1. Microsoft Access 2003 Illustrated Complete
Creating Modules and VBA

2. Objectives Understand modules and VBA Compare macros and modules
Create functions
Use If statements
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3. Objectives Document procedures Create class modules
Create sub procedures
Troubleshoot modules
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4. Understanding Modules
A module is an Access object that stores Visual Basic for Applications (VBA) programming code
VBA is written in the Visual Basic Editor Code window
Two kinds of modules:
Class module: contains VBA code stored in forms and reports
Standard module: contains global code that can be executed from anywhere in the database
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5. Understanding Modules
A module contains VBA code organized in procedures
A procedure is several lines of VBA code, each of which is called a statement
A module may contain comments
A procedure performs an operation or calculates an answer
A function is a procedure that returns a value
A sub (sub procedure) performs a series of VBA statements that manipulates an object or control
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6. Understanding Modules
In VBA, an object is any item that can be identified or manipulated
A method is an action that an object can perform
An event is a specific action that occurs on or to an object
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7. Understanding Modules
Object list
Procedure list
Declaration statements
Project Explorer Window
VBA code in Code window
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8. Elements in the Visual Basic Code window
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9. Comparing Macros and Modules
Both macros and modules help run your database efficiently
A macro is best suited to handle repetitive, simple tasks such as opening and closing forms
Macros are generally easier to create because you don’t have to know any programming syntax
To create a module, you must know a programming language, VBA
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10. Comparing Macros and Modules
You must use modules to create unique functions
Use VBA procedures to detect Access errors
VBA code stored in modules works with other Microsoft Office products
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11. Common VBA keywords
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12. Converting macros to Visual Basic
Click the Macros button on the Objects bar, then click the name of the macro you want to convert
If the macro is stored in a form or report, open the form or report in Design View, click the Tools menu, point to Macro, then click Convert Form’s (or Report’s) Macros to Visual Basic
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13. Creating Functions
Create a function to automate and simplify the unique calculations for your organization
Create a new function in a standard module so that it can be used in any query, form, or report in the database
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14. New function, EmployeePrice
Creating Functions
New function, EmployeePrice
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15. Using IF Statements
If…Then…Else logic allows you to test logical conditions and execute statements only if the conditions are true
End the If…Then…Else structure with an End If statement
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16. Using If Statements
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17. Documenting Procedures
Comment lines are statements in the code that document the code, and do not affect how the code runs
Comment lines start with an apostrophe (‘) and are green in the Code window
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18. Documenting Procedures
Comment lines
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19. Standard toolbar buttons in the Visual Basic window
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20. Creating Class Modules
Class modules are contained within forms and reports
Equipment Entry Form
CloseForm_Click() sub
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21. Creating Sub Procedures
If an event procedure, the name of the sub procedure contains the name of the object and event that triggers the code
Form_DblClick()
PrintButton_Click()
Form_Current()
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22. Creating Sub Procedures
Form_DblClick
PrintThisRecordButton_Click
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23. Troubleshooting Modules
Three types of errors.
Compile-time errors: occur as a result of incorrectly constructed code
Missing code or syntax error
Run-time errors: occur after the code starts to run
Include attempting an illegal operation
Logic errors: occur when the code runs without problems, but the procedure doesn’t produce the desired result
Hardest to troubleshoot
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24. Troubleshooting Modules
Use a breakpoint to stop code at a particular statement
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25. Summary
VBA stands for Visual Basic for Applications, the programming language that comes with Microsoft Office products
Use VBA to create new functions and automate processes
VBA is stored in standard and class modules
Class modules are stored in forms and reports
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