Learning Salesforce Lightning Application Development

Lightning Data Service

If we have multiple custom components on a page with its own Apex controller, we can easily repeat SOQL queries.

Let's take a look at a scenario wherein multiple components have their own SOQL query, and there is no data sharing between components, as illustrated in the following diagram:

Lightning Data Service provides the following advantages: 

• Introduces the sharing of data via a common cache implementation.
• Avoids the need to write Apex, and also takes care of CRUD/FLS and DML security settings configured by the administrator.

The following diagram shows how the data flow is simplified with Lightning Data Service, ...