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判断SQL SERVER 服务是否断开
unit DTDem;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, Psock, NMDayTim, ExtCtrls, ComCtrls;
type
TForm1 = class(TForm)
Panel1: TPanel;
Edit1: TEdit;
Edit2: TEdit;
Label1: TLabel;
Label2: TLabel;
NMDayTime1: TNMDayTime;
Button1: TButton;
Label3: TLabel;
StatusBar1: TStatusBar;
procedure Button1Click(Sender: TObject);
procedure NMDayTime1Connect(Sender: TObject);
procedure NMDayTime1Disconnect(Sender: TObject);
procedure NMDayTime1HostResolved(Sender: TComponent);
procedure NMDayTime1Status(Sender: TComponent; Status: String);
procedure NMDayTime1ConnectionFailed(Sender: TObject);
procedure NMDayTime1InvalidHost(var handled: Boolean);
private
{ Private declarations }
public
{ Public declarations }
end;
const
StdCap = 'The Current Date and Time is : ';
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
begin
NMDayTime1.ReportLevel := Status_Basic; //控制数量，Status_Basic=2。
NMDayTime1.TimeOut := 300; //控制时间，以毫秒为单位。
NMDayTime1.Host := Edit1.Text; //主机的名称或远程主机的IP地址。
NMDayTime1.Port := StrToInt(Edit2.Text); //主机的端口。
Label3.Caption := StdCap+NMDayTime1.DayTimeStr;//显示时间。
end;
//连接远程主机，此事件发生。
procedure TForm1.NMDayTime1Connect(Sender: TObject);
begin
StatusBar1.SimpleText := 'Connected'; //显示连接
end;
//和远程的主机没连接上，此事件发生。
procedure TForm1.NMDayTime1Disconnect(Sender: TObject);
begin
If StatusBar1 <> nil then
StatusBar1.SimpleText := 'disconnected'; //显示断开连接。
end;
//当远程的主机地址被断然拒绝，此事件发生。
procedure TForm1.NMDayTime1HostResolved(Sender: TComponent);
begin
StatusBar1.SimpleText := 'Host resolved';
end;
//一些状态改变时，此事件发生。
procedure TForm1.NMDayTime1Status(Sender: TComponent; Status: String);
begin
If StatusBar1 <> nil then
StatusBar1.SimpleText := status;
end;
//连接失败，此事件发生。
procedure TForm1.NMDayTime1ConnectionFailed(Sender: TObject);
begin
ShowMessage('Connection Failed');
end;
//主机出毛病，此事件发生。
procedure TForm1.NMDayTime1InvalidHost(var handled: Boolean);
var
TmpStr: String;
begin
If InputQuery('Invalid Host!', 'Specify a new host:', TmpStr) then
Begin
NMDayTime1.Host := TmpStr;
Handled := TRUE;
End;
end;
end.
要使用TNMDayTime控件。
AdoQquery1.Sort = '字段名称 ASC'
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