What is a package in PL SQL?
In PL/SQL, a package is a schema object that contains definitions for a group of related functionalities. A package includes variables, constants, cursors, exceptions, procedures, functions, and subprograms. It is compiled and stored in the Oracle Database.
What are the two different parts of the PL SQL packages?
Packages consist of two main components: the package specification and the package body. The package specification is the public interface, comprising the elements that can be referenced outside of the package. A package specification is created by executing the CREATE PACKAGE statement.
What is the package in PL SQL explain with example?
A package is a schema object that groups logically related PL/SQL types, variables, constants, subprograms, cursors, and exceptions. A package is compiled and stored in the database, where many applications can share its contents.
Where is PL SQL used?
PL/SQL can execute a number of queries in one block using single command. One can create a PL/SQL unit such as procedures, functions, packages, triggers, and types, which are stored in the database for reuse by applications.
|Mainly used to manipulate data.||Mainly used to create an application.|
How do I run a package in PL SQL?
Running PL/SQL routines and packages
- In either the Data Source Explorer or the Data Project Explorer, right-click the PL/SQL package or routine that you want to run, and click Run. …
- View the results that correspond to the run action in the SQL Results view.
What are the benefits of PL SQL packages?
PL/SQL has these advantages:
- Tight Integration with SQL.
- High Performance.
- High Productivity.
- Support for Object-Oriented Programming.
- Support for Developing Web Applications.
What is difference between procedure and function?
Function is used to calculate something from a given input. Hence it got its name from Mathematics. While procedure is the set of commands, which are executed in a order.
What are the three parameter modes for procedures?
PL/SQL procedure parameters can have one of three possible modes: IN, OUT, or IN OUT. PL/SQL function parameters can only be IN. An IN formal parameter is initialized to the actual parameter with which it was called, unless it was explicitly initialized with a default value.
Which are groups within a package?
A package group is a collection of package elements. Package groups allow commonly associated elements to be defined as a single unit that can be attached to a rate code or to a reservation. An example might be a Bed and Breakfast package which encompasses a room and breakfast service for a set rate.
Which is better procedure or package?
Packages provide the following advantages: Cohesion: all the procedures and functions relating to a specfic sub-system are in one program unit. This is just good design practice but it’s also easier to manage, e.g. in source control. … We only need to grant EXECUTE on a package rather than on several procedures.
What is advantage of package in Oracle?
Advantages of PL/SQL Packages
Packages let you encapsulate logically related types, items, and subprograms in a named PL/SQL module. Each package is easy to understand, and the interfaces between packages are simple, clear, and well defined. This aids application development. Easier Application Design.
Why are packages used?
Packages are used in Java in order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations easier, etc.