spring boot 中mybtis数据持久层的引入

spring boot 中mybatis数据持久层的引入

1. maven加载依赖

<!--数据库连接池-->
 <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid-spring-boot-starter</artifactId>
     <version>1.2.9</version>
 </dependency>
 <!--mysql的java客户端连接器-->
 <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>8.0.28</version>
 </dependency>
 <!--数据持久层-->
 <dependency>
     <groupId>com.baomidou</groupId>
     <artifactId>mybatis-plus-boot-starter</artifactId>
     <version>3.5.0</version>
 </dependency>

2. application.yml

server:
  port: 8008
spring:
  application:
    name: netty-demo
  datasource:
    druid:
      username: root
      password: 123456
      url: jdbc:mysql://172.xx.xxx.194:3306/iwo
      driver-class-name: com.mysql.cj.jdbc.Driver
mybatis-plus:
  configuration:
    map-underscore-to-camel-case: false
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  mapper-locations: classpath:/mapper/**/*.xml # 如果将Mapper.xml放在resources文件夹下可以省略
#  type-aliases-package: com.example.netty.domain.pojo # 简化resultType的全限定名

3. 在启动类中引入对应的mapper接口

@SpringBootApplication
@MapperScan("com.example.netty.dao")
public class NettyApplication {
    public static void main(String[] args) {
        SpringApplication.run(NettyApplication.class, args);
    }
}

4. 创建pojo实体对象以及Mapper接口
   

5. 在resources文件下，创建Mapper.xml文件
   
   入口文件执行@MapperScan先扫描mapper接口，然后再加载mapper.xml映射文件