Some Introductory Programming

1. Structured Query Language (SQL)

- used for queries.

- a standard database product.

2. Visual Basic for Applications

- use of Visual Basic to develop an Access application.

The Access Design Screen version of a Query

Show all students with an overall mark less than 40%

The Access SQL version of the query

Run the Query

Example of Visual Basic programming.Calculate outcome, put in field on record.

A table contains student number, name, coursework mark, exam mark and an empty field for the result (pass or referred).

Module Total = 75% coursework + 25% exam which is shown in a calculated field on the form.

Result : 40% or over = Pass, otherwise Referred.

Exam Mark – Properties

OnExit – Code Builder

Enter code as below.

Note “Text 10” = module total as calculated on form.

Text 10 Properties.

Enabled = No (To disallow entry – module total is always calculated by computer).

Run the Form (Enter data)

Let’s add an Exit button

Add a Command Button, call it Exit

Use Wizard to specify Close Form action.

Sub Exit_button_Click ()On Error GoTo Err_Exit_button_Click

DoCmd Quit

Exit_Exit_button_Click: Exit Sub

Err_Exit_button_Click: MsgBox Error$ Resume Exit_Exit_button_Click

End Sub

The Wizard will insert the following code as an OnClick event procedure:

Sub Exit_button_Click ()On Error GoTo Err_Exit_button_Click

continue = MsgBox("Do you really want to quit?", 4)

If continue = 6 Then DoCmd Quit End If

Exit_Exit_button_Click: Exit Sub

Err_Exit_button_Click: MsgBox Error$ Resume Exit_Exit_button_Click

End Sub

Add three extra lines to give the following:

New lines

Access now asks for confirmation before closing the form.