<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.2</version>
</dependency>
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope>
</dependency>

#1、数据库连接信息配置
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
#2、开启下划线的表字段映射为驼峰格式的实体类属性
#mybatis.configuration.map-underscore-to-camel-case=true
#3、用于指定xml文件的位置（使用xml执行sql语句的方式时）
mybatis.mapper-locations=classpath:mapper/*.xml
#4、打印sql语句
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

@Builder
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {private long id;private String name;private int age;private Date createTime;private Date updateTime;
}

public class UserBuilder  implements ProviderMethodResolver {public String deleteUserSql() {return new SQL() {{DELETE_FROM("user");WHERE("ID = ${id}");}}.toString();}public static String selectUserById() {return new SQL().SELECT("name,age,create_time,update_time").FROM("user").WHERE("id = #{id}").toString();}
}

/*** 使用语句构造器方式定义数据库操作接口*/
@Mapper
public interface UserMapperWithBuilder {@SelectProvider(type = UserBuilder.class)User selectUserById(long id);
}

@SpringBootApplication
@Slf4j
@MapperScan("com.shumile.springbootmybatis.mapper")
//@EnableTransactionManagement
public class SpringBootMybatisApplication implementsApplicationRunner {@Autowiredprivate UserMapperWithAnnotation userMapperWithAnnotation;@Autowiredprivate UserMapperWithXml userMapperWithXml;@Autowiredprivate UserMapperWithBuilder userMapperWithBuilder;public static void main(String[] args) {SpringApplication.                run(SpringBootMybatisApplication.class, args);
}@Override@Transactionalpublic void run(ApplicationArguments args) throws Exception {//testByMapper();testByXml();//testBuilder();}private void testBuilder(){userMapperWithBuilder.selectUserById(18l);}private void testByXml() {Map<String, Object> map = new HashMap<>();map.put("name","小米");map.put("age",17);List<User> userList = userMapperWithXml.getUserList(map);userList.forEach(user->log.info("user:{}",user));}private void testByMapper() {User c = User.builder().name("小米").age(17).createTime(new Date()).updateTime(new Date()).build();int count = userMapperWithAnnotation.save(c);log.info("Save {} User: {}", count, c);c = userMapperWithAnnotation.findById(c.getId());log.info("Find User: {}", c);}
}

@MapperScan("com.shumile.springbootmybatis.mapper")

@SpringBootApplication
@Slf4j
@MapperScan("com.shumile.springbootmybatis.mapper")
public class SpringBootMybatisApplication implementsApplicationRunner {@Autowiredprivate UserMapperWithAnnotation userMapperWithAnnotation;@Autowiredprivate UserMapperWithXml userMapperWithXml;@Autowiredprivate UserMapperWithBuilder userMapperWithBuilder;public static void main(String[] args) {SpringApplication.                run(SpringBootMybatisApplication.class, args);
}@Override@Transactionalpublic void run(ApplicationArguments args) throws Exception {//testByMapper();testByXml();//testBuilder();}private void testBuilder(){userMapperWithBuilder.selectUserById(18l);}private void testByXml() {Map<String, Object> map = new HashMap<>();map.put("name","小米");map.put("age",17);List<User> userList = userMapperWithXml.getUserList(map);userList.forEach(user->log.info("user:{}",user));}private void testByMapper() {User c = User.builder().name("小米").age(17).createTime(new Date()).updateTime(new Date()).build();int count = userMapperWithAnnotation.save(c);log.info("Save {} User: {}", count, c);c = userMapperWithAnnotation.findById(c.getId());log.info("Find User: {}", c);}
}