有个数据库结构id fatherid text
2 0 总类
3 2 军事
4 2 文化
5 2 教育
6 3 空军
7 3 陆军
8 5 大学
9 8 北京大学
现想用递归的方法把 TEXT的字段内容分层次的在TTreeView里显示出来如何做?
2 0 总类
3 2 军事
4 2 文化
5 2 教育
6 3 空军
7 3 陆军
8 5 大学
9 8 北京大学
现想用递归的方法把 TEXT的字段内容分层次的在TTreeView里显示出来如何做?
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for instance:type
PMyRec = ^TMyRec;
TMyRec = record
FName: string;
LName: string;
end;Assuming these types are used, the following code adds a node to TreeView1 as the last sibling of a specified node. A TMyRec record is associated with the added item. The FName and LName fields are obtained from edit boxes Edit1 and Edit2. The Index parameter is obtained from edit box Edit3. The item is added only if the Index is a valid value.procedure TForm1.Button1Click(Sender: TObject);var
MyRecPtr: PMyRec;
TreeViewIndex: LongInt;
begin
New(MyRecPtr);
MyRecPtr^.FName := Edit1.Text;
MyRecPtr^.LName := Edit2.Text;
TreeViewIndex := StrToInt(Edit3.Text);
with TreeView1 do
begin
if Items.Count = 0 then
Items.AddObject(nil, 'Item' + IntToStr(TreeViewIndex), MyRecPtr)
elseif (TreeViewIndex < Items.Count) and (TreeViewIndex >= 0) then
Items.AddObject(Items[TreeViewIndex], 'Item' + IntToStr(TreeViewIndex), MyRecPtr); end;
end;After an item containing a TMyRec record has been added, the following code retrieves the FName and LName values associated with the item and displays the values in a label.procedure TForm1.Button2Click(Sender: TObject);begin
Label1.Caption := PMyRec(TreeView1.Selected.Data)^.FName + ' ' +
PMyRec(TreeView1.Selected.Data)^.LName;
end;
////////////////////////////////////////////////////////////////////////
AddChildObject:
TreeView1.Items.AddChildObject(TreeView1.Selected,'New Item',MyBitMap);
//--------------------------------------------------------------------
addprocedure TForm1.Button1Click(Sender: TObject);var
MyTreeNode1, MyTreeNode2: TTreeNode;
begin
with TreeView1.Items do
begin
Clear; { remove any existing nodes }
MyTreeNode1 := Add(nil, 'RootTreeNode1'); { Add a root node }
{ Add a child node to the node just added }
AddChild(MyTreeNode1,'ChildNode1'); {Add another root node}
MyTreeNode2 := Add(MyTreeNode1, 'RootTreeNode2');
{Give MyTreeNode2 to a child }
AddChild(MyTreeNode2,'ChildNode2'); {Change MyTreeNode2 to ChildNode2 }
{ and add a child node to it}
MyTreeNode2 := TreeView1.Items[3];
AddChild(MyTreeNode2,'ChildNode2a'); {Add another child to ChildNode2, after ChildNode2a }
Add(MyTreeNode2,'ChildNode2b'); {add another root node}
Add(MyTreeNode1, 'RootTreeNode3');
end;end;