如何显示存储过程中的消息？
要基于条件显示来自存储过程的消息，让我们使用IF-ELSE条件-
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
//
mysql> DELIMITER ;情况1-当值大于100时，使用CALL命令调用存储过程-
call showMessage(200,'John');
这将产生以下输出-
+--------------------------+
| CONCAT("HELLO"," ",Name) |
+--------------------------+
| HELLO John |
+--------------------------+
1 row in set (0.00 sec)情况2-当值小于100时，将显示差异消息，因为将执行ELSE条件-
mysql> call showMessage(10,'John');
这将产生以下输出-
+------------------------+
| CONCAT("BYE"," ",Name) |
+------------------------+
| BYE John |
+------------------------+
1 row in set (0.00 sec)