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Mastering Apex Programming

Mastering Apex Programming

By : Paul Battisson
4.9 (12)
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Mastering Apex Programming

Mastering Apex Programming

4.9 (12)
By: Paul Battisson

Overview of this book

As applications built on the Salesforce platform are now a key part of many organizations, developers are shifting focus to Apex, Salesforce’s proprietary programming language. As a Salesforce developer, it is important to understand the range of tools at your disposal, how and when to use them, and best practices for working with Apex. Mastering Apex Programming will help you explore the advanced features of Apex programming and guide you in delivering robust solutions that scale. This book starts by taking you through common Apex mistakes, debugging, exception handling, and testing. You'll then discover different asynchronous Apex programming options and develop custom Apex REST web services. The book shows you how to define and utilize Batch Apex, Queueable Apex, and Scheduled Apex using common scenarios before teaching you how to define, publish, and consume platform events and RESTful endpoints with Apex. Finally, you'll learn how to profile and improve the performance of your Apex application, including architecture trade-offs. With code examples used to facilitate discussion throughout, by the end of the book, you'll have developed the skills needed to build robust and scalable applications in Apex.
Table of Contents (21 chapters)
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1
Section 1 – Triggers, Testing, and Security
8
Section 2 – Asynchronous Apex and Apex REST
15
Section 3 – Apex Performance

Number of queries

Each query we run takes a small amount of time to run against the database and retrieve data. Although SOQL does not count against CPU time, the time taken can still be perceived by the user. For example, we can run up to 100 queries. If each takes 10 ms, this is an additional second of processing that occurs before our user can interact.

In Chapter 1, Common Apex Mistakes, we discussed why bulkification was important and you should not run triggers within loops. There are also a couple of simple ways in which you can reduce the number of queries you are running, which will help to reduce the amount of additional querying and processing, which we will discuss next.

Retrieving child records with a sub query

If retrieving a record and you require child records, consider using a sub query where appropriate to help retrieve all the necessary data at once. This is not always necessarily a good practice; for example, when determining the Batch Apex scope, it is...

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