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  • MySQL--带有inout的存储过程

    #带有inout模式参数的存储过程

     1 案例一:传入a和b两个值,最终a和b的值翻倍并返回
     2 delimiter $
     3 create PROCEDURE myp9(inout a int,inout b int)
     4 begin
     5      set a=a*2;
     6          set b=b*2;
     7 end $
     8 
     9 调用过程
    10 先设置两个用户变量
    11 set @m=10$
    12 set @n=20$
    13 然后调用
    14 call myp9(@m,@n)$
    15 select @m,@n$--最后查看结果

    运行结果:

     1 mysql> delimiter $
     2 create PROCEDURE myp9(intout a int,inout b int)
     3 begin
     4      set a=a*2;
     5          set b=b*2;
     6 end $
     7 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'a int,inout b int)
     8 begin
     9      set a=a*2;
    10          set b=b*2;
    11 end' at line 1
    12 mysql> delimiter $
    13 create PROCEDURE myp9(inout a int,inout b int)
    14 begin
    15      set a=a*2;
    16          set b=b*2;
    17 end $
    18 Query OK, 0 rows affected (0.00 sec)
    19 
    20 mysql> set @a=10$
    21 Query OK, 0 rows affected (0.00 sec)
    22 
    23 mysql> set @b=20$
    24 Query OK, 0 rows affected (0.00 sec)
    25 
    26 mysql> call myp9(@a,@b)$
    27 Query OK, 0 rows affected (0.00 sec)
    28 
    29 mysql> select @a,@b$
    30 +----+----+
    31 | @a | @b |
    32 +----+----+
    33 | 20 | 40 |
    34 +----+----+
    35 1 row in set (0.06 sec)
    36 
    37 mysql> 
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  • 原文地址:https://www.cnblogs.com/dongyaotou/p/12363471.html
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