向导开发，自动导入依赖
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.2</version> </dependency>搞定数据源Druid，省略
注解版 @Mapper public interface DepartmentMapper { @Select("SELECT * FROM department WHERE id=#{id}") public Department getDeptById(Integer id); @Delete("DELETE FROM department WHERE id=#{id}") public int deleteById(Integer id); @Options(useGeneratedKeys = true,keyProperty = "id") @Insert("INSERT INTO department (`departmentName`) VALUES (#{departmentName})") public int insertDept(Department department); public int updateDept(Department department); } @RestController public class DeptController { @Autowired DepartmentMapper departmentMapper; @GetMapping("/dept/{id}") public Department getDeptment(@PathVariable("id") Integer id){ return departmentMapper.getDeptById(id); } @GetMapping("/dept") public Department insertDept(Department department){ departmentMapper.insertDept(department); return department; } }
主程序入口
@MapperScan(value = "com.howl.springboot.mapper")重点配置文件(要在主配置文件中配置) mybatis: config-location: classpath:mybatis/mybatis-config.xml mapper-locations: classpath:mybatis/mapper/*
19. 最后一点SpringBoot启动原理
创建SpringApplication对象
保存主配置类 判断是否web应用 从类路径下找applicationContextInitializer然后保存起来 从类路径下找applicationContextListener然后保存起来 从多个配置类中找到main方法的主配置类运行run方法
获取SpringapplicationRunListeners：从类路径下META-INF下spring.factories 回调所有的获取获取SpringapplicationRunListeners.starting()方法 封装命令行参数 准备环境：IOC环境，eg:profile 创建环境后回调SpringapplicationRunListeners.environmentprepared():表示环境准备完成 创建IOC容器 准备上下文： environment保存到IOC中 而且要执行applyInitalizers()方法（上面创建应用的时候就拿到了所有的Initializer），回调里面全部方法 回调所有的Listeners的contextPrepared(); 回调所有的Listeners的contextLoaded（）方法 刷新容器：IOC容器初始化，加载组件（配置类、@bean）,还有嵌入式容器 从IOC获取所有的ApplicationRunner和CommandRunner参考来自
https://www.bilibili.com/video/BV1bb411A7bD