querytrain.~pas

该程序不能实现全程售票

unit QueryTrain;

interface

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

type
  TQueryTrainFrm = class(TForm)
    GroupBox1: TGroupBox;
    RadioButton1: TRadioButton;
    RadioButton2: TRadioButton;
    RadioButton3: TRadioButton;
    RadioButton4: TRadioButton;
    RadioButton5: TRadioButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Button1: TButton;
    Button2: TButton;
    StringGrid1: TStringGrid;
    Edit5: TEdit;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  QueryTrainFrm: TQueryTrainFrm;
  count:integer;
implementation

uses Login;

{$R *.dfm}

procedure TQueryTrainFrm.Button1Click(Sender: TObject);
var query:string;
    i:integer;
begin
    begin
     with stringgrid1 do
       begin
        cells[0,0]:='车次号';
        cells[1,0]:='到站时间';
        cells[2,0]:='票价';
        cells[3,0]:='票余量';
        cells[4,0]:='到站';
        end;
 end;
   for i:=1 to count do
         begin
          with stringgrid1 do
           begin
            cells[0,i]:='';
            cells[1,i]:='';
            cells[2,i]:='';
            cells[3,i]:='';
            cells[4,i]:='';
            end;
           next;
         end;
    query:='';
    if Edit5.Text=''then
          showmessage('请输入查询时间')
    else
    if Radiobutton1.checked=true then
       if edit1.text='' then
          showmessage('请输入相应查询条件')
       else
          query:='select * from 车次 where trainnum like'+''''+'%'+edit1.text+'%'+''''+'and traindate='+''''+Edit5.Text+''''+'order by trainnum'
    else
    if Radiobutton2.checked=true then
       if edit2.text='' then
          showmessage('请输入相应查询条件')
       else
          query:='select * from 车次 where price like'+''''+'%'+edit2.text+'%'+''''+'and traindate='+''''+Edit5.Text+''''+'order by trainnum'
    else
    if Radiobutton3.checked=true then
       if edit3.text='' then
          showmessage('请输入相应查询条件')
       else
          query:='select * from 车次 where arrivetime like'+''''+'%'+edit3.text+'%'+''''+'and traindate='+''''+Edit5.Text+''''+'order by trainnum'
    else
    if Radiobutton4.checked=true then
          query:='select * from 车次 where passed  like'+''''+'%'+edit4.text+'%'+''''+'and traindate='+''''+Edit5.Text+''''+'order by trainnum'
    else
    if Radiobutton5.checked=true then
          query:='select * from 车次 order by trainnum '
     else
    showmessage('请您输入一个查询条件');
    if query<>'' then
    begin
     with LoginFrm.ADOQuery1 do
     begin
       close;
       sql.clear;
       sql.add(query);
       open;
       first;
       if recordcount=0 then
          begin
          showmessage('对不起，没有符合条件的查询结果！请重新查询！');
          edit1.setfocus;
          edit1.Text:='';
          edit2.Text:='';
          edit3.Text:='';
          edit4.Text:='';
          end
       else
        begin
         count:=recordcount;
         StringGrid1.RowCount:=recordcount+1;
         for i:=1 to recordcount do
         begin
          with stringgrid1 do
           begin
            cells[0,i]:=fieldbyname('trainnum').asstring;
            cells[1,i]:=fieldbyname('arrivetime').asstring;
            cells[2,i]:=fieldbyname('price').asstring;
            cells[3,i]:=fieldbyname('maxnum').asstring;
            cells[4,i]:=fieldbyname('passed').asstring;
            end;
         next;
        end;
        edit1.Text:='';
        edit2.Text:='';
        edit3.Text:='';
        edit4.Text:='';
       end;
   end;
  end;
end;


procedure TQueryTrainFrm.Button2Click(Sender: TObject);
var i:integer;
begin
       for i:=1 to count do
         begin
          with stringgrid1 do
           begin
            cells[0,i]:='';
            cells[1,i]:='';
            cells[2,i]:='';
            cells[3,i]:='';
            cells[4,i]:='';
            end;
           next;
         end;
       QueryTrainFrm.hide;
end;

end.