how to make qr code generator in vb.net Part 7: After Completing Your Application in .NET framework

Generator USS Code 128 in .NET framework Part 7: After Completing Your Application

Part 7: After Completing Your Application
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Securing Your Database
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If IsNothing(Me.Password) Then MsgBox "You must enter a Password!", vbCritical, gstrAppTitle Cancel = True Me.Password.SetFocus Exit Sub End If ' Verify UserID If IsNothing(Me.UserID) Then MsgBox "You must enter a User ID!", vbCritical, gstrAppTitle Cancel = True Me.UserID.SetFocus Exit Sub End If ' Now validate the User ID Set ws = DBEngine(0) ' Local error trap On Error Resume Next ' See if the user exists ws.Users.Refresh Set usr = ws.Users(Me.UserID) ' If got an error, must add the user If Err <> 0 Then Err = 0 ' Create a new user Set usr = ws.CreateUser(Me.UserID, "9999", Me.Password) ws.Users.Append usr ' Make sure new user is at least a member of Employees Set grpU = usr.CreateGroup("Employees") usr.Groups.Append grpU ' .. and Users Set grpU = usr.CreateGroup("Users") usr.Groups.Append grpU ' If IsAdmin, then also add to AppAdmin and Admins group If (Me.IsAdmin = True) Then Set grpU = usr.CreateGroup("AppAdmin") usr.Groups.Append grpU Set grpU = usr.CreateGroup("Admins") usr.Groups.Append grpU End If ' Now see if department manager - but not on new record If Not IsNothing(Me.EmployeeNumber) Then varID = Null varID = DLookup("ManagerNumber", "tblDepartments", _ "ManagerNumber = " & Me.EmployeeNumber) If Not IsNull(varID) Then ' Found this ID as a manager - add to managers group Set grpU = usr.CreateGroup("DeptMgrs") usr.Groups.Append grpU Set grpU = usr.CreateGroup("Admins") usr.Groups.Append grpU End If End If Else
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Part 1: Part Title
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Part 7: After Completing Your Application
Microsoft Office Access 2003 Inside Out
' Got a good hit on user - did IsAdmin change If Me.IsAdmin = Me.IsAdmin.DefaultValue Then ' Reverse test in case of Null Else ' Admin changed - change the group membership If Me.IsAdmin Then ' Add Admin authority Set grpU = usr.CreateGroup("AppAdmin") usr.Groups.Append grpU Set grpU = usr.CreateGroup("Admins") usr.Groups.Append grpU Else ' Remove Admin authority usr.Groups.Delete "AppAdmin" ' Check if department manager varID = Null varID = DLookup("ManagerNumber", "tblDepartments", _ "ManagerNumber = " & Me.EmployeeNumber) If IsNull(varID) Then ' Not a department manager - also remove Admins usr.Groups.Delete "Admins" End If End If End If End If ws.Users.Refresh ws.Groups.Refresh Set grpU = Nothing Set usr = Nothing Set ws = Nothing ' Check to see if we need to supply an Employee Number ' This application does not use AutoNumber If IsNothing(Me.EmployeeNumber) Then ' Get the previous high number and add 1 varID = DMax("EmployeeNumber", "tblEmployees") + 1 ' If this is first one, then value will be null If IsNull(varID) Then varID = 1 Me.EmployeeNumber = varID End If End Sub
Part 1: Part Title
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The code uses the CreateUser and CreateGroup methods to accomplish the necessary changes in the workgroup file. Note that this code can run only when a user that is a member of the Admins group is signed on. This is why the code adds application administrators to the Admins group as well as one or both of the special application groups. The code uses the initial password defined for the new employee as the password for the new Access user name. However, there is no provision anywhere in the code to attempt to keep the password synchronized if someone changes the password in the employee record. You need to know the old password for a user to be able to change it, and only the user can change his or her own password. Also, a member of the Admins group could use the User and Group Accounts dialog box to reset the user s password, so any code that attempted to change the password later would break. 1194
Part 7: After Completing Your Application
Securing Your Database Note Before you distribute this application to users, you should create another workgroup file that has the HousingAdmin user (password secured), a user ID for each employee, and the three special groups. Be sure that the workgroup ID of this workgroup file does not match the one that you used to create the secured database. Application administrators and department managers will be members of the Admins group in this workgroup, so the code that adds new users will work properly. However, because the workgroup ID won t match the original owning workgroup ID, members of the Admins group won t be able to change user permissions. If you have been following along to this point, you can now return to the Database window, choose Startup from the Tools menu, and change the Display Form/Page setting to frmSplash. Close the database and quit Access. Restart Access and open the secured copy of the Housing Administration database. In the Logon dialog box that Access displays, enter KArcher in the Name box and password in the Password box and click OK. The application should start, and you should see the application s Housing Sample Sign On dialog box open with Karen Archer s name already chosen in the User Name combo box. The application won t let you change the User Name because it matches the Access user name that you used to open the database. Type password in the Password box and click Sign On. The application should display its main switchboard form. If you click Departments, you should see the record for the Sales department, and you can t move to any of the other department records. Because Karen is the manager of this department, you can change information about the department. Return to the main switchboard and click Employees. The form should open and display Karen s record. You can also use the navigation buttons to move to Stephen Mew s record the other employee in Karen s department but you can t see information about employees from any other department. As you can see, the desktop database security system is neither simple nor easy to implement. When you need to secure a desktop application, you should now know the steps you need to take to successfully secure a database and modify the code to work with security. Caution Before leaving this section, be sure you rejoin your standard workgroup file using the Workgroup Administrator program.
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