Mybatis-plus 一對多關聯查詢，附JRebel熱加載mapper.xml

1 public class Person extends PersonOthers{} 2 public class PersonOthers{private List<Map<String,String>> otherList;}

 1 public class PersonService {  2 
 3  @Resource  4     private PersonDao dao;  5     
 6     public List<Person> selectPlusQuery(QueryPersonDto query, Page<Person> page) {  7         String sql = "SELECT * FROM t_person_info";  8         QueryWrapper<Person> qw = new QueryWrapper<>();  9         if (null != query) { 10             String keyword = query.getKeyword(); 11             if (StringUtils.isNotBlank(keyword)) qw.like("person_name", keyword); 12  } 13         return dao.selectPlusQuery(sql, page, qw); 14  } 15 }

@Service

@Repository public interface PersonDao { /** * Mybatis註解 + xml(無法省？) + mybatis-plus 條件查詢、分頁 * @param sql 自定義sql * @param page 分頁查詢 * @param queryWrapper mybatis-plus條件構造器 */ @Results({ @Result(property = "otherList", javaType = List.class, column = "pid" ,many = @Many(select = "selectOtherByPid")) }) @Select("${sql} ${ew.customSqlSegment}") List<Person> selectPlusQuery(@Param("sql") String sql, Page<Person> page, @Param(Constants.WRAPPER) QueryWrapper<Person> queryWrapper); }

@Mapper

<resultMap id="BaseResultMap" type="*.Person">
    <id column="id" property="id"/>
    <result column="pid" property="pid"/>
    <!-- ... -->
    <collection property="otherList" javaType="List" ofType="map" select="selectOtherByPid" column="pid">
        <!-- javaType：對應Person屬性otherList的類型,能夠不寫; ofType：對應嵌套sql中的resultType; select: 對應文件中的select標籤id; column：對應主表中的字段（嵌套sql中的參數字段：#{pid}）; -->
    </collection>
</resultMap>
<select id="selectOtherByPid" resultType="map"> SELECT * FROM t_other AS o WHERE o.pid = #{pid} </select>

mapper.xml

jrebel-mybatisplus 下載地址，而後在git命令窗依次執行如下命令：html

1 git clone */jrebel-mybatisplus.git 2 cd jrebel-mybatisplus 3 mvn -f pom.xml clean package

將構建好的插件jrebel-mybatisplus\target\jr-mybatisplus-*.jar拷貝至任意目錄dirjava

修改運行配置，增長VM參數:-Drebel.plugins=dir\jr-mybatisplus-*.jar，而後以JRebel方式啓動git

修改你項目中的mapper xml 文件後，從新編譯，若是從新請求接口，你應該會看到控制檯輸出「Reloading SQL maps」github

原文出處：https://www.cnblogs.com/andea/p/11692032.htmlsql