Document

Really basic

Apex allow us to write custom code to make the salesforce app act really like we want (or at least our AMOA really want :/)

Apex is really a Java like language, and with this language we can manipulate data, make transaction in SF database and work with API and webservice.

Essentials classes

In Salesforce framework, some classes are really recurrent and often if not always used when we developping custom functionalities.

Database Class

Database provides methods for performing database operations (querying and manipulating records).

Database.insert(records, allOrNone) : It insert one or more record in database.
Database.update(records, allOrNone) : It update one or more records in database.
Database.delete(records, allOrNone) : It delete one or more records. They're still in the recycly bin BTW.
Database.query(queryString) => Execute a dynamic SOQL query and return the result.

System Class

System class provides static methods and properties for interacting with the Apex runtime environment.

System.debug(String|Records|Objects) : It display log message in the debug console.
System.assert(condition, message) : It verify that the specified condition is true.
System.now() => return the current date and time in the GMT time zone.
System.runAs(User) => Allow to run a block of code as a specific user.
System.today() => return the current date in the GMT time zone.
System.schedule()

Schema Class

Schema class allow interacting with the database schema, like list of field of an object, or get type of fields.

Schema.SObjectType.ObjectName : provides access to the schema information for the named Object.
Schema.describeSObjects(List<String>) : returns schema information for theses SObjects.

A Basic conception with Salesforce

When developping with salesforce, we can often use a basic approach to respond our needs

In salesforce, the layout can mostly (and should mostly) be configured by XML and by the Lightning App Builder that provides drag and drop interface.

The layout will allow the standard user to make action, like create, update, delete records. Click on a button and make a web services call

All of this will trigger apex code, either by standard trigger, or by LWC call to apex classes.

When the project will growing, we could add some abstraction to better manage this codes. And that in my humble opinion the most enjoyable thing of this framework as a developper ^^!