Mysql储存过程2:变量定义与参数传递

#储存过程 中的变量定义
declare 变量名 类型 可选类型 -- 跟建表差不多create procedure p()begindeclare age int default(18);declare number int default 1;select age+number;end$
/*
mysql> create procedure p()->   begin->     declare age int default(18);->     declare number int default 1;->     select age+number;->   end$
Query OK, 0 rows affected (0.00 sec)mysql> call p$
+------------+
| age+number |
+------------+
|         19 |
+------------+
1 row in set (0.00 sec)Query OK, 0 rows affected (0.01 sec)
*/
#储存过程 中， 变量可以运算
#运算结果赋修值给变量用: set age := 运算式
#set age := age + 2

 

#参数传递mysql> create procedure p2(number int, age int)->       begin->         select age+number;->       end$
Query OK, 0 rows affected (0.00 sec)mysql> call p2(1,2)$
+------------+
| age+number |
+------------+
|          3 |
+------------+
1 row in set (0.00 sec)Query OK, 0 rows affected (0.01 sec)mysql>