Записываем в Access, используя OLE DB

// Читаем Access`овскую базу используя ADO
// Проверяе являеться ли файл .mdb Access
// Записываем запись в базу
// Нужны компаненты-
//    TADOtable,TDataSource,TOpenDialog,TDBGrid,
//    TBitBtn,TTimer,TEditTextBox
program ADOdemo;
 
uses Forms, uMain in 'uMain.pas' {frmMain};
 
{$R *.RES}
 
begin
  Application.Initialize;
  Application.CreateForm(TfrmMain, frmMain);
  Application.Run;
end.
///////////////////////////////////////////////////////////////////
unit uMain;
 
interface
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Db, DBTables, ADODB, Grids, DBGrids, ExtCtrls, DBCtrls, StdCtrls, Buttons,
  ComObj;
 
type
  TfrmMain = class(TForm)
    DBGridUsers: TDBGrid;
    BitBtnClose: TBitBtn;
    DSource1: TDataSource;
    EditTextBox: TEdit;
    BitBtnAdd: TBitBtn;
    TUsers: TADOTable;
    BitBtnRefresh: TBitBtn;
    Timer1: TTimer;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure ConnectToAccessDB(lDBPathName, lsDBPassword: string);
    procedure ConnectToMSAccessDB(lsDBName, lsDBPassword: string);
    procedure AddRecordToMSAccessDB;
    function CheckIfAccessDB(lDBPathName: string): Boolean;
    function GetDBPath(lsDBName: string): string;
    procedure BitBtnAddClick(Sender: TObject);
    procedure BitBtnRefreshClick(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    function GetADOVersion: Double;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  frmMain: TfrmMain;
  Global_DBConnection_String: string;
const
  ERRORMESSAGE_1 = 'No Database Selected';
  ERRORMESSAGE_2 = 'Invalid Access Database';
 
implementation
 
{$R *.DFM}
 
procedure TfrmMain.FormCreate(Sender: TObject);
begin
  ConnectToMSAccessDB('ADODemo.MDB', '123'); // DBName,DBPassword
end;
 
procedure TfrmMain.ConnectToMSAccessDB(lsDBName, lsDBPassword: string);
var
  lDBpathName: string;
begin
  lDBpathName := GetDBPath(lsDBName);
  if (Trim(lDBPathName) <> '') then
    begin
      if CheckIfAccessDB(lDBPathName) then
        ConnectToAccessDB(lDBPathName, lsDBPassword);
    end
  else
    MessageDlg(ERRORMESSAGE_1, mtInformation, [mbOK], 0);
end;
 
function TfrmMain.GetDBPath(lsDBName: string): string;
var
  lOpenDialog: TOpenDialog;
begin
  lOpenDialog := TOpenDialog.Create(nil);
  if FileExists(ExtractFileDir(Application.ExeName) + '\' + lsDBName) then
    Result := ExtractFileDir(Application.ExeName) + '\' + lsDBName
  else
    begin
      lOpenDialog.Filter := 'MS Access DB|' + lsDBName;
      if lOpenDialog.Execute then
        Result := lOpenDialog.FileName;
    end;
end;
 
procedure TfrmMain.ConnectToAccessDB(lDBPathName, lsDBPassword: string);
begin
  Global_DBConnection_String :=
    'Provider=Microsoft.Jet.OLEDB.4.0;' +
    'Data Source=' + lDBPathName + ';' +
    'Persist Security Info=False;' +
    'Jet OLEDB:Database Password=' + lsDBPassword;
 
  with TUsers do
    begin
      ConnectionString := Global_DBConnection_String;
      TableName := 'Users';
      Active := True;
    end;
end;
 
// Check if it is a valid ACCESS DB File Before opening it.
 
function TfrmMain.CheckIfAccessDB(lDBPathName: string): Boolean;
var
  UnTypedFile: file of Byte;
  Buffer: array[0..19] of Byte;
  NumRecsRead: Integer;
  i: Integer;
  MyString: string;
begin
  AssignFile(UnTypedFile, lDBPathName);
  reset(UnTypedFile, 1);
  BlockRead(UnTypedFile, Buffer, 19, NumRecsRead);
  CloseFile(UnTypedFile);
  for i := 1 to 19 do
    MyString := MyString + Trim(Chr(Ord(Buffer[i])));
  Result := False;
  if Mystring = 'StandardJetDB' then
    Result := True;
  if Result = False then
    MessageDlg(ERRORMESSAGE_2, mtInformation, [mbOK], 0);
end;
 
procedure TfrmMain.BitBtnAddClick(Sender: TObject);
begin
  AddRecordToMSAccessDB;
end;
 
procedure TfrmMain.AddRecordToMSAccessDB;
var
  lADOQuery: TADOQuery;
  lUniqueNumber: Integer;
begin
  if Trim(EditTextBox.Text) <> '' then
    begin
      lADOQuery := TADOQuery.Create(nil);
      with lADOQuery do
        begin
          ConnectionString := Global_DBConnection_String;
          SQL.Text :=
            'SELECT Number from Users';
          Open;
          Last;
      // Generate Unique Number (AutoNumber in Access)
          lUniqueNumber := 1 + StrToInt(FieldByName('Number').AsString);
          Close;
      // Insert Record into MSAccess DB using SQL
          SQL.Text :=
            'INSERT INTO Users Values (' +
            IntToStr(lUniqueNumber) + ',' +
            QuotedStr(UpperCase(EditTextBox.Text)) + ',' +
            QuotedStr(IntToStr(lUniqueNumber)) + ')';
          ExecSQL;
          Close;
      // This Refreshes the Grid Automatically
          Timer1.Interval := 5000;
          Timer1.Enabled := True;
        end;
    end;
end;
 
procedure TfrmMain.BitBtnRefreshClick(Sender: TObject);
begin
  Tusers.Active := False;
  Tusers.Active := True;
end;
 
procedure TfrmMain.Timer1Timer(Sender: TObject);
begin
  Tusers.Active := False;
  Tusers.Active := True;
  Timer1.Enabled := False;
end;
 
function TfrmMain.GetADOVersion: Double;
var
  ADO: OLEVariant;
begin
  try
    ADO := CreateOLEObject('adodb.connection');
    Result := StrToFloat(ADO.Version);
    ADO := Null;
  except
    Result := 0.0;
  end;
end;
 
procedure TfrmMain.Button1Click(Sender: TObject);
begin
  ShowMessage(Format('ADO Version = %n', [GetADOVersion]));
end;
 
end.

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