Advantages of exceptions, PL-SQL Programming

Assignment Help:

Advantages of Exceptions

Using the exceptions for the error handling has many benefits. Without an exception handling, every time you issue a command, you should ensure for the execution errors:

BEGIN

SELECT ...

-- check for 'no data found' error

SELECT ...

-- check for 'no data found' error

SELECT ...

-- check for 'no data found' error

The Error processing is not clearly separated from general processing; nor is it robust. If you ignore to code a check, the error goes unobserved and is possible to cause other, apparently unrelated errors. With the exceptions, you can handle errors correctly without the requirement to code the multiple checks, which is as shown:

BEGIN

SELECT ...

SELECT ...

SELECT ...

...

EXCEPTION

WHEN NO_DATA_FOUND THEN -- catches all 'no data found' errors

The Exceptions improve readability by letting you isolate the error-handling routines. The primary algorithm is not covered by error recovery algorithms. The Exceptions also improve reliability. You do not need to worry about checking for an error at every point it might occur. An exception handler is just adding to your PL/SQL block. If the exception is still raised in that block or any sub-block, you can be definite it will be handled.


Related Discussions:- Advantages of exceptions

Constants and variables in pl sql, Constants and Variables:   You can...

Constants and Variables:   You can declare the constants and variables in the declarative section of any PL/SQL subprogram, block, or package. The Declarations allot the stor

Tautology - equivalences rules, Tautology - Equivalences Rules: If the...

Tautology - Equivalences Rules: If there Tautologies are not all the time as much easy to note as the one above so than we can use these truth tables to be definite that a sta

Error handling in pl/sql, Error Handling The PL/SQL makes it easy to de...

Error Handling The PL/SQL makes it easy to detect and process the predefined and user-defined error conditions known as exceptions. Whenever an error occurs, an exception is ra

Object type in pl/sql, Object Type: The object type is a user-define...

Object Type: The object type is a user-defined composite datatype which encapsulates a data structure along with the functions and procedures required to manipulate the data

Union without corresponding - sql, UNION without CORRESPONDING - SQL T...

UNION without CORRESPONDING - SQL The use of UNION without CORRESPONDING. Example is merely by omitting CORRESPONDING, but only because the operands have identical SELECT clau

Database values-assignments in pl/sql, Database Values You can use the S...

Database Values You can use the SELECT statement to have the Oracle assign values to a variable. For Each and every item in the select list, there must be a matching, type-compa

Example of tables within a table - sql, Example of Tables within a Table - ...

Example of Tables within a Table - SQL Example: Obtaining C_ER from COURSE and EXAM_MARK SELECT CourseId, CAST (TABLE (SELECT DISTINCT StudentId, Mark FROM EXAM_MARK AS EM

Rewrite rules - tautology, Equivalences & Rewrite Rules: If notice tha...

Equivalences & Rewrite Rules: If notice that as well as allowing us to prove trivial theorems, and tautologies enable us to establish that certain sentences are saying the sam

If statement - syntax, IF Statement The IF statement executes a series ...

IF Statement The IF statement executes a series of statement conditionally. Whether the series is executed or not depends on the value of the Boolean expression. Syntax:

Using operator ref - manipulating objects pl sql, Using Operator REF: ...

Using Operator REF: You can retrieve refs by using the operator REF that, like VALUE, takes as its argument a correlation variable. In the illustration below, you retrieve one

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