What are the types of exceptions in Oracle?

What are the types of exceptions in Oracle?

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.

How are user defined exceptions defined?

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 are defined as exceptions in PL SQL?

In PL/SQL, a warning or error condition is called an exception. Exceptions can be internally defined (by the run-time system) or user defined. When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram.

What are cursor exceptions in Oracle?

When you open a cursor that is already open. ORA-06511. INVALID_CURSOR. When you perform an invalid operation on a cursor like closing a cursor, fetch data from a cursor that is not opened. ORA-01001.

Which is not a predefined exception?

Non-predefined exceptions are similar to predefined exceptions, except they do not have predefined names. They do have a standard Oracle error number (ORA-#####) and error message. EXCEPTION_INIT function. You can trap a non-predefined Oracle server error by declaring it first.

How can a user defined exception be raised?

User-defined exceptions must be raised explicitly by RAISE statements. To handle raised exceptions, you write separate routines called exception handlers. The use of OTHERS is optional and is allowed only as the last exception handler. You cannot include OTHERS in a list of exceptions following the keyword WHEN .

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 create a user-defined exception?

When creating your own exceptions, end the class name of the user-defined exception with the word “Exception”, and implement the three common constructors, as shown in the following example. The example defines a new exception class named EmployeeListNotFoundException .

How do you handle exceptions in loop?

Whenever an exception occurred in a loop the control gets out of the loop, by handling the exception the statements after the catch block in the method will get executed. But, the loop breaks.

How can a user-defined exception be raised?

What is an user defined exception?

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.

What is Oracle error?

In Oracle, an ORA-06512 error is a general exception error that tells you where something is going wrong. It is one of the least specific errors produced by Oracle, as it tells you only that there is a problem, but not what is going wrong. For example, a typical error message might read:

What is SQL exception handling?

Exception handling or Error handling in SQL Server is a process of handling errors during execution of a Stored Procedure or a Trigger. It has similarities with other programming language exception handling technique like C# or Vb.Net. This procedure involves the use of two different blocks named TRY…

What is error handling in SQL?

Error handling in SQL Server give us control over Transact-SQL code. For example when things go wrong we get a chance to do something about it and possibly make it right again. SQL Server error handling can be as simple as just logging that something happened or it could be us trying to fix an error.