In this tutorial, you will learn how to create functions in Progress 4GL (OpenEdge ABL), define input parameters, return values, and reuse business logic in QAD ERP Browse reports. This guide includes a complete real-world example and best practices for modular programming. Progress OpenEdge ABL (formerly known as Progress 4GL) is primarily a structured programming language, but it also supports modular programming through the use of functions and procedures. Modular programming allows developers to organize code into reusable components, making applications easier to maintain, understand, and scale. A simple way to understand modular programming is to compare it to a home theater system. The main controller represents the primary program, while the speakers, subwoofer, and audio devices represent functions, procedures, or subprograms. Each component has a specific responsibility and can be reused whenever needed. This approach reduces duplicate code and makes enterpri...
Hello developer friends! This week I want to talk about the ACCUM function in Progress 4GL . This function works similarly to the SQL SUM function. Both functions are used to consolidate or calculate the total value of a field based on specific conditions. For example, if you want to calculate the total invoiced sales amount by customer, the SQL statement would look like this: SELECT SUM(ih_invoicetotal), ih_bill FROM ih_hist WHERE ih_domain = 'domain' AND YEAR(ih_inv_date) = 2019 GROUP BY ih_bill Now, the same example written in Progress 4GL: FOR EACH ih_hist WHERE ih_domain = 'domain' AND YEAR(ih_inv_date) = 2019 NO-LOCK BREAK BY ih_bill: ACCUMULATE ih_invoicetotal (TOTAL BY ih_bill). IF LAST-OF(ih_hist.ih_bill) THEN DISPLAY ACCUM TOTAL BY ih_bill ih_invoicetotal ih_bill. END. As shown in the images, both approaches generate the same result. The Progress functions used in this example were: ...