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Check for NULL or empty variable in a MySQL stored procedure
To check for NULL or empty variable, use the IF condition. Let us create a stored procedure −
mysql> delimiter // mysql> create procedure checkingForNullDemo(Name varchar(20)) begin if Name is NULL OR Name='' then select 'Adam Smith'; else select Name; end if ; end // Query OK, 0 rows affected (0.00 sec) mysql> delimiter ;
Case 1
When NULL is passed. Call the stored procedure using call command
mysql> call checkingForNullDemo(NULL);
This will produce the following output −
+------------+ | Adam Smith | +------------+ | Adam Smith | +------------+ 1 row in set (0.00 sec) Query OK, 0 rows affected, 1 warning (0.00 sec)
Case 2
When a value is passed. Call the stored procedure using the call command
mysql> call checkingForNullDemo('John Doe');This will produce the following output −
+----------+ | Name | +----------+ | John Doe | +----------+ 1 row in set (0.00 sec) Query OK, 0 rows affected (0.00 sec)
Updated on: 25-Feb-2020
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