1.创建模块环境

1. 创建模块，勾选 Spring Initializr 并配置相关基础信息

2. 选择当前模块所需要的技术集（MyBatis、MySQL）

2.测试

1. 编写 application.yml 配置文件

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/tb_band?serverTimezone=UTC
    username: root
    password: root

2. 定义实体类

public class Book {
    private Integer id;
    private String name;
    private String type;
    private String description;
}

2. 定义 dao 接口，添加注解 @Mapper

@Mapper
public interface BookDao {
    @Select("select * from tb_book where id=#{id}")
    Book getById(Integer id);
}

3. 定义测试类

@SpringBootTest
class Demo2ApplicationTests {

    @Autowired
    private BookDao bookDao;

    @Test
    void contextLoads() {
        Book book = bookDao.getById(1);
        System.out.println(book);
    }

}

3.使用 Druid 数据源

1. 导入 Druid 依赖

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
     <version>1.1.16</version>
</dependency>

2. 编写 application.yml 配置文件，添加 type

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/tb_band?serverTimezone=UTC
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource