</html>
5.编辑showUsers.html文件
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>展示用户数据</title>
</head>
<body>
<table border="1" style="300px">
<tr>
<th>ID</th>
<th>名称</th>
<th>年龄</th>
<th>操作</th>
</tr>
<tr th:each="user : ${list}">
<td th:text="${user.id}"></td>
<td th:text="${user.name}"></td>
<td th:text="${user.age}"></td>
<td>
<a th:href="@{/users/findUserById(id=${user.id})}">更新用户</a>
</td>
</tr>
</table>
</body>
</html>
6.修改Mapper接口和映射配置文件
void updateUser(Users users);
<update id="updateUser" parameterType="Users">
update users set name=#{name} , age=#{age} where id=#{id}
</update>
7.修改业务层代码
void updateUser(Users users);
@Override
public void updateUser(Users users) {
this.usersMapper.updateUser(users);
}
8.编写controller
@RequestMapping("/editUser")
public String editUser(Users users,Model model) {
this.usersService.updateUser(users);
return "ok";
}
四、删——删除用户
1.修改Mapper以及映射配置文件
void deleteUserByid(Integer id);
<delete id="deleteUserByid">
delete from users where id = #{id}
</delete>
2.修改业务层方法
void deleteUserById(Integer id);
@Override
public void deleteUserById(Integer id) {
this.usersMapper.deleteUserByid(id);
}
3.修改controller
/**
* 删除用户
*/
@RequestMapping("/delUser")
public String delUser(Integer id) {
this.usersService.deleteUserById(id);
return "redirect:/users/findUserAll";
}
4.修改showUsers.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>展示用户数据</title>
</head>
<body>
<table border="1" style="300px">
<tr>
<th>ID</th>
<th>名称</th>
<th>年龄</th>
<th>操作</th>
</tr>
<tr th:each="user : ${list}">
<td th:text="${user.id}"></td>
<td th:text="${user.name}"></td>
<td th:text="${user.age}"></td>
<td>
<a th:href="@{/users/findUserById(id=${user.id})}">更新用户</a></br>
<a th:href="@{/users/delUser(id=${user.id})}">删除用户</a>
</td>
</tr>
</table>
</body>
</html>