main.pas

一个很简单的三层数据库程序,包括毕业论文, 因为简单,所以容易供参考学习!

unit main;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, jpeg, ExtCtrls, Menus, DB, ADODB,adoconed,inifiles;

type
  TFmMain = class(TForm)
    Image1: TImage;
    PopupMenu1: TPopupMenu;
    N1: TMenuItem;
    ADOConnection1: TADOConnection;
    MainMenu1: TMainMenu;
    N2: TMenuItem;
    N3: TMenuItem;
    procedure N1Click(Sender: TObject);

    procedure N3Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public

    { Public declarations }
  end;

var
  FmMain: TFmMain;
  myinifile:Tinifile;
implementation

uses data, config;

{$R *.dfm}

procedure TFmMain.N1Click(Sender: TObject);
begin
application.Terminate;
end;



procedure TFmMain.N3Click(Sender: TObject);
var
  filename:string;
begin
  filename:=ExtractFilePath(paramstr(0))+'dbconf.ini';
  myinifile:=Tinifile.Create(filename);
  ADOConnection1.Close;
  EditConnectionString(ADOConnection1);
  myinifile.WriteString('dbconf','connectstring',adoconnection1.ConnectionString);
  myinifile.Free;
end;

procedure TFmMain.FormCreate(Sender: TObject);
var
   filename:string;
begin
   filename:=ExtractFilePath(paramstr(0))+'dbconf.ini';
   myinifile:=Tinifile.Create(filename);
   adoconnection1.ConnectionString:=myinifile.ReadString('dbconf','connectstring','');
   try
     adoconnection1.Connected:=true;
   except //当没有sql联接时使用access联接
     adoconnection1.ConnectionString:='Provider=Microsoft.Jet.OLEDB.4.0;Data Source='+ExtractFilePath(Application.Exename)
     +'back\图书馆管理系统.mdb;Persist Security Info=False';
     adoconnection1.Connected:=true;
   end;
   if adoconnection1.Connected=false then
   showmessage('数据库存连接错误');
end;

end.


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