unit stu;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DBTables, DB, ExtCtrls, StdCtrls, Mask, DBCtrls, Grids, DBGrids,
  Buttons;

type
  TForm2 = class(TForm)
    DataSource1: TDataSource;
    DataSource2: TDataSource;
    Query1: TQuery;
    Query2: TQuery;
    Query3: TQuery;
    Query4: TQuery;
    Query5: TQuery;
    Table1: TTable;
    Panel1: TPanel;
    Label1: TLabel;
    Label2: TLabel;
    DBEdit1: TDBEdit;
    DBEdit2: TDBEdit;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Edit1: TEdit;
    DBEdit3: TDBEdit;
    DBEdit4: TDBEdit;
    que: TBitBtn;
    BitBtn2: TBitBtn;
    DBGrid1: TDBGrid;
    DBNavigator1: TDBNavigator;
    xuan: TBitBtn;
    tui: TBitBtn;
    Label6: TLabel;
    stringGrid1: TStringGrid;
    procedure Edit1Enter(Sender: TObject);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure xuanClick(Sender: TObject);
    procedure cSelectCell(Sender: TObject; ACol, ARow: Integer;
      var CanSelect: Boolean);
   procedure tuiClick(Sender: TObject);
    procedure FormShow(Sender: TObject);
   procedure queClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;
 i,j :integer ;
  sacol,sarow :integer;
  acno :array[1..5,1..4] of string ;
  snum : string ;

implementation

{$R *.dfm}

procedure TForm2.Edit1Enter(Sender: TObject);
begin
  edit1.text:='';
  dbedit1.text:='';
  dbedit2.text:='';
  for i:=1 to 5 do
    for j:=1 to 4 do
      begin
        stringGrid1.Cells[i,j]:= '' ;
        acno[i,j]:='';
      end;
  query5.close;
  xuan.enabled:=false;
  tui.enabled:=false;

end;

procedure TForm2.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
 if (key=#13) and (Edit1.Text<>'') then
    que.Click;


end;

procedure TForm2.xuanClick(Sender: TObject);
begin
 if table1cquato.value:=table1cnum.value then
  begin
    showmessage('沒有名額');
    exit;
  end ;
 sacol:=table1ctime.value div 10;
  sarow:=table1ctime.value- sacol*10 ;
  if stringGrid1.Cells[sacol,sarow]<>'' then
  begin
    showmessage('時間沖突');
    exit;
  end;
  try
    query3.close;
    query3.parambyname('sno').value:=snum ;
    query3.parambyname('cno').value:=table1cno.value;
    query3.execsql;
  except
    showmessage('該課程已修');
    exit;
  end;
  stringGrid1.Cells[sacol,sarow]:=table1cname.value;
  acno[sacol,sarow]:=table1cno.value;
  Table1.Edit ;
  Table1cnum.value:=table1cnum.value+1;
  Table1.Post ;
  query5.close;
  query5.open;
end;

procedure TForm2.StringGrid1SelectCell(Sender: TObject; aCol,
  aRow: Integer; var CanSelect: Boolean);
begin
  sacol:=acol;
  sarow:=arow;

procedure TForm2.FormShow(Sender: TObject);
begin
  stringGrid1.Cells[0,1]:= '第一節(jié)' ;}
  stringGrid1.Cells[0,2]:= '第二節(jié)' ;
  stringGrid1.Cells[0,3]:= '第三節(jié)' ;
  stringGrid1.Cells[0,4]:= '第四節(jié)' ;
  stringGrid1.Cells[0,5]:= '第五節(jié)' ;
  stringGrid1.Cells[0,6]:= '第六節(jié)' ;
  stringGrid1.Cells[0,7]:= '第七節(jié)' ;
  stringGrid1.Cells[1,0]:= '星期一' ;
  stringGrid1.Cells[2,0]:= '星期二' ;
  stringGrid1.Cells[3,0]:= '星期三' ;
  stringGrid1.Cells[4,0]:= '星期四' ;
  stringGrid1.Cells[5,0]:= '星期五' ;
  edit1.SetFocus;

end;

procedure TForm2.queClick(Sender: TObject);
begin
   snum:=edit1.text;
  query1.close;
  query1.sql.Clear;
  query1.sql.add('select sname from student');
  query1.sql.add('where sno='''+edit1.text+'''');
  query1.open;
  if query1.fieldbyname('sname').asstring='' then
    showmessage('學號有誤')
  else
    begin
      dbEdit1.text:=query1.fieldbyname('sname').value;
      query1.close;
      query1.sql.Clear;
      query1.sql.add('select sum(credit) from sc,course');
      query1.sql.add('where sno=''' + edit1.text+'''');
      query1.sql.add('and sc.cno=course.cno and grade>=60');
      query1.open;
      dbedit2.text:=query1.Fields[0].asstring;
      query5.close;
      query5.ParamByName('sno').value:=snum;
      query5.open;
      query2.close;
      query2.ParamByName('sno').value:=snum;
      query2.open;
  While not query2.EOF do
  begin
    sacol:=query2ctime.value div 10 ;
    sarow:=query2ctime.value - sacol*10 ;
    stringGrid1.Cells[sacol,sarow]:=query2cname.value ;
    acno[sacol,sarow]:=query2cno.value;
    query2.Next;
  end;
  xuan.enabled:=true;{打開選課，退課按鈕}
  tui.enabled:=true;

end;

end;

procedure TForm2.cSelectCell(Sender: TObject; ACol,ARow: Integer; var CanSelect: Boolean);
begin
sacol:=acol;
sarow:=arow;

end;

procedureTForm2.tuiClick(Sender: TObject);
begin
   if stringGrid1.Cells[sacol,sarow]='' then
    begin
      showmessage('請選擇退選課程');
      exit;
    end ;
  query4.close;
  query4.parambyname('sno').value:=snum;
  query4.parambyname('cno').value:=acno[sacol,sarow];
  query4.execsql;{打開query4}
  table1.locate('cno',acno[sacol,sarow],[]);
  Table1.Edit ;
 Table1cnum.value:=table1cnum.value-1;
  Table1.Post ;
  stringGrid1.Cells[sacol,sarow]:='' ;
  acno[sacol,sarow]:='' ;
  query5.close;
  query5.open
 end;
 end;
end.