---

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1. 匯入依賴

首先新建一個springboot專案，勾選元件時勾選Spring Web、JDBC API、MySQL Driver

然後匯入以下整合依賴

<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>

2. 連線資料庫

資料庫程式碼：

-- 建立資料庫
CREATE DATABASE springboot;

-- 使用springboot資料庫
use springboot;

-- 建立user表
CREATE TABLE IF NOT EXISTS `user`(
	`id` INT(4) NOT NULL AUTO_INCREMENT COMMENT '身份號',
	`name` VARCHAR(30) NOT NULL DEFAULT '匿名' COMMENT '姓名',
	`pwd` VARCHAR(30) NOT NULL DEFAULT '123456' COMMENT '密碼',
	PRIMARY KEY (`id`)
)ENGINE=INNODB DEFAULT CHARSET=utf8

-- 給user表插入資料
INSERT INTO `user`(`id`,`name`,`pwd`) 
VALUES ('1','zsr',000204),('2','gcc',000421),('3','BaretH',200024);

然後IDEA連線資料庫

開啟我們建立的資料庫springboot

對應的user表

3. 編寫資料庫設定資訊

在springboot組態檔中設定資料庫資訊

spring.datasource.username=root
spring.datasource.password=200024
spring.datasource.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

4. 編寫pojo實體類

在主程式同級目錄下新建pojo包，其中新建User實體類（使用了lombok）

package com.zsr.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    int id;
    String name;
    String password;
}

5. 編寫mapper介面

在主程式同級目錄下新建mapper包，其中新建UserMapper介面

package com.zsr.mapper;

import com.zsr.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper //表示這是Mybatis的mapper類
@Repository
public interface UserMapper {
    List<User> queryUserList();

    User queryUserByID(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}j

6. 編寫mapper.xml

在resources目錄下新建mabatis包，其中新建mapper包，再在其中新建mapper.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.zsr.mapper.UserMapper">
    <select id="queryUserList" resultType="user">
        select * from user
    </select>

    <select id="queryUserByID" resultType="user">
        select * from user where id= #{id}
    </select>

    <insert id="addUser" parameterType="user">
        insert into user(id,name,pwd) values (#{id},#{name},#{pwd})
    </insert>

    <update id="updateUser" parameterType="user">
        update user set name=#{name},pwd=#{pwd} where id=#{id}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from user where id=#{id}
    </delete>
</mapper>

7. 編寫controller

在主程式同級目錄下新建controller包，在其中新建UserController

package com.zsr.controller;

import com.zsr.mapper.UserMapper;
import com.zsr.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {
    @Autowired
    private UserMapper userMapper;

    @GetMapping("/queryUserList")
    public List<User> queryUserList() {
        List<User> users = userMapper.queryUserList();
        return users;
    }

    @GetMapping("/queryUserByID")
    public User queryUserByID() {
        User user = userMapper.queryUserByID(2);
        return user;
    }

    @GetMapping("/addUser")
    public String addUser() {
        userMapper.addUser(new User(4, "zml", "45632"));
        return "增加使用者完畢";
    }

    @GetMapping("/updateUser")
    public String updateUser() {
        userMapper.updateUser(new User(4, "zml", "678910"));
        return "修改使用者完畢";
    }

    @GetMapping("/deleteUser")
    public String deleteUser() {
        userMapper.deleteUser(4);
        return "刪除使用者完畢";
    }
}

8. 測試

1. 測試存取http://localhost:8080/queryUserList

   

2. 測試存取http://localhost:8080/queryUserByID

   

3. 測試存取http://localhost:8080/addUser

   

   

4. 測試存取http://localhost:8080/updateUser

   

   

5. 測試存取http://localhost:8080/deleteUser