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Visual Basic Global Variables as Query Parameters
Our programming team has 15 members containing a wide variety of technical database knowledge and programming experience. We are kind of like Allstate Insurance - 'we have seen it before'.
We create databases large and small. Some of our databases help run entire small businesses including travel agencies and airline reservation systems. We also handle unique businesses such as fly rod manufacturing. Did you know there are 11 steps in the making of a fly rod?
Using global variables to pass user selection criteria to queries is a useful programming technique to master.
This Access download will provide you
with all the forms, modules, queries and VBA code to get you started.
Here is the SQL query code used in the example:
SELECT M_Student_Courses.Student_ID, L_Students.Student, L_Courses.Course
In the code above, get_global is a custom query function that passes back the value of any global variable you have defined. In this case we are retrieving the GBL_Student_ID which was previously selected as a parameter in the form below.
Note that you can create and use custom VBA functions in queries just as you use custom public functions in regular VBA code. These custom function can perform complex recordset operations that are not normally available in access queries. Complex scalar functions can be implemented with simple VBA custom functions. The get_global function is just a simple example of these query functions. There are other methods for returning global variables, such as the Eval function, however we find this custom method more reliable and flexible.
Global Variables as Query
Parameters downloadable Access example a try.
See the following additional in-site resources for global variables:
Using Access Visual Basic global variables programming Microsoft Access - VB script code help, samples.
Visual Basic Global
Variables as Query Parameters
MS Access 2003
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