In a multi-tier environment (eg. eCommerce development environment), the deployed web applications are separated into three different physical layers: Presentation Layer; Controller Layer; Data Layer. Of this three, the most complex layer is the “Controller Layer” which contains all of our business logic. In an eCommerce application the controller will
At first, a user would request a resource (a web page, an image or a video), and the server would return it; simple, but very limited because the webpages were static. With the growth of commercial activity on the Web, companies had to deliver dynamic content to their customers. So,
PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation’s procedural extension language for SQL and the Oracle relational database. PL/SQL’s general syntax resembles that of Ada or Pascal. PL/SQL is one of three key programming languages embedded in the Oracle Database, along with SQL itself and Java. PL/SQL is available in
When a developer compiles a program, the compiler may find one or more errors in the java code. I am trying to make a java compiler errors list, and this is the first error in the series: There is no default constructor available in org.code.programmers.StickerTracker This error appears when you define in a
You just developed a project and want to share it with your peers, or maybe just want to work on the same project from multiple PCs. And for doing so, you want to up your code at github.com. This post is about how to do this work (starting from the
Structured Query Language, or simple SQL is a programming language designed for managing data in relational database management systems (RDBMS). Its scope includes data insert, query, update and delete, schema creation and modification, and data access control. SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F.
Rules to remember when defining a package statement: There can be EXACTLY ONE package statement in a java source code file. Package and sub-package names should always be in lowercase (according to Java naming conventions). Their names should follow the rules defined for valid java identifiers. The package and sub-package