procedure Tcpya_app.FormCreate(Sender: TObject);
begin
datamodule2.tree.close;
datamodule2.tree.sql.clear;
datamodule2.tree.sql.add('select name from plat order by name');
datamodule2.tree.Active:=true;
datamodule2.tree.Open;
while not datamodule2.tree.Eof do
begin
with tv.Items do
begin
MyTreeNode1 := Add(nil,trim(datamodule2.tree.fields[0].asstring));//增加根节点
with datamodule2 do
begin
child.close;
child.SQL.Clear;
child.SQL.Add('select comp from dalei where plat='''+Trim(datamodule2.tree.Fields[0].asstring)+''''+' order by comp');
child.Active:=true;
child.Open;
While Not child.Eof do
begin
TV.Items.AddChild(mytreenode1,trim(child.Fields[0].AsString));
child.Next;
end; end;
datamodule2.tree.Next;
end;
end;
end;
在添加和删除前必须保证有节点被选中(Treeview.Selected= nil)
用Add，如：MyTreeNode1 := Add(nil,trim(datamodule2.tree.fields[0].asstring));
在添加子节点时用addchild(父节点，子节点名），
但在添加大量的数据的时候 最好使用
TreeView.Items.BeginUpdate;
添加节点
TreeView.Items.EndUpdate
删除节点
Treeview.Selected.Delete
编辑节点内容
Treeview.Selected.EditText 
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