hibenrnate的HQL查询注意

比如这是一条正确的HQL语句：      
   String queryString="select new com.dio.blog.dto.UserListDto(fu.username,fu.nickName,fu.url,fu.level,fu.charactor,fua.fid,fua.realName) from FriendUser fu,FriendUserAssociation fua where fu.id in(select fuab.fid from FriendUserAssociation fuab where fuab.uid=?)and fu.id=fua.fid and fua.uid=?";
如果这样写就会报错：     
     String queryString="select new com.dio.blog.dto.UserListDto(fu.username,fu.nickName,fu.url,fu.level,fu.charactor,fua.fid,fua.realName) from FriendUser fu,FriendUserAssociation fua where fu.id in(select FriendUserAssociation .fid from FriendUserAssociation fuab where FriendUserAssociation .uid=?)and fu.id=fua.fid and fua.uid=?";

这个例子说明：HQL查询时，如果要查询表中的字段，只能用别名。，不能用类名；