PL/SQL Package | Top Q&A
Video What is Package in oracleSummary: in this tutorial you will learn about PL/SQL packages and the benefits of using packages during your application development.
What is a PL/SQL package?
Contents
In PL/SQL, a package is a schema object that contains definitions for a group of related functions. A package includes variables, constants, pointers, exceptions, procedures, functions, and subroutines. It is compiled and stored in the Oracle Database. Read: what is a package in oracleTypical, a package has a specification and a body. A package specification is required while the package content may be required or optional, depending on the package specification. The following image illustrates the PL/SQL packages:
Package Specification
The package specification declares public objects accessible from outside the package. Read more: Different types of downpipes Explain | Top Q&A If a package specification has public objects including pointers and subroutines, it must have a body that defines queries for pointers and code for subroutines.
Body pack
The package body contains the implementation of pointers or subroutines declared in the package specification. In the package body, you can declare or define private variables, pointers, etc., to be used only by the package body itself. The package body can also have an exception handler that is used to handle exceptions.
Why use the PL/SQL package
Bundling is such a powerful feature of PL/SQL that you should use it in any project. Following are the advantages of the package:
Make the code more modular
Packages allow you to package logically related types, variables, constants, subroutines, pointers and exceptions in named PL/SQL modules. This way you make each package more reusable, manageable, readable and reliable.
Hide implementation details
Read more: What is dissipated net power Packages allow you to expose functionality through their specifications and hide detailed implementation in the package body. That means you can enhance the code in the package body without affecting other dependent packages or applications.
Improve application performance
Oracle loads the package into memory the first time you call a package subroutine. Subsequent calls of other subroutines in the same package do not require disk I/O. This mechanism improves performance.
Minimize unnecessary code recompilation
Packages help avoid unnecessary recompilation. For example, if you change the body of a package function, Oracle will not recompile the subroutines that use the function, because the subroutines depend only on the package specification, not the package body.
By encapsulating objects in a package, you grant roles on that package, rather than granting roles on each object in the package. The PL/SQL package concept is simple yet powerful. They allow you to encapsulate code and make your application easier to develop and maintain. Read more: What color do green and pink make?
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