1.创建一个SpringBoot项目
2.导入依赖
勾选上web下面的SpringWeb和sql下面的MySQL和Mybatis 依赖 然后等待依赖下载导入
2.1 依赖导入后的页面
3.创建需要的包和Mybatis配置文件
3.1在原来的com.mybatis包下创建了entity，controller，service，mapper四个包
3.2在resource下创建了mybatis-config.xml为Mybatis核心配置文件
3.3还在resource下创建了一个包com.mybatis.mapper （注意）
resource下创建包的格式 为 com/mybatis/mapper
3.4将application.properties改为application.yml 后缀名改为yml
4.数据库的创建和连接
4.1数据库SQL语句
先创建名为mybatis的数据库然后执行以下sql语句
/*
Navicat Premium Data Transfer
Source Server : localhost_3306
Source Server Type : MySQL
Source Server Version : 80033
Source Host : localhost:3306
Source Schema : mybatis
Target Server Type : MySQL
Target Server Version : 80033
File Encoding : 65001
Date: 10/08/2024 11:15:28
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(0) NOT NULL AUTO_INCREMENT,
`username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
`password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
`phone` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 12 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, '李四', '123456', '17896325478');
INSERT INTO `user` VALUES (2, 'username', 'password', '17896325478');
INSERT INTO `user` VALUES (3, 'username', 'password', '17896325478');
SET FOREIGN_KEY_CHECKS = 1;
4.2 application.yml的配置
#设置端口号
server:
port: 8282
#设置数据配置信息
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/mybatis
username: root
password: 123456
4.3mybatis-config,xml的配置
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<!--将表中下划线的字段自动转成驼峰命名-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<typeAliases>
<!--给所有返回结果起别名-->
<package name="com.mybatis.entity"/>
</typeAliases>
<mappers>
<!--xml需和mapper接口同样的目录-->
<package name="com.mybatis.mapper"/>
</mappers>
</configuration>
5.实体层，controller层，service层和mapper层的编写
5.1实体层(entity)
根据数据库字段创建对应的属性
package com.mybatis.entity;
public class User {
private Integer id;
private String username;
private String password;
private String phone;
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", phone='" + phone + '\'' +
'}';
}
public User() {
}
public User(Integer id, String username, String password, String phone) {
this.id = id;
this.username = username;
this.password = password;
this.phone = phone;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}
5.2mapper层(接口)
package com.mybatis.mapper;
import com.mybatis.entity.User;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface UserMapper {
/*
* 查询所有用户
* */
List<User> getAllUser();
/*
* 添加用户
* */
Integer addUser(User user);
/*
* 更新用户信息
* */
Integer updateUser(User user);
/*
* 删除用户信息
* */
Integer deleteUser(Integer id);
}
5.3 service层
package com.mybatis.sevice;
import com.mybatis.entity.User;
import com.mybatis.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserService {
@Autowired
UserMapper userMapper;
public List<User> getAllUser(){
return userMapper.getAllUser();
}
public Integer addUser(User user){
return userMapper.addUser(user);
}
public Integer updateUser(User user){
return userMapper.updateUser(user);
}
public Integer deleteUser(Integer id){
return userMapper.deleteUser(id);
}
}
5.4controller层
package com.mybatis.controller;
import com.mybatis.entity.User;
import com.mybatis.sevice.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/api")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/all")
public List<User> getAllUser(){
return userService.getAllUser();
}
@PostMapping("/add")
public Integer addUser(@RequestBody User user){
return userService.addUser(user);
}
@PutMapping("/update")
public Integer updateUser(@RequestBody User user){
return userService.updateUser(user);
}
@DeleteMapping("/delete/{id}")
public Integer deleteUser(@PathVariable("id") Integer id){
return userService.deleteUser(id);
}
}
5.5UserMapper.xml
<?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.mybatis.mapper.UserMapper">
<!-- List<User> getAllUser();-->
<select id="getAllUser" resultType="com.mybatis.entity.User">
select * from user
</select>
<!-- Integer addUser(User user);-->
<insert id="addUser" parameterType="com.mybatis.entity.User">
insert into user (username,password,phone)
values (#{username},#{password},#{phone})
</insert>
<!-- Integer updateUser(User user);-->
<update id="updateUser" parameterType="com.mybatis.entity.User">
update user set username = #{username},password =#{password},phone=#{phone}
where id = #{id}
</update>
<!-- Integer deleteUser(Integer id);-->
<delete id="deleteUser" parameterType="java.lang.Integer">
delete from user where id =#{id}
</delete>
</mapper>5.6整体页面
6.测试接口
发现都能正常使用
