1. Access Lesson 13 Programming in Access Microsoft Office 2010 Advanced Cable / Morrison 1

2. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Objectives Create a new function. Test a new function. Add a control with defined names to a form. Create an If procedure. View the procedure results. Add an Else statement to a procedure. Test a revised procedure. 222

3. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Vocabulary code comment function procedure public syntax 333

4. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Introduction VBA is the programming language for Microsoft Office programs, including Access. VBA has a set of common features for all Microsoft Office programs. 4

5. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating a New Function A function is an action that can be defined in VBA code where you use statements to describe the action you want the function to perform. Code refers to the syntax, or wording, that is used in VBA. Access already has built-in functions, such as Average, Min, and Max. 5

6. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating a New Function (continued) If you want to use a function that is not built- in, you will need to define a new function. A variable name is a symbolic name that you assign to a value. You will need to assign a data type to the variables. 6

7. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating a New Function (continued) A comment is a statement that does not perform an action, but helps in identifying the purpose of the code. Defining a function in a module makes it accessible throughout the database, or public. 7

8. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating a New Function (continued) 8 Completed YearDiff function

9. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Testing a New Function After creating a new function, it is smart to check it to make sure the code is correct. Even the simplest functions can contain errors, such as spelling errors or logic errors. To test a function, you use the Immediate window. To test the function, type a question mark (?) before the function name and the variables. 9

10. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Testing a New Function (continued) 10 Answer appears in Immediate window

11. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Adding a Control with Defined Names to a Form You can add controls to a form that display the results of a calculation. To use a control in a procedure: – Add the control to the form – Assign specific names to the parts of the control in the Property Sheet 11

12. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating an If Procedure A procedure is a group of statements written in VBA code that can include several functions. Procedures include code that indicates where the procedure begins and additional code that tells where the procedure ends. The If procedure begins with the code word If and ends with the code words End If. 12

13. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating an If Procedure (continued) VBA requires the use of specific syntax so that the procedure performs actions correctly. If a procedure will be used in only one form, it will be entered as a private procedure. A public procedure can be used in several objects. 13

14. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Creating an If Procedure (continued) 14 Visual Basic window with procedure

15. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Viewing the Procedure Results After creating a procedure, you will need to view the results to be certain that the procedure is doing what you expect. If the procedure returns incorrect results, the syntax may not be entered correctly or may include a misspelled word. 15

16. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Adding an Else Statement to the Procedure In an If procedure, the procedure may look at a field and check to see if it contains a value. – If it does contain a value, the procedure continues – If it doesnt, the procedure ends You may want the procedure to perform a specific action if the field does contain a value and another action if it doesnt contain a value. 16

17. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Adding an Else Statement to the Procedure (continued) By placing an Else statement in the code, the procedure will perform one action or else it will perform another action. 17

18. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Adding an Else Statement to the Procedure (continued) 18 Revised procedure with Else statement

19. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Testing a Revised Procedure If a procedure has changed, you need to check it again. Review the results for several records to be sure that the procedure is working correctly. 19

20. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Summary In this lesson, you learned: If the function you want to use is not a built-in function, you will need to create a new function. After creating a new function, you will need to test the function to see if it produces the correct results. 20

21. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Summary (continued) You can add a control with defined names to a form. An If procedure starts with the If syntax and ends with the End If syntax. You should review the results of an If procedure to be certain that it is working correctly. 21

22. Access Lesson 13 Cable / MorrisonMicrosoft Office 2010 Advanced Summary (continued) You can add an Else statement to an If procedure. A revised procedure will need to be tested. 22