spring boot mybatis无配置文件注解版

相关配置：注解版在 application.properties 只需要指明实体类的包路径即可。mybatis.type-aliases-package=com.example.domain

public interface UserMapper {

    @Select("select * from user limit 10")
    @Results({
            @Result(property = "userId",  column = "user_id"),
            @Result(property = "userName", column = "user_name"),
            @Result(property = "mobile", column = "mobile"),
    })
    List getUsers();
}

测试

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

    private MockMvc mockMvc;
    @Autowired
    private WebApplicationContext context;
//  @Autowired
//  private WebController webController;

    @Before
    public void setUp() throws Exception {
        mockMvc = MockMvcBuilders.webAppContextSetup(context).build();
//      mockMvc = MockMvcBuilders.standaloneSetup(new DemoController()).build();
//      mockMvc = MockMvcBuilders.standaloneSetup(webController).build();
    }


    @Test
    public void getUsers() throws Exception {
        mockMvc.perform(MockMvcRequestBuilders.post("/getUsers")).andDo(MockMvcResultHandlers.print());
    }

测试成功

动态 SQL
如果我们需要写动态的 SQL，或者需要写复杂的 SQL，全部写在注解中会比较麻烦，MyBatis 还提供了另外的一种支持。

首先定义一个 UserSql 类，提供方法拼接需要执行的 SQL：

@Slf4j
public class UserSql {
    public String getUsers(Map userParam) {

        StringBuffer sql = new StringBuffer("select  user_id as userId, user_name as userName");
        sql.append(" from user where 1=1 ");
        if (userParam != null) {
            if (StringUtils.isNotBlank(userParam.get("userName"))) {
                sql.append(" and userName = #{userName}");
            }
        }
        log.info("getList sql is :" +sql.toString());
        return sql.toString();
    }
}


public interface UserMapper {

//    @Select("select * from loan_user limit 10")
//    @Results({
//            @Result(property = "userId",  column = "user_id"),
//            @Result(property = "userName", column = "user_name"),
//            @Result(property = "mobile", column = "mobile"),
//    })
    @SelectProvider(type = UserSql.class, method = "getUsers")
    List getUsers(Map userParam);
}

测试成功