APEX BASICS

Apex is a strongly typed object-oriented programming language

It allows the developers to execute flows and transaction control statements.- Apex enables Developers to add business logic to most system events like button clicks related record updates and visualforce pages.

Apex language

1. Integrated: It provides built-in support for DML calls.2. Inline Salesforce object query language.3. Easy to use.4. Easy to test.5. Version6. Multitenant aware.

When Should I use Apex:

- To create email service- Perform complex validation over multiple objects.- To create a complex business process that is not supported by the workflow.- Create a custom transaction logic.- Attach custom logic to another operation.

How does Apex work :

All apex programs run entirely On-demand on Force.com platform where you demand and salesforce will provide you.

First, the platform application server compiles the code into an abstract set of instructions that can be understood by apex runtime interpreter.

• The compiled code is stored in metadata.
• When the end-user triggers the execution of apex by clicking button or visualforce page the application server retrieves the compiled instructions from the metadata and send them to runtime interpreter before returning the result.

These are the basics of why and when to use apex in salesforce 

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