Spring Boot 集成Mybatis操作数据库

项目结构

    

pom配置

   org.mybatis.spring.boot
   mybatis-spring-boot-starter
   1.1.1




   mysql
   mysql-connector-java
   5.1.39

application.properties 

#MySQL
spring.datasource.url=jdbc:mysql://localhost:3307/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/
#mybatis.mapper-locations = classpath*:com/demo/mapper/*.xml
mybatis.mapper-locations = com/demo/mapper/*.xml

logging.level.sample.mybatis.mapper=TRACE

CityService.java

/**
 * City业务类
 *
 * @author [email protected]
 * @date 2017/1/9 14:59
 */
@Service()
// @Transactional
public class CityService extends BaseService {

    @Autowired
    private CityMapper cityMapper;

    @Autowired
    private CityDao cityDao;

    /**
     * 通过注解的形式查询数据库
     *
     * @return
     */
    public City selectOneCityByStateUseAnnotation() {
        return cityMapper.selectOneCityByState("CA1");
    }

    /**
     * 使用@Mapper映射XML 查询数据
     *
     * @return
     */
    public City selectOneCityByIdUseMapper(long id) {
        return cityMapper.selectOneCityById(id);
    }

    /**
     * 使用XML的形式查询数据库
     *
     * @return
     */
    public City selectOneCityByIdUseXML(long id) {
        return cityDao.selectOneCityById(id);
    }
}

CityDao.java 传统的sqlSession方式

/**
 * CityDao 使用sqlSession的形式查询数据
 *
 * @author [email protected]
 * @date 2017/1/9 14:52
 */
@Component
public class CityDao {
    @Autowired
    private SqlSession sqlSession;

    public City selectOneCityById(long id) {
        return this.sqlSession.selectOne("selectOneCityById", id);
    }

}

CityMapper.java 注解的方式

/**
 * CityMapper 直接使用注解的形式查询数据库
 *
 * @author [email protected]
 * @date 2017/1/9 14:57
 */
@Mapper
public interface CityMapper {

    /**
     * sql直接使用注解 不使用xml形式
     *
     * @param state
     * @return
     */
    @Select("select * from city where state = #{state}")
    City selectOneCityByState(@Param("state") String state);

    /**
     * 使用xml形式，xml id默认为方法名
     *
     * @param id
     * @return
     */
    City selectOneCityById(long id);

}

CityMapper.xml

xml version="1.0" encoding="UTF-8" ?>
"-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
namespace="com.demo.mapper.CityMapper">

    id="selectOneCityById" resultType="com.demo.model.City">
        select * from city where id = #{id}
    

CityServiceTest.java

@RunWith(SpringRunner.class)
@SpringBootTest
public class CityServiceTest {

    @Autowired
    private CityService cityService;

    /**
     * 使用注解查询数据库
     */
    @Test
    public void selectOneCityByStateUseAnnotationTest() {
        City city = cityService.selectOneCityByStateUseAnnotation();
        System.out.println(city.toString());
    }

    /**
     * 使用@Mapper映射XML 查询数据
     */
    @Test
    public void selectOneCityByIdUseMapperTest() {
        City city = cityService.selectOneCityByIdUseMapper(2);
        System.out.println(city.toString());
    }

    /**
     * 使用XML的形式查询数据库
     */
    @Test
    public void selectOneCityByIdUseXMLTest() {
        City city = cityService.selectOneCityByIdUseXML(2);
        System.out.println(city.toString());
    }

}

---

参考

         mybatis-spring-boot-autoconfigure

代码

         https://github.com/JeromeSuz/demo_spring_boot