Monday, July 18, 2016

Apex Basic and Database : What is Apex ?


Note: All credit goes to Salesforce, I am just a developer who enjoy playing trailhead and try to make note to myself.

What is Apex?

programming language that uses Java-like syntax and acts like database stored procedures. Apex enables developers to add business logic to system events, such as button clicks, updates of related records, and Visualforce pages.


source

 Apex is:


  • Hosted—Apex is saved, compiled, and executed on the server—the Force.com platform.
  • Automatically upgradeable—Because compiled code is stored as metadata in the platform, Apex is automatically upgraded as part of Salesforce releases.
  • Object oriented—Apex supports classes, interfaces, and inheritance.
  • Strongly typed—Apex validates references to objects at compile time.
  • Multitenant aware—Governer limit.Because Apex runs in a multitenant platform, it guards closely against runaway code by enforcing limits, which prevent code from monopolizing shared resources.
  • Integrated with the database—It is straightforward to access and manipulate records. Apex provides direct access to records and their fields, and provides statements and query languages to manipulate those records.
  • Data focused—Apex provides transactional access to the database, allowing you to roll back operations.
  • Easy to use—Apex is based on familiar Java idioms.
  • Easy to test—Apex provides built-in support for unit test creation, execution, and code coverage. Salesforce ensures that all custom Apex code works as expected by executing all unit tests prior to any platform upgrades.
  • Versioned—Custom Apex code can be saved against different versions of the API.


Apex is similar in OOP in :
  • Classes, interfaces, properties, and collections (including arrays).
  • Object and array notation.
  • Expressions, variables, and constants.
  • Conditional statements (if-then-else) and control flow statements (for loops and while loops).
Additionally Apex supports:
  • Cloud development as Apex is stored, compiled, and executed in the cloud.
  • Triggers, which are similar to triggers in database systems.
  • Database statements that allow you to make direct database calls and query languages to query and search data.
  • Transactions and rollbacks.
  • The global access modifier, which is more permissive than the public modifier and allows access across namespaces and applications.
  • Versioning of custom code.
  • Apex is a case-insensitive language.

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