要实现if-else,语法如下-
if yourCondition then yourStatement1; else yourStatement2; end if ;
要了解存储过程中if-else的上述概念,让我们创建一个存储过程-
mysql> delimiter // mysql> create procedure If_else_stored_demo(value int) begin if value > 1000 then select "your value is greater than 1000"; else select "your value is less than or equal to 1000"; end if ; end // mysql> delimiter ;
现在您可以使用调用命令来调用存储过程-
mysql> call If_else_stored_demo(500);
这将产生以下输出-
+------------------------------------------+ | your value is less than or equal to 1000 | +------------------------------------------+ | your value is less than or equal to 1000 | +------------------------------------------+ 1 row in set (0.00 sec)