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2¡¢»­²¼²»ÔÊÐí»æ»­£¨Canvas does not allow drawing£©£»ËùÒÔ£¬±ØÐëͨ¹ýSynchronize¹ý³ÌÀ´Í¨ÖªÖ÷Ï̷߳ÃÎÊÖ÷´°ÌåÉϵÄÈκοؼþ¡£
3¡¢²»ÄÜʹÓÃÖ÷ADOÁ¬½Ó£¨Main TADoConnection cannot be used!£©£»ËùÒÔ£¬Ïß³ÌÖв»ÄÜʹÓÃÖ÷Ïß³ÌÖÐTADOConnection¶ÔÏó£¬Ã¿¸öÏ̱߳ØÐë´´½¨×Ô¼ºµÄÊý¾Ý¿âÁ¬½Ó¡£
     Delphi2007°²×°ºóÔÚX:\Program Files\Common Files\CodeGear Shared\DataĿ¼ÏÂÓÐÒ»¸ödbdemos.mdbÎļþ£¬ÓÃÀ´×÷Ϊ²âÊÔµÄÀý×Ó¡£dbdemos.mdbÖеÄcustomer±í±£´æÁ˿ͻ§ÐÅÏ¢£¬orders±íÖб£´æÁ˶©µ¥ÐÅÏ¢¡£
       ²âÊÔ³ÌÐòÁ÷³Ì´óÖÂÊÇÕâÑùµÄ£ºÔÚÖ÷´°ÌåÉÏ·ÅTADOConnectionºÍTQuery¿Ø¼þ£¬Æô¶¯Ê±Õâ¸öTQuery´ÓCustomer±íÖвé³ö¿Í»§±àÂëCustNoºÍ¹«Ë¾Ãû³ÆCompany£¬·Åµ½Èý¸öCombox¿òÖУ¬·Ö±ðÔÚÈý¸öÁбí¿òÖÐÑ¡¶¨¿Í»§¹«Ë¾Ãû³Æ£¬°´ÕÕ¹«Ë¾Ãû³ÆËù¶ÔÓ¦µÄ¿Í»§´úÂ뽨Á¢Èý¸öÏß³ÌͬʱÔÚorders±íÖвéѯÏúÊÛÈÕÆÚSaleDate·Ö±ðÌîÈëListBoxÖС£
{Ö÷´°Ìå´úÂë}
unit Main;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, ADODB, StdCtrls;

type
TForm2 = class(TForm)
ComboBox1: TComboBox;
ComboBox2: TComboBox;
ComboBox3: TComboBox;
ListBox1: TListBox;
ListBox2: TListBox;
ListBox3: TListBox;
Button1: TButton;
ADOConnection1: TADOConnection;
ADOQuery1: TADOQuery;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form2: TForm2;

implementation

uses ADOThread;

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
const
SQL_CONST='Select SaleDate from orders where CustNo = %d';
var
c1,c2,c3:Integer;
s1,s2,s3:string;
begin
//È¡µÃÈý¸öÑ¡Ôñ¿ò¿Í»§µÄ±àÂë
c1:=Integ


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