unit12.pas

本系统为学生管理系统,可实现选课和退选

unit Unit12;

interface

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

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

var
  CheckForm: TCheckForm;
    str: string;
implementation
uses unit5;
{$R *.dfm}

procedure TCheckForm.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 TCheckForm.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 TCheckForm.Button1Click(Sender: TObject);
var i:integer;
begin
try
memo1.text:=listbox1.Items[listbox1.itemindex];
if (listbox1.count-1)>0   then
begin
        for i:=0 to   listbox1.count-1  do
       memo1.text:=memo1.text+','+listbox1.Items[i]
end;
except
        showmessage('未选择正确字段');
end;
end;
procedure TCheckForm.BitBtn1Click(Sender: TObject);
begin
        str:=memo1.text;
        showmessage(str);
        checkform.Close;
end;

end.