用递归生成树
表结构是id,preid,text,用递归生成多层树型目录.
String ReturnString(int i)
{
String str_a;
String strsql= "select * from table where prid ="+id;
rs->exec(strsql)
while (rs->next()) {
str_a += rs->getstring("text");
String str_id = rs->getstring("id");
ReturnString(str_id);
}
return str_a
}
我用这个只能返回单层的.怎么返回多层的,高手指点哈