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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
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:
...
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.
Disjunction (OR, ∨) Again we have nine rows instead of just four and again, when unknown is not involved, the rows are as for 2VL. Also, when anything is paired with true, t
The requirements as follows: Create a folder called "SECURITY" on the server and upload all your project files to that folder. Please note, the "SECURITY" folder is NOT to be IN
Entering and Exiting If you enter the executable part of an autonomous routine, the major transaction suspends. When you exit the routine, the major transaction resumes. To ex
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Example of GROUP BY and COLLECT Operator Example: Using GROUP BY and COLLECT to obtain C_ER2 SELECT CourseId, CAST ( COLLECT (ROW (StudentId, Mark)) AS ROW (Studen
Pass the nulls to a dynamic SQL: Passing Nulls: Assume that you want to pass the nulls to a dynamic SQL statement. For illustration, you may write the EXECUTE IMMEDIATE
Declaring Exceptions The Exceptions can be declared only in the declarative part of the PL/SQL subprogram, block, or package. By introducing its name, you can declare an excep
User-Defined Exceptions The PL/SQL defines the exceptions of your own. Dissimilar to the predefined exceptions, the user-defined exceptions should be declared and should be rai
Declaring Cursor Variables Once a REF CURSOR type is define by you, and then you can declare the cursor variables of that type in any PL/SQL block or subprogram. In the exampl
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