maindatamoduleunit.~pas

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unit MainDataModuleUnit;

interface

uses
  SysUtils, Classes, ADODB, DB, Forms, Windows;

type
  TMainDataModule = class(TDataModule)
    MainADOConnection: TADOConnection;
    MainADODataSet: TADODataSet;
    MainADOQuery: TADOQuery;
    DataSource1: TDataSource;
    procedure MainADOConnectionBeforeConnect(Sender: TObject);
    procedure DbConnect;
    procedure DataModuleCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  MainDataModule: TMainDataModule;

implementation

{$R *.dfm}

procedure TMainDataModule.MainADOConnectionBeforeConnect(Sender: TObject);
begin
  MainADOConnection.ConnectionString := 'File NAME='+ExtractFilePath(Application.ExeName)+'db.udl';
end;

procedure TMainDataModule.DataModuleCreate(Sender: TObject);
begin
  DbConnect;
end;

procedure TMainDataModule.DbConnect;
begin
  try
    MainADOConnection.Connected := True;
  except
    MessageBox(Application.Handle,'数据库连接失败，请检查数据库连接设置','',MB_OK);
    raise;
  end;
end;

end.