unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, ADODB, Grids, DBGrids;

type
  TForm1 = class(TForm)
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    ADOQuery2: TADOQuery;
    DataSource1: TDataSource;
    DataSource2: TDataSource;
    RDB_SQL: TRadioButton;
    RDB_Access: TRadioButton;
    DBGrid1: TDBGrid;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    procedure RDB_SQLClick(Sender: TObject);
    procedure RDB_AccessClick(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
  private
    { Private declarations }
  public

  function SelectADO(ADOX:integer):TADOQuery;
    { Public declarations }
  end;

var
  Form1: TForm1;
  DatabaseType:integer;
  UseADOQueryX:TADOQuery;
implementation

{$R *.dfm}

{Please remember set the DataSet property for DataSource and set the SQL property for ADOQuery
 Use the same name of the database and table
 the SQL Server table structure is the same as the Access tables}

function TForm1.SelectADO(ADOX:integer):TADOQuery;   //select the ADOQuery
begin
  if ADOX=1 then
    Result:=ADOQuery1
  else
    Result:=ADOQuery2;
end;

procedure TForm1.RDB_SQLClick(Sender: TObject);
var
  YourServerName:string;
begin
  ADOConnection1.Connected:=false;
  ADOConnection1.ConnectionString:='';

  YourServerName:='MARKING_MA\MARKING_MA';//This my SQL_Server name

  ADOConnection1.ConnectionString:='Provider=SQLOLEDB.1;Integrated Security=SSPI;'+
                                   'Persist Security Info=False;Initial Catalog=master;'+
                                   'Data Source='+YourServerName;

  ADOConnection1.DefaultDatabase:='master';
  ADOConnection1.Connected:=true;
  DatabaseType:=1;
  ADOQuery1.Open;
  DBGrid1.DataSource:=DataSource1;
end;

procedure TForm1.RDB_AccessClick(Sender: TObject);
begin
with ADOConnection1 do
begin
  Connected:=false;
  ConnectionString:='';
  ConnectionString:='Provider=Microsoft.Jet.OLEDB.4.0;'+
                               'Data Source=Test.mdb;Persist Security Info=False';
  DefaultDatabase:='';
  Connected:=true;
  Provider:='Microsoft.Jet.OLEDB.4.0';
end;
  DatabaseType:=2;
  ADOQuery2.Open;
  DBGrid1.DataSource:=DataSource2;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  UseADOQueryX:=SelectADO(DatabaseType);
    with UseADOQueryX do
    begin
      Append;
    end;
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  UseADOQueryX:=SelectADO(DatabaseType);
  UseADOQueryX.Post;
end;

end.