delphi 根据数据库结构生成TreeView
procedure TUIOperate.FillTree(treeview: TTreeView); var findq: TADOQuery; node: TTreeNode; //这个方法是根据记录的id字段值,查找TreeView上的父节点 function FindParentNode(id:Integer):TTreeNode; var i:Integer; begin Result := nil; for i := 0 to treeview.Items.Count - 1 do begin //比较Node的Data值和记录的id值 if Integer(treeview.Items[i].Data) = id then begin Result := treeview.Items[i]; Break; end; end; end; begin findq := TADOQuery.Create(nil); findq.Connection := controler.DataConnect.Connection; //这里的Connection指向你的数据连接 try treeview.Items.BeginUpdate; treeview.Items.Clear; //选出所有记录,并按parentid排序,这样可以保证先添加顶级节点,在下级记录添加时,总能找到父节点 findq.SQL.Text := \'SELECT * FROM [Catalog] order by parentid,id\'; findq.Open; while not findq.Eof do begin //如果是最顶级,直接添加到Treeview if findq.FieldByName(\'parentid\').AsInteger = -1 then //将id值,保存在Node的Data中,以便查找用 treeview.Items.AddObject(nil,findq.FieldByName(\'CatalogName\').AsString,Pointer(findq.FieldByName(\'id\').AsInteger)) else begin //查找上级节点 node := FindParentNode(findq.FieldByName(\'parentid\').AsInteger); if node <> nil then treeview.Items.AddChildObject(node,findq.FieldByName(\'CatalogName\').AsString,Pointer(findq.FieldByName(\'id\').AsInteger)); end; findq.Next; end; finally findq.Free; treeview.Items.EndUpdate; end; end;
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