Ejabberd data access layer pdf#
Ejabberd data access layer update#

Tables define the physical storage of data in a database, but stored procedures and views allow you to manipulate data as it goes into and out of those tables. You also see sub-layers in the data tier with database systems.

Ejabberd data access layer update#

Designers don’t have to worry about messing up code to make user interface changes, and developers don’t have to worry about sifting through the user-interface to update code. It’s a clean separation because both the markup and the code-behind layers house specific sets of functionality that benefit from being apart. The markup file defines the look and layout of the web form and the code behind file contains the presentation logic. In the presentation layer, the code-behind mechanism for ASP.NET pages and user controls is a prominent example of a layered design. Figure 1 outlines a basic three tired architecture in ASP.NET along with some of the sub-tiers that you may encounter:įigure 1 – Three tiered ASP.NET application with sub-tiers The presentation tier Inside each of these tiers there may also exist a series of sub-layers that provide an even more granular break up the functional areas of the application.

The presentation layer houses the user interface and related presentation code.

The business layer maintains business rules and logic.

The data layer manages the physical storage and retrieval of data.

In the classic three tier design, applications break down into three major areas of functionality: Layered application designs are extremely popular because they increase application performance, scalability, flexibility, code reuse, and have a myriad of other benefits that I could rattle off if I had all of the architectural buzzwords memorized. This is the first in a series of articles discussing some of the cool things you can do with a DAL, so the code and concepts in this article form the base for future discussions.

Ejabberd data access layer pdf#

The article discusses the concepts behind the DAL, and the associated PDF file takes a look at a full-blown DAL implementation. In this article you will explore a key component of application architecture known as the Data Access Layer (DAL), which helps separate data-access logic from your business objects. So it’s always a good idea to make sure you have a good grasp on the fundamentals. Technical interviews normally contain a battery of questions to gauge your architectural knowledge during the hiring process, and your architectural ability only becomes more important as you ascend through the ranks. Designing and building a robust data access layerīuilding an understanding of architectural concepts is an essential aspect of managing your career.