1、安装mysql镜像

前文中我们安装了docker和redis镜像，并在idea中成功连接，现在安装mysql镜像

docker pull mysql ，默认最新版本

ps:可以参考https://www.runoob.com/docker/docker-install-mysql.html

2、启动mysql

打开powershell，执行
docker run -itd --name mysql-test -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql

注意：这里直接用可视化界面启动，容易忘记设置端口号映射，所以选择命令行执行

3、登录mysql

在powershell中执行 mysql -h localhost -u root -p

输入密码 123456

4、 创建数据库

create datebase testDB

5、创建表

这一步可以在IDEA中执行

6、IDEA进行配置

yml：

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/testDB?useUnicode=true&characterEncoding=utf-8&useSSL=false&allowMultiQueries=true&serverTimezone=Asia/Shanghai
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver

mybatis:
  mapper-locations:
    - classpath:mybatis/*.xml

pom：

<!-- 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>2.1.3</version>
</dependency>
<!-- mysql -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

示例：
创建mapper和po

创建mapper.xml

xml示例：

<?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.example.demov2.mapper.OrderMapper">
    <resultMap id="orderMap" type="com.example.demov2.po.OrderPO">
        <id property="id" column="id" jdbcType="BIGINT"/>
        <result property="orderId" column="order_id" jdbcType="VARCHAR" />
        <result property="userId" column="user_id" jdbcType="BIGINT" />
        <result property="createTime" column="create_time" jdbcType="TIMESTAMP" />
        <result property="updateTime" column="update_time" jdbcType="TIMESTAMP"/>
    </resultMap>

    <select id="selectById" resultMap="orderMap">
        select
            *
        from
            `order`
        where
            `id`= #{id}
    </select>
</mapper>

启动类添加注解：@MapperScan(“com.example.demov2.mapper”)

@SpringBootApplication
@MapperScan("com.example.demov2.mapper")
public class DemoV2Application {
}

7、测试

@SpringBootTest
@RunWith(SpringRunner.class)
public class OrderServiceTest {

    @Autowired
    public OrderService orderService;

    @Test
    public void getTest() {
        OrderPO orderPO = orderService.get(1);
        System.out.println(orderPO);
    }
}

控制台输出：
OrderPO(id=1, orderId=2, userId=3, createTime=2023-02-27T13:31:43, updateTime=2023-02-27T17:59:30)