What is user defined exception in PL SQL?

PL/SQL allows you to define your own exceptions according to the need of your program. A user-defined exception must be declared and then raised explicitly, using either a RAISE statement or the procedure DBMS_STANDARD.

What is user-defined exception in Oracle?

To define a user-defined exception, you use the following syntax:

  1. DECLARE exception_name EXCEPTION; …
  2. PRAGMA EXCEPTION_INIT (exception_name, error_code) …
  3. DECLARE exception_name EXCEPTION; PRAGMA EXCEPTION_INIT (exception_name, error_number);

What does user-defined exception mean?

User Defined Exception or custom exception is creating your own exception class and throws that exception using ‘throw’ keyword. This can be done by extending the class Exception. There is no need to override any of the above methods available in the Exception class, in your derived class.

What is user-defined and pre defined exceptions?

An exception is a runtime error or warning condition, which can be predefined or user-defined. Predefined exceptions are raised implicitly (automatically) by the runtime system. User-defined exceptions must be raised explicitly by RAISE statements.

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What are the two types of exceptions in PL SQL?

PL/SQL facilitates programmers to catch such conditions using exception block in the program and an appropriate action is taken against the error condition. There are two type of exceptions: System-defined Exceptions. User-defined Exceptions.

How do you throw a user defined exception in SQL?

How to Define Exception

  1. Declare exception. You must have to declare user define exception name in DECLARE block. …
  2. RAISE exception. RAISE statement to raised defined exception name and control transfer to a EXCEPTION block. …
  3. Implement exception condition.

How can user defined exception be raised?

User-defined exceptions are never raised by the server; they are raised explicitly by a RAISE statement. … You can define exceptions in functions, procedures, packages or anonymous blocks. While you cannot declare the same exception twice in the same block, you can declare the same exception in two different blocks.

Why do we need user-defined exceptions?

There are a few reasons to have user defined exceptions: You want to pass along extra information such as error codes. For example, if you are a database vendor, you can add extra methods to include your internal error codes.

How do you increase user-defined exceptions in PL SQL?

PL/SQL allows you to define your own exceptions according to the need of your program. A user-defined exception must be declared and then raised explicitly, using either a RAISE statement or the procedure DBMS_STANDARD. RAISE_APPLICATION_ERROR.

What is Raise_application_error in PL SQL?

The RAISE_APPLICATION_ERROR procedure raises an exception based on a user-provided error code and message. This procedure is only supported in PL/SQL contexts.

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What are defined as exceptions in PL SQL Mcq?

Explanation: A predefined exception is the one which is executed whenever a program violates any database rule. Example of this type of exception can be the exception NO_DATA_FOUND. 9) PL/SQL provides a feature to handle the Exceptions which occur in a PL/SQL Block known as exception Handling.

What are the two types of exceptions in DBMS?

There are two types of System defined exceptions – Named System exceptions and Un-named System exceptions. Named System exceptions – These are the predefined exceptions created by the SQL to handle the known types of errors in the code. … These exceptions need to be handled in the exception block.

What is the difference between Pragma Exception_init and Raise_application_error?

much cleaner (i hate when others — should be outlawed). Raise_application_error is used to RAISE an error – exception_init is used to deal with errors (i guess you could say they are opposites in a way).

How many types of exceptions are there in PL SQL?

Exception types

There are three types of exceptions: Predefined exceptions are error conditions that are defined by PL/SQL. Non-predefined exceptions include any standard TimesTen errors. User-defined exceptions are exceptions specific to your application.

What are internally defined exceptions?

Internally defined exceptions are errors which arise from the Oracle Database environment. The runtime system raises the internally defined exceptions automatically. ORA-27102 (out of memory) is one example of Internally defined exceptions. Note that Internally defined exceptions do not have names, but an error code.

What is the syntax of exception handling in PL SQL?

The EXCEPTION section contains handlers for the three exceptions: exception1 is not associated with an sqlcode or sqlstate . exception2 is associated with sqlcode -942 (Undefined name).


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Exception name Description
OTHERS For any exception that has not been caught by a prior condition in the exception section.