getQueryLocator vs. Iterator in Apex
Summary
In Salesforce batch Apex, the start method requires choosing between Database.getQueryLocator and Iterable<sObject> to fetch data. Most developers opt for getQueryLocator, but knowing when to implement an Iterator is a key skill that separates senior from junior developers. This insight helps improve batch processing strategies by guiding efficient data retrieval choices, impacting overall performance and scalability.
Takeaways
- Use Database.getQueryLocator for straightforward bulk queries in batch Apex.
- Implement Iterable and Iterator for more control over data retrieval in batch processing.
- Choosing the right data fetching method can optimize batch job performance.
- Understanding these options distinguishes more experienced Apex developers.
- Evaluate batch job requirements to select between getQueryLocator and Iterator.
When you write a Batch class in Salesforce, the start method asks you a fundamental question: “How should I get the data?” You have two options: Database.getQueryLocator or Iterable<sObject>. While 90% of developers default to getQueryLocator, understanding when and why to use an Iterator distinguishes a senior developer from a junior one. Let’s break down […] The post getQueryLocator vs. Iterator in Apex appeared first on Apex Hours .