Скачать или смотреть Solving the “Sub or Function Not Defined” Error in Access VBA When Reading Recordset Fields

Learn how to resolve the “Sub or Function Not Defined” error in Access VBA by correcting function calls and understanding coding standards.
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Understanding the “Sub or Function Not Defined” Error in Access VBA

When working with Microsoft Access VBA, you may encounter various errors that can halt your progress. One such error is “Sub or Function Not Defined.” This error typically indicates a glitch in your code rather than a problem with the database itself. Recently, a user faced this dilemma when trying to read a recordset field, leading to confusion and frustration. If you find yourself in a similar situation, resolving this error is crucial to ensure your VBA code runs smoothly.

The Scenario

In the mentioned case, the user experienced the error when attempting to access the Received field from the RS_Logistics recordset. Despite confirming that the field exists in the IM_Logistics table, the error message prevented the code from executing as intended. Moreover, the user had been successfully working with recordsets for over a year, raising further questions about what changed and caused this issue to arise.

Diagnosing the Problem

Upon closer inspection, the root of the problem was not the recordset or the data it contained. Instead, the error was due to an incorrect function call in the VBA code. Specifically, the term Today() was being used instead of the correct VBA function, Date().

Key Findings:

Incorrect Function Usage: Today() does not exist in Access VBA. The correct function to get the current date is Date(), which is essential for date operations.

DateAdd Function Requirements: When using DateAdd, ensure the year interval is expressed as yyyy. Any other format can lead to unexpected behavior or errors.

The Solution

To resolve this issue, follow these steps to correct your code and eliminate the error:

Step 1: Replace the Incorrect Function

Locate every instance of Today() in your code and replace it with Date(). This adjustment will ensure you are using the correct built-in function for retrieving the current date.

Step 2: Check DateAdd Implementation

When using DateAdd, verify that you are providing the date parameters in a correct format:

[[See Video to Reveal this Text or Code Snippet]]

This line will now function correctly by calculating a date 10 years from today if ETA is Null.

Updated Portion of the Code

Here is how your modified code should look like:

[[See Video to Reveal this Text or Code Snippet]]

Things to Remember

Always double-check function names and make sure they exist in VBA.

Utilize the On Error statement to manage potential runtime errors effectively, as shown in the example above.

Conclusion

Encountering the “Sub or Function Not Defined” error in Access VBA can be frustrating, especially when you're confident in your application's setup. However, by understanding the underlying causes—such as incorrect function calls and parameter formats—you can quickly correct these issues and continue with your development tasks. Remember to enforce rigorous testing and validation of your code to catch these errors early on, resulting in more efficient and reliable database applications.

If you continue to face challenges in Access VBA, don't hesitate to consult additional resources or seek help from the developer community. Happy coding!