请教数据库连TREEVIEW的问题 若有一个表字段名分别包含index_id、parent_id、index_name字段,index_name将在树型控件的节点上显示,index_id字段保存节点的唯一标识号,parent_id表示当前节点的父节点号,若只有2层结构关系,能否告知具体代码?是不是一定要用指针? 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, DB, ADODB, ComCtrls, StdCtrls;type TForm1 = class(TForm) ADOConnection1: TADOConnection; ADOQuery1: TADOQuery; TreeView1: TTreeView; procedure FormShow(Sender: TObject); private { Private declarations } procedure newtreeview(Node:TTreeNode;ParentID:integer); public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}procedure TForm1.newtreeview(Node:TTreeNode;ParentID:integer);var tmpNode : TTreeNode; ADOquery1 : TADOQuery;begin ADOQuery1 := TADOQuery.Create(self); ADOQuery1.Connection := ADOConnection1; ADOQuery1.close; ADOQuery1.SQL.clear; ADOQuery1.SQL.Text := 'select * from City where Parent_ID ='+inttostr(ParentID); ADOQuery1.open; if ADOQuery1.recordcount > 0 then begin ADOQuery1.First; while not ADOQuery1.Eof do begin tmpNode := TreeView1.Items.AddChild(Node,ADOQuery1.FieldByName('Field_Name').AsString); Newtreeview(tmpNode,ADOQuery1.FieldByName('Index_ID').AsInteger); ADOQuery1.next; end; end; ADOQuery1.Free;end;procedure TForm1.FormShow(Sender: TObject);begin newtreeview(nil,0);end;end. 送分的 delphi中将string转化为array ACCESS数据表 select 多表查询问题 怎么用api函数,把字符串复制到剪贴板并且清除? 关于数据类型的一个问题,清高手解答 Delphi 高手展示才能的地方~~~~ 200分求:《Delphi6企业级解决方案及应用剖析》电子书和光盘源程序!!!! 对DELPHI有兴趣的朋友进来看看 ;) WOCKET多线程编程如何实现自己的线程代码??? 什么情况下应该使用线程? 新手总是会使用一些"画蛇添足"的东西~ delphi2006 and access 将字符串转换为char 调试程序时报错,错误如下: 这是什么原因呢?
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, ADODB, ComCtrls, StdCtrls;type
TForm1 = class(TForm)
ADOConnection1: TADOConnection;
ADOQuery1: TADOQuery;
TreeView1: TTreeView;
procedure FormShow(Sender: TObject);
private
{ Private declarations }
procedure newtreeview(Node:TTreeNode;ParentID:integer);
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.newtreeview(Node:TTreeNode;ParentID:integer);
var
tmpNode : TTreeNode;
ADOquery1 : TADOQuery;
begin
ADOQuery1 := TADOQuery.Create(self);
ADOQuery1.Connection := ADOConnection1;
ADOQuery1.close;
ADOQuery1.SQL.clear;
ADOQuery1.SQL.Text := 'select * from City where Parent_ID ='+inttostr(ParentID);
ADOQuery1.open;
if ADOQuery1.recordcount > 0 then
begin
ADOQuery1.First;
while not ADOQuery1.Eof do
begin
tmpNode := TreeView1.Items.AddChild(Node,ADOQuery1.FieldByName('Field_Name').AsString);
Newtreeview(tmpNode,ADOQuery1.FieldByName('Index_ID').AsInteger);
ADOQuery1.next;
end;
end;
ADOQuery1.Free;
end;procedure TForm1.FormShow(Sender: TObject);
begin
newtreeview(nil,0);
end;end.