MySQL过程准备并执行错误

Question

我有一个工作程序：

   drop procedure if exists parents;
   create procedure parents(in related int(11),out counted int(11))
   begin
    drop temporary table if exists ids;
    create temporary table ids(id int(11));
    while related<>0 do
     select category.related into related from category where category.id=related;
     insert into ids(id) values(related);
    end while;
    select count(*) into counted from ids;
   end;

但我想创建一个动态表名。所以我想建立这样的东西：

   drop procedure if exists parents;
   create procedure parents(in related int(11),name varchar(22),out counted int(11))
   begin
    drop temporary table if exists ids;
    create temporary table ids(id int(11));
    while related<>0 do
     prepare statement from concat("select t.related into related from ",name," t where t.id=?");
     execute statement using related;
     insert into ids(id) values(related);
    end while;
    select count(*) into counted from ids;
   end;

但是我得到一个错误布尔错误。