Mybatis-plus 一对多关联查询,附JRebel热加载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注解 + xml(没法省?) + mybatis-plus 条件查询、分页 
     * @param sql   自定义sql
     * @param page  分页查询
     * @param queryWrapper  mybatis-plus条件构造器
     */
    @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:对应Person属性otherList的类型,可以不写;
                ofType:对应嵌套sql中的resultType;
                select: 对应文件中的select标签id;
                column:对应主表中的字段(嵌套sql中的参数字段:#{pid});
                -->
    </collection>
</resultMap>
<select id="selectOtherByPid" resultType="map">
    SELECT * FROM t_other AS o WHERE o.pid = #{pid}
</select>
mapper.xml

jrebel-mybatisplus 下载地址 ,然后在git命令窗依次执行以下命令:

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

将构建好的插件jrebel-mybatisplus argetjr-mybatisplus-*.jar拷贝至任意目录dir

修改运行配置,增加VM参数:-Drebel.plugins=dirjr-mybatisplus-*.jar,然后以JRebel方式启动


修改你项目中的mapper xml 文件后,重新编译,如果重新请求接口,你应该会看到控制台输出 “Reloading SQL maps”

原文地址:https://www.cnblogs.com/andea/p/11692032.html