How to display message from a stored procedure?

To display message from stored procedure on the basis of conditions, let us use IF-ELSE condition −

mysql> DELIMITER //
mysql> CREATE PROCEDURE showMessage(value int,Name varchar(20))
   BEGIN
      IF(value > 100) then
         SELECT CONCAT("HELLO"," ",Name);
      ELSE
         SELECT CONCAT("BYE"," ",Name);
      END IF;
      END
      //
Query OK, 0 rows affected (0.18 sec)
mysql> DELIMITER ;

Case 1 − Call the stored procedure using CALL command, when value is more than 100 −

call showMessage(200,'John');

This will produce the following output −

+--------------------------+
| CONCAT("HELLO"," ",Name) |
+--------------------------+
| HELLO John               |
+--------------------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.02 sec)

Case 2 − When the value is less than 100, a difference message will be visible since ELSE condition will execute −

mysql> call showMessage(10,'John');

This will produce the following output −

+------------------------+
| CONCAT("BYE"," ",Name) |
+------------------------+
| BYE John               |
+------------------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.01 sec)