What is package in PL SQL with an examples?
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.
What is a PL SQL package?
A PL/SQL package is a named collection of functions, procedures, variables, cursors, user-defined types, and records that are referenced using a common qualifier, the package name. Private entities can be referenced and used by functions and procedures within the package, but not by external applications.
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.
How do I create a SQL package?
To create package specs, use the SQL statement CREATE PACKAGE . A CREATE PACKAGE BODY statement defines the package body. For information on the CREATE PACKAGE SQL statement, see Oracle Database SQL Reference. For information on the CREATE PACKAGE BODY SQL statement, see Oracle Database SQL Reference.
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.
Why packages are used in PL SQL?
Why using PL/SQL packages Packages allow you to encapsulate logically related types, variables, constants, subprograms, cursors, and exceptions in named PL/SQL modules. By doing this, you make each package more reusable, manageable, readable and reliable.
Where is PL SQL used?
Function. The purpose of a PL/SQL function is generally used to compute and return a single value. This returned value may be a single scalar value (such as a number, date or character string) or a single collection (such as a nested table or array).
What is trigger in PL SQL with examples?
Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events − A database manipulation (DML) statement (DELETE, INSERT, or UPDATE) A database definition (DDL) statement (CREATE, ALTER, or DROP).
Which software is used for PL SQL programming?
PL/SQL is not a standalone programming language; it is a tool within the Oracle programming environment. SQL* Plus is an interactive tool that allows you to type SQL and PL/SQL statements at the command prompt. These commands are then sent to the database for processing.
What are the examples of database packages?
Some of the most used database software include MySQL, Microsoft SQL Server, Microsoft Access DBMS, Oracle, IBM DB2, and FoxPro. These database management solutions features data independence, as the storage mechanism and formats can be changed without altering the entire application within the database.
What are the disadvantages of PL SQL?
Disadvantages of PL/SQL
- Stored Procedures in PL/SQL uses high memory.
- Lacks functionality debugging in stored procedures.
- Any change in underlying database requires change in the presentation layer also.
- Does not completely separate roles of back-end developer and fron-end developer.
What is SQL,TSQL and PL SQL?
T-SQL (Transact SQL) is an extension of SQL developed by Microsoft. T-SQL is used in Microsoft SQL Server. PL/SQL (Procedural Language/Structured Query Language) is also a procedural extension for SQL developed by Oracle. PL/SQL is a main programming language embedded in the Oracle database.
How do I create a package in Oracle?
Follow these steps to create Package in Oracle SQL developer. On the left side in the connections pane, click on the Schema and expand the node. Then from the list of object types, select the Packages node. Do the right click on it and from the shortcut menu select New Package option. Then a Create Package window will appear.
What is an example of a package?
Packaging may be of several different types. For example, a transport package or distribution package can be the shipping container used to ship, store, and handle the product or inner packages. Some identify a consumer package as one which is directed toward a consumer or household.
What is package in Oracle SQL?
Term: PACKAGE. Definition: In Oracle PL/SQL, a PACKAGE is a group of programmatic constructs combined (“packaged”) into a single unit. The PL/SQL elements that may be included in a package are cursors, variables, exceptions, PL/SQL records and collection types, procedures, and functions.