unit13.pas

本系统为学生管理系统,可实现选课和退选

unit Unit13;

interface

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

type
  TForm13 = class(TForm)
    GroupBox1: TGroupBox;
    ComboBox1: TComboBox;
    ListBox1: TListBox;
    BitBtn1: TBitBtn;
    Memo1: TMemo;
    Button1: TButton;
    Table1: TTable;
    Label1: TLabel;
    Label2: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
  
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form13: TForm13;
implementation

uses Unit5;

{$R *.dfm}

procedure TForm13.FormCreate(Sender: TObject);
var i:integer;
begin

        combobox1.Clear;
        memo1.Text:='';
        for i:=0 to Form5.listbox2.Count-1 do
                combobox1.Items.Add(Form5.listbox2.Items[i]);
end;

procedure TForm13.ComboBox1Change(Sender: TObject);
var j:integer;
begin
      table1.Active:=false;
        table1.TableName:='';
        listbox1.Clear;
        table1.TableName:=combobox1.text;
         table1.Active:=true;
         for j:=0 to table1.FieldCount-1 do
                listbox1.Items.Add(table1.Fields[j].FieldName);

end;

procedure TForm13.Button1Click(Sender: TObject);

begin
try
begin
if memo1.text<>'' then
        memo1.text:=memo1.text+','+combobox1.Text+'.'+listbox1.items[listbox1.itemindex]
else
       memo1.Text:=memo1.Text+combobox1.Text+'.'+listbox1.items[listbox1.itemindex];


        showmessage(memo1.text);
end;
except
        showmessage('还未正确选择字段');

end;

end;

procedure TForm13.BitBtn1Click(Sender: TObject);
begin

  form13.close;

end;





end.