第一步： 创建一个SpringBoot的工程，在其中的Maven依赖配置中添加对JDBC、MyBatis、Mysql Driver的依赖具体如下：

<!-- JDBC -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!-- MyBatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- MySQL Driver -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

第二步：在SprintBoot的配置文件application-dev.yml中添加mybatis、数据源的配置：

 

mybatis:
  mapper-locations: classpath:mapping/*.xml 
  type-aliases-package: com.vishee.pojo
mapper-locations：扫描指定路径下的*.xml的映射文件
type-aliases-package：完全限定名来指定这些POJO的引用

datasource:
    username: 数据库登录用户名
    password: 数据库登录密码
    url: jdbc:mysql://数据库ip地址:端口/数据库名称?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver

第三步：使用 Navicat在数据库上创建一个用于测试的数据库和数据表

数据库名称为：cs_orchard

表名和结构：login_user{

id int
user_name varchar
password varchar
description varchar

}

写入几条记录：

第四步：代码工程结构创建

  • 四个包以com.cs.pojo、com.cs.mapper、com.cs.service、com.cs.controller
  • 在src/main/resources下创建mapping文件夹用于存放mybatis的映射xml

第五步：编写代码

  1. 在pojo报下创建一个实体类如：LoginUser
@Component
public class LoginUser {
    private int id;
    private String user_name;
    private String password;
    private String description;
    
    public LoginUser(){}
    
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    
    
    public String getUser_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

　　2. 创建Mybatis的接口

@Mapper
public interface  LoginUserMapper {
    //获取用户名单
    public List<LoginUser> getLoginUser() throws Exception;
    
    //根据id删除用户
    public void deleteLoginUser(int id)throws Exception;
    
    //新增用户
    public void addLoginUser(LoginUser user)throws Exception;
}

　　3. 编写LoginUser的映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://www.mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.cs.mapper.LoginUserMapper">
    <select id="getLoginUser" resultType="com.cs.pojo.LoginUser">
        select * from login_user
    </select>
    <delete id="deleteLoginUser" parameterType="Integer">
        delete from login_user where id =#{id}
    </delete>
    <insert id="addLoginUser" parameterType="com.cs.pojo.LoginUser">
        insert into login_user(user_name, password, description) values (#{user_name}, #{password}, #{description})
    </insert>
</mapper>

其中注意每个操作与mapper接口类的对应，resultType和parameterType的类型。

　　4. 业务层的接口与实现类：LoginUserService.java  LoginUserServiceImp.java

public interface LoginUserService {
    
    public List<LoginUser> getLoginUser() throws Exception;

    public void deleteUser(int id) throws Exception;

    public void addLoginUser(LoginUser user) throws Exception;
@Service
public class LoginUserServiceImp implements LoginUserService {
    @Autowired
    private LoginUserMapper loginUserMapper;
    
    public List<LoginUser> getLoginUser(){
        try {
            return loginUserMapper.getLoginUser();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public void deleteUser(int id) {
        try {
            loginUserMapper.deleteLoginUser(id);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void addLoginUser(LoginUser user) {
        try {
            loginUserMapper.addLoginUser(user);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

　　5.  前端控制器类：LoginUserController

@RestController
@RequestMapping("/loginuser")
public class LoginUserController {
    
    @Autowired
    private LoginUserService loginUserService;
    @Autowired
    private LoginUser user;
    
    //显示用户
    @RequestMapping("/list")
    public List<LoginUser> index() throws Exception {
        return loginUserService.getLoginUser();
    }
    
    //删除用户
    @RequestMapping("/delete/{id}")
    public String delete(@PathVariable int id) throws Exception {
        loginUserService.deleteUser(id);
        return "你已经删掉了id为"+id+"的用户";
    }
    
    //增加用户
    @RequestMapping("/addLoginUser")
    public String addLoginUser() throws Exception {
        user.setUser_name("阿花2");
        user.setPassword("ddccs那还");
        user.setDescription("这是我阿花的行配置");
        loginUserService.addLoginUser(user);
        return "增加用户";
    }
}

调试运行，在浏览器中输入地址访问测试。

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