Visual Basic Tutorials:
|New! Download Access example of Global Variables as Query Parameters|
As this example show the declaration of a database global variable come right after the 'Option Compare Database' statement and before all declarations of (any) subroutines and functions within the form.
The definition of instance-wide Access global variables is carried out in a module. The following is the code we use to initialize our VBA global variables:
' Access global variables definition
Global GBL_Username As String
Global GBL_Previous_Tab As String
Public Sub Init_Globals()
' Access global variable initialization
GBL_Username = Environ("username")
GBL_Previous_Tab = " "
Then we make a call to the Init_Globals subroutine in our first-opening form as follows:
Private Sub Form_Open(Cancel As Integer)
As you can see there are many things you can keep track of with Access global variables. You can also do some neat tricks - like passing parameters to SQL queries using global variables.
Try our downloadable Access database demonstration of using Global variables as query parameters.
More Global Variable examples:
Global Variables as Query Parameters
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