How exceptions propagate in pl/sql programming?, PL-SQL Programming

Assignment Help:

How Exceptions Propagate ?

Whenever an exception is raised, and if the PL/SQL cannot find a handler for it in the present subprogram or block, the exception propagates. That is, the exceptions reproduce it in the succeeding enclosing blocks until a handler is found or there are no more blocks to search. In the latter situation, the PL/SQL returns an unhandled exception error to the host atmosphere.

Though, exceptions cannot propagate across the remote procedure calls (RPCs). As a result, the PL/SQL block cannot catch an exception raised by a remote subprogram.

1751_exceptions propogate.png

 

581_exceptions propogate1.png

 

2358_exceptions propogate2.png

An exception can propagate additional than its scope, that is, additional than the block in which it was declared. Consider the illustration which is as shown below:

BEGIN

...

DECLARE ---------- sub-block begins

past_due EXCEPTION;

BEGIN

...

IF ... THEN

RAISE past_due;

END IF;

END; ------------- sub-block ends

EXCEPTION

...

WHEN OTHERS THEN

ROLLBACK;

END;

As the block in which the exception past_due was declared has no handler, the exception propagates to the enclosing block. But, according to the scope rules, the enclosing blocks cannot reference the exceptions declared in a sub-block. Therefore, only an OTHERS handler can catch the exception.


Related Discussions:- How exceptions propagate in pl/sql programming?

Program, heap sort program in pl/sql

heap sort program in pl/sql

Case sensitivity-naming conventions, Case Sensitivity Similar to all the...

Case Sensitivity Similar to all the identifiers, the variables, the names of constants, and parameters are not case sensitive. For illustration, PL/SQL considers the following n

Organic evolution, Organi c Evolution Evolution is a slow continuou...

Organi c Evolution Evolution is a slow continuous, irreversible and natural process of change to give rise to advance and diverse forms of life i.e. formation of new specie

Using raise_application_error - user-defined exceptions, Using raise_applic...

Using raise_application_error The Package DBMS_STANDARD that is supplied with Oracle gives language facilities that help your application to interact with Oracle. For illustra

Assignment of variable - updating a variable, Assignment of Variable - Upda...

Assignment of Variable - Updating a Variable Syntax: SET SN = SID ('S2'); This can obviously be read as "set the variable SN to be equal in value to SID ( 'S2' )".

Example of unwrap operator - sql, Example of UNWRAP Operator - SQL Exa...

Example of UNWRAP Operator - SQL Example here shows how unwrapping can be done in longhand in SQL. Example: Unwrapping in SQL Letting CONTACT_INFO_WRAPPED denote the res

Using first and last - collection method, Using FIRST and LAST FIRST a...

Using FIRST and LAST FIRST and LAST return the first and last (minimum and maximum) index numbers in a collection. When the collection is empty, the FIRST and LAST return NULL

Mysql developer/programmer, Project Description: I want somebody who can...

Project Description: I want somebody who can help me with an idea that I have been working on for a few months now. The person will require extensive knowledge of warcraft 3 PvP

Begin parameter description in pl sql, BEGIN Parameter Description in pl sq...

BEGIN Parameter Description in pl sql: BEGIN: This keyword signals the beginning of the executable section of a PL/SQL block, that contains executable statements. The execut

Conditionals - sql, Conditionals - SQL At first sight SQL does not app...

Conditionals - SQL At first sight SQL does not appear to have a single operator for expressing logical implication. In this respect it would be in common with most programming

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