Introduction

When developing customizations in Acumatica, especially when preparing for ISV solution certification, it is important to follow best practices to ensure optimal performance and meet Acumatica's standards. One common issue that developers face is the PX1049 warning, which occurs when database queries or BQL statements are executed in the RowSelected event handler. This diagnostic warning signals potential performance problems, as the RowSelected event can be triggered multiple times for a single data record.

In this article, we'll explore how to fix the PX1049 warning while still being able to access the data from the database when necessary, particularly when dealing with custom fields on the screen after the details table for a row is loaded.

What is PX1049?

The PX1049 warning indicates that BQL statements and other database queries should be avoided in the RowSelected event handlers. The problem arises because these queries are repeatedly executed each time the event is triggered, which can lead to performance issues. According to Acumatica's best practices, queries should be moved outside of the RowSelected event handler to avoid this problem.

Diagnostic Description

Executing BQL statements in RowSelected events can lead to performance degradation due to multiple invocations of the event for a single data record. However, in some cases, like when you need to make decisions based on data from the database (e.g., assigning custom fields), this might seem unavoidable.

In those cases, the recommended approach is to use PXContext.SetSlot and PXContext.GetSlot to temporarily store necessary data and avoid executing queries directly in the RowSelected event.

Fixing the PX1049 Warning

The solution to this problem lies in managing database access more effectively. Specifically, you can use the PXContext.SetSlot method to store data temporarily in the context and retrieve it later when needed. This approach avoids direct queries in the RowSelected event and helps improve performance.

Let’s take a look at the implementation.

Example of Code That Results in the Warning

Consider the following example where a BQL query is executed directly in the RowSelected event:

In this example, the query to fetch the SOOrder based on the OrderNbr is executed directly in the RowSelected event, which can lead to performance issues and trigger the PX1049 warning.

Solution: Using PXContext.SetSlot and PXContext.GetSlot

Instead of executing the database query directly in the RowSelected event, you can use PXContext.SetSlot to store the data in the context and retrieve it when necessary. Below is the refactored code to fix the PX1049 warning.

Explanation

1. Using PXContext.SetSlot: In the RetrieveLogic method, the PXContext.SetSlot method is used to store the SOOrderExt extension for the sales order in the context.
2. Using PXContext.GetSlot: In the RowSelected event handler, we retrieve the stored extension using PXContext.GetSlot. This allows us to use the data without querying the database again.

By using this approach, we avoid executing BQL queries directly in the RowSelected event, resolving the PX1049 warning and improving performance.

Conclusion

The PX1049 warning is an important diagnostic that highlights performance risks due to database queries in the RowSelected event. While there are legitimate cases where data from the database is needed, Acumatica provides tools like PXContext.SetSlot and PXContext.GetSlot to handle this efficiently. By using these methods, developers can avoid executing database queries in the RowSelected event and ensure better performance in their customizations.

For more information, refer to the official Acumatica documentation on Data Manipulation Scenarios.