SpringBoot整合Mybatis-Plus

Mybatis-Plus官方推荐在SpringBoot工程中使用，Spring过程自然也是可以用的，这里我只介绍SpringBoot的使用

（1）引入依赖

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    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- MyBatisPlus -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.0</version>
        </dependency>
        <!-- mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

（2）yml文件配置

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# 数据源
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql:///mybatis?serverTimezone=UTC
    username: root
    password: root


#日志格式
logging:
  pattern:
    console: '%d{HH:mm:ss.SSS} %clr(%-5level) ---  [%-15thread] %cyan(%-50logger{50}):%msg%n'

（3）编写Mapper接口，继承BaseMapper

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public interface UserMapper extends BaseMapper<user> {

}

（4）添加#MapperSan注解，扫描Mapper文件夹

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@SpringBootApplication
@MapperScan("com.gq.springnootdemo.mapper")
public class SpringnootdemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringnootdemoApplication.class, args);
    }

}

（5）测试方法

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@SpringBootTest
class SpringnootdemoApplicationTests {

    @Autowired
    private UserMapper userMapper;
    @Test
    void contextLoads() {
        user users = userMapper.selectById(1);
        System.out.println(users);
    }

}