NULL and Exception Handling
In PL/SQL, a NULL statement can act as a placeholder for the program , indicating that no particular action is needed to perform. When incorporated into exception handling, this NULL statement within the EXCEPTION block signifies that no specific action is required to address a certain error situation.
BEGIN
-- Some operations or code execution
-- Exception handling block
BEGIN
-- Code that might raise an exception
DECLARE
numerator INT := 10;
denominator INT := 0;
result INT;
BEGIN
result := numerator / denominator; -- This line may raise a division by zero exception
EXCEPTION
WHEN ZERO_DIVIDE THEN
-- NULL statement used as a placeholder for no specific action needed
NULL; -- Placeholder: No action required for this specific condition
END;
END;
END;
Explanation
Within the catch part, the code tries dividing a number where the bottom bit is put to zero, which might cause a ZERO_DIVIDE error.
In case of a ZERO_DIVIDE error, the EXCEPTION WHEN ZERO_DIVIDE THEN part catches it.
Instead of doing anything particular for this issue, the NULL thing is used as a placeholder, showing that nothing needs to be done or planned for this specific error.
Output:
PL/SQL NULL Statement
PL/SQL, the Procedural Language/Structured Query Language, is a database programming language utilized for database management in Oracle. Within this language, the Null statement plays a crucial role in enhancing code readability and functionality. This article aims to delve into the significance of the Null statement in PL/SQL, exploring its various applications and benefits.