into an Application
In this module, you use PL/SQL code to enhance functionality in your application.
PL/SQL stands for Procedural Language extension
to SQL. The language offers a robust programming environment that
enables you to program procedurally and/or with object-oriented programming
techniques such as encapsulation, information hiding, and function overloading.
With PL/SQL, you can use state-of-the-art programming for the Oracle Database
server and toolset.
PL/SQL provides procedural constructs such as variables,
constants, and types. The language provides selective and iterative constructs
to SQL. The following are the major benefits of using PL/SQL :
- Integration
of procedural constructs with SQL
Pl/SQL integrates control statements and conditional statements with SQL. This gives you a better control of SQL statemetns and their execution.
- Reduction
in network congestion
PL/SQL allows you to logically combine SQL statements as one unit. The application can send the entire block to the database instead of sending the SQL statements one at a time. This reduces the network traffic.
- Modularized
program development
PL/SQL allows you to group logically related statements within blocks. You can nest blocks inside larger blocks to build powerful programs. Also, you can break your application into smaller modules.
- Integration
with tools
The PL/SQL engine is integrated in Oracle tools such as HTML DB, Oracle Database XE, Oracle Forms, Oracle Reports and so on. When you use these tools, the locally available PL/SQL engine processes the procedural statements and only the SQL statements are passed to the database.
- Portability
PL/SQL programs can run anywhere Oracle server runs irrespective of the operating system and the platform. You do not need to tailor them to each new environment.
- Exception
handling
An exception is an error in PL/SQL that is raised during the execution of a block. PL/SQL allows you to handle exceptions efficiently. You can define separate blocks for dealing with exceptions.
You may find it necessary to use database applications that include programming logic, sequential statements, and SQL statements. Using PL/SQL, you can build applications that are resilient to change over time and that scale to large user populations.
Now that Sheila has to work on the HR application, you watch her add PL/SQL functionalithy to the application. You watch her create procedures, functions, and triggers.
