springboot整合mybatis学习笔记

1. 添加依赖

   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>1.3.2</version>
   </dependency>
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
   </dependency>
   

2. 启动类添加注解@MapperScan

   @MapperScan("com.yicj.study.webflux.mapper")
   @SpringBootApplication
   public class WebFluxApp {
         
         
       public static void main(String[] args) {
         
         
           SpringApplication.run(WebFluxApp.class, args) ;
       }
   }
   

3. 添加配置

   # datasource 配置
   spring.datasource.driver-class-name=com.mysql.jdbc.Driver
   spring.datasource.url=jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT
   spring.datasource.username=root
   spring.datasource.password=root
   # mybatis 配置
   mybatis.config-location=classpath:mybatis-config.xml
   logging.level.com.yicj.study.webflux.mapper=debug
   

4. 新建resources/mybatis-config.xml文件

   <?xml version="1.0" encoding="UTF-8" ?>
   <!DOCTYPE configuration
           PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
           "http://mybatis.org/dtd/mybatis-3-config.dtd">
   <configuration>
       <!--类型别名配置-->
       <typeAliases>
          <package name="com.yicj.study.webflux.entity"/>
       </typeAliases>
       <!--配置MyBatis 去哪里找映射文件-->
       <!--注意如果这里使用package的话路径一定要与java的mapper接口路径一致，否则将找不到xml文件-->
       <mappers>
           <!--
           如果使用package 这里必须配置为com.yicj.study.mapper，且xml文件必须存放在对应路径下
           <package name="com.yicj.study.mapper"/>
           -->
           <mapper resource="mappers/UserMapper.xml" />
       </mappers>
   </configuration>
   

5. 新建resources/mappers/UserMapper.xml文件

   <?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.yicj.study.webflux.mapper.UserMapper">
       <select id="findById" resultType="User" parameterType="int">
           select * from user where id = #{id}
       </select>
   </mapper>
   

6. 新建mapper类

   public interface UserMapper {
         
         
       User findById(Integer id) ;
   }