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ACC2000: How to Change the Database Password Through ADO

Article ID: 304915 - View products that this article applies to.

This article was previously published under Q304915

Advanced: Requires expert coding, interoperability, and multiuser skills.

This article applies only to a Microsoft Access database (.mdb).

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SUMMARY

With Microsoft Jet version 4.0, you can change the database password by running a data-definition query. Because you can do this, it is relatively easy to set the database password through ActiveX Data Objects (ADO).

This article shows you how to set the database password, and then how to resetting the database password to a blank password.

NOTE: To set or reset the database password, you must have the database open exclusively.

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MORE INFORMATION

Setting the Database Password

The following ADO example assumes that the current database has a blank database password.

NOTE: The sample code in this article uses Microsoft ActiveX Data Objects. For this code to run properly, you must reference the Microsoft ActiveX Data Objects 2.x Library (where 2.x is 2.1 or later.) To do so, click References on the Tools menu in the Visual Basic Editor, and make sure that the Microsoft ActiveX Data Objects 2.x Library check box is selected.

Create a module, and then type the following line in the Declarations section if it is not already there:
Option Explicit

Type the following procedure:

 
Sub ADOAddPW()
   Dim cn As ADODB.Connection
   Dim newpassword As String
   Dim NotValid As Integer
   Dim sqlExecStr As String

   Set cn = CurrentProject.Connection
   On Error Resume Next

   ' Test to see if the database is open exclusively.
   If cn.Mode <> 12 Then
      MsgBox "Your database is not opened exclusively", vbCritical
      Exit Sub
   End If
     
RetryPassword:
   newpassword = InputBox("Please enter new database password", "Database Password" _
        , "New Database Password")

' Select case for inputbox.
   
   Select Case newpassword
   
   ' Case where the cancel button was pressed.
   
    Case "New Database Password"
        MsgBox "No Database password set"
        Exit Sub
        
   ' Case where the OK button was pressed without entering data.
   
    Case ""
       NotValid = MsgBox("You have not entered a valid password, or clicked the cancel button" & Chr(10) & Chr(13) & _
       "Do you want to change the database password?", vbCritical + vbYesNo)
       If NotValid = 6 Then
        GoTo RetryPassword
       Else
        Exit Sub
       End If
       
    'If any data is entered other than the default value.
    
    Case Else
       sqlExecStr = "ALTER Database Password " & newpassword & "``"
       CurrentProject.Connection.Execute sqlExecStr
       MsgBox "Database password has been set"
                     
    End Select
      
End Sub

To test this function, click Run Sub/UserForm on the Run menu.
Close and then reopen the database. Note that you are prompted to enter the database password.

Resetting the Database Password to a Blank Password

You can use the following code sample to reset the password to a blank database password. To set the blank password, you must use the NULL keyword. This example also assumes that the current database has a database password set as DBPassword.

Create a module, and then type the following line in the Declarations section if it is not already there:
Option Explicit

Type the following procedure:

 
Sub ResetDBPassword()
   Dim cn As ADODB.Connection
   Dim sqlExecStr As String
   Dim ResetQuestion As Integer
   
   Set cn = CurrentProject.Connection
   On Error Resume Next
   
   ' Test to see if the database is open exclusively.
   If cn.Mode <> 12 Then
      MsgBox "Your database is not opened exclusively", vbCritical
      Exit Sub
   End If
   ResetQuestion = MsgBox("You have selected to reset the database" & _
            Chr(10) & Chr(13) & "to a blank password. Do you want to continue?", vbQuestion + vbYesNo, _
            "Reset Database Password")

    'Reset database password based on answer to message box.
    
    If ResetQuestion = 6 Then
        sqlExecStr = "ALTER DATABASE PASSWORD NULL [DBPassword]"
        CurrentProject.Connection.Execute sqlExecStr
        MsgBox "Database Password has been reset."
    Else
        MsgBox "Database password has not been reset"
        Exit Sub
    End If

End Sub

To test this function, click Run Sub/UserForm on the Run menu.
Close and then reopen the database. Note that you are not prompted to enter the old database password.

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REFERENCES

For additional information about other new features of Microsoft Jet 4.0, click the article number below to view the article in the Microsoft Knowledge Base:

275561

(http://support.microsoft.com/kb/275561/EN-US/ )

New Features in Microsoft Jet 4.0

For more information about data-definition queries, click Microsoft Access Help on the Help menu, type what is an sql query and when would you used one? in the Office Assistant or the Answer Wizard, and then click Search to view the topics returned.

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