Package specification, PL-SQL Programming

Assignment Help:

The Package Specification

The package specifications contain the public declarations. The scopes of these declarations are local to your database representation and global to the package. Therefore, the declared items are available from your application and from anyplace in the package. The figure describes the scoping.

1386_package specification.png

Figure: Package Scope

The specification lists the package resources accessible to the applications. All the information that your application require to use the resources is in the specification. For illustration, the declaration below shows that the function named the fac takes one argument of the type INTEGER and returns a value of type INTEGER:

FUNCTION fac (n INTEGER) RETURN INTEGER; -- returns n!

That is all the information you require to call the function. You do not require to consider its underlying implementation (whether it is recursive or iterative for illustration). The subprograms and cursors only have an underlying implementation or definition. Therefore, if a specification declares only the constants, types, variables, exceptions, and call specifications, the package body is unessential. Consider the bodiless package which is as shown below:

-- a bodiless package

CREATE PACKAGE trans_data AS

TYPE TimeRec IS RECORD (

minutes SMALLINT,

hours SMALLINT);

TYPE TransRec IS RECORD (

category VARCHAR2,

account INTEGER,

amount REAL,

time_of TimeRec);

minimum_balance CONSTANT REAL := 10.00;

number_processed INTEGER;

insufficient_funds EXCEPTION;

END trans_data;

The package trans_data requires no body as the constants, types, variables, and the exceptions do not have an underlying implementation. These packages define the global variables-usable by the subprograms and database triggers-that persist throughout a session.


Related Discussions:- Package specification

CURSOR, #quesWrite a cursor to open an employee database and fetch the empl...

#quesWrite a cursor to open an employee database and fetch the employee record whose age is greater than 45.tion..

%isopen - explicit cursor attributes, %ISOPEN The %ISOPEN yields TRUE ...

%ISOPEN The %ISOPEN yields TRUE if its cursor or cursor variable is open; or else, the %ISOPEN yields FALSE. In the illustration, you use the %ISOPEN to select an action:

Implement a new discount for return shoppers, Brewbean's is implementing a ...

Brewbean's is implementing a new discount for return shoppers - every fifth completed order receives a 10% discount. The count of orders for a shopper is placed in a packaged varia

Using savepoint, Using SAVEPOINT The SAVEPOINT names and marks the pre...

Using SAVEPOINT The SAVEPOINT names and marks the present point in the processing of a transaction. Used with the ROLLBACK TO statement, the savepoints undo parts of a transac

Initializing and referencing collections, Initializing and Referencing Coll...

Initializing and Referencing Collections Until you initialize a collection, a nested table or varray is automatically null (i.e. the collection itself is null, not its elements)

Update command- sql, UPDATE Command- SQL Loosely speaking, UPDATE chan...

UPDATE Command- SQL Loosely speaking, UPDATE changes some of the column values of some existing rows of its target table. Thus, although some rows disappear from the target an

Testing triggers, Demonstrate your knowledge of PL/SQL programming by writi...

Demonstrate your knowledge of PL/SQL programming by writing and thoroughly testing triggers and stored procedures associated with an e-commerce application that provides security l

Cursor attributes in pl sql, Cursor Attributes   The Cursors and curso...

Cursor Attributes   The Cursors and cursor variables have 4 attributes which give you helpful information about the execution of a data manipulation statement. Syntax:

Definition of cross join - sql, Definition of CROSS JOIN - SQL Let s ...

Definition of CROSS JOIN - SQL Let s = t1 CROSS JOIN t2, where t1 and t2 are table expressions optionally accompanied by range variables. Then: Note: Here T denotes Table

I need sql data base, I need SQL Data Base Project Description: Netwo...

I need SQL Data Base Project Description: Network SQL database and SQL Setup two 4 workstation Skills required are Data Entry, MySQL, SQL

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd