Solved

Protect access database with password

Posted on 2006-06-27
6
299 Views
Last Modified: 2010-04-16
Hi,

I need to protect a access database by password.
The user select the mdb file and my delphi code need to protect it by defined password.

How can I do that please ?

Jean-Luc !
0
Comment
Question by:Alphomega
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
6 Comments
 
LVL 10

Accepted Solution

by:
atul_parmar earned 125 total points
ID: 16991025
Import a Microsoft DAO type library. add it to your uses clause and then ...

var
  FEngine, FDB : OleVariant;
  DatabaseName, Password : String;
begin
  DatabaseName := 'c:\db1.mdb';
  Password := 'mypwd';
  FEngine := CoDBEngine.Create;
  FDB := FEngine.OpenDatabase(DatabaseName, True);
  FDB.NewPassword(#0, Password);
  FDB.Close;
  FDB := Unassigned;
  FEngine := Unassigned;
end;
0
 

Author Comment

by:Alphomega
ID: 16991545
Thanks for your code but when I'm trying to open a database, I get the error:

FDB := FEngine. OpenDatabase(DatabaseName, True);

---------------------------
Project1
---------------------------
Unrecognized database format 'c:\bd.mdb'
---------------------------
OK  
---------------------------

It's a real access 97 database ...
import typelib is
Type Lib: C:\Program Files\Fichiers communs\Microsoft Shared\DAO\DAO350.DLL

:-(

0
 
LVL 26

Assisted Solution

by:Russell Libby
Russell Libby earned 125 total points
ID: 16992735
Example using ADO that shows how to:

- set the initial password
- open a password protected db
- change a db password
- clear the  password from the db


Regards,
Russell

-----

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ComObj, ActiveX; // Include Variants for D6 and up

type
  TForm1         = class(TForm)
     Button1:    TButton;
     procedure   Button1Click(Sender: TObject);
  private
     // Private declarations
  public
     // Public declarations
  end;

var
  Form1:         TForm1;

implementation
{$R *.DFM}

const
  adModeShareExclusive =  12;

function UpdateDBPassword(FileMDB: String; OldPassword, NewPassword: String): Boolean;
var  ovConn:        OleVariant;
begin

  // Create ADO connection
  ovConn:=CreateOleObject('ADODB.Connection');
  try
     // Set exclusive mode
     ovConn.Mode:=adModeShareExclusive;
     try
        // Open the database
        ovConn.Open(Format('Provider=Microsoft.Jet.OLEDB.4.0;Data Source="%s";Jet OLEDB:Database Password="%s"', [FileMDB, OldPassword]));
        // Update the password
        ovConn.Execute(Format('ALTER DATABASE PASSWORD `%s` `%s`', [NewPassword, OldPassword]));
        // Close the connection
        ovConn.Close;
        // Success
        result:=True;
     except
        // Exception, return failure
        result:=False;
     end;
  finally
     // Clear the object reference
     ovConn:=Unassigned;
  end;

end;

function SetDBPassword(FileMDB: String; Password: String): Boolean;
var  ovConn:        OleVariant;
begin

  // Create ADO connection
  ovConn:=CreateOleObject('ADODB.Connection');
  try
     // Set exclusive mode
     ovConn.Mode:=adModeShareExclusive;
     try
        // Open the database
        ovConn.Open(Format('Provider=Microsoft.Jet.OLEDB.4.0;Data Source="%s"', [FileMDB]));
        // Update the password
        ovConn.Execute(Format('ALTER DATABASE PASSWORD `%s` NULL', [Password]));
        // Close the connection
        ovConn.Close;
        // Success
        result:=True;
     except
        // Exception, return failure
        result:=False;
     end;
  finally
     // Clear the object reference
     ovConn:=Unassigned;
  end;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin

  // Set initial password
  if SetDBPassword('c:\db1.mdb', 'Testing') then
  begin
     // Update password
     UpdateDBPassword('c:\db1.mdb', 'Testing', 'New Password');
     // Remove the password
     UpdateDBPassword('c:\db1.mdb', 'New Password', '');
  end;

end;

0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
This is a high-level webinar that covers the history of enterprise open source database use. It addresses both the advantages companies see in using open source database technologies, as well as the fears and reservations they might have. In this…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question