MySQL--帶有out的存儲過程

帶有out 的存儲過程，同樣可以返回一個值，也可以返回多個值

下面分別進行介紹

案例一：根據女神名，返回對應的男神名

delimiter $
create PROCEDURE myp7(in beautyName VARCHAR(20),out boyName VARCHAR(20))
begin 
        select bo.boyName into boyName
        from boys bo
        INNER JOIN beauty b on bo.id=b.boyfriend_id
        where b.name=beautyName;
end $
#調用
#set @bName$  #其實這個定義用戶變量過程是不用寫的，直接按照下面調用的寫法就行
call myp7('小昭',@bName)$
select @bName$

這里我要強調一點就是，在使用dos窗口執行存儲過程的時候，我的電腦也不知道是怎么搞的，始終不能粘貼內容，有時候及時粘貼進去內容之后，回車執行的時候，總是出現mysql->   就好像還讓你輸入下一行了。這里，我推薦大家使用navicat,在navicat中打開命令執行窗口，同樣能夠看到我們想要的效果，同時我們也不用再手動的設置字符集的編碼格式了，方便多了。

下面是運行結果：

 案例二：根據女神名，返回對應的男神名和魅力值

delimiter $
create PROCEDURE     myp8(in beautyName VARCHAR(20),out boyName VARCHAR(20),out userCP INT)
begin
        select bo.boyName,bo.userCP into boyName,userCP
        from boys bo
        INNER JOIN beauty b on bo.id=b.boyfriend_id
        where b.name=beautyName;
end $

#調用
call myp7('小昭',@bName)$
select @bName，@userCP$

運行結果：

mysql> delimiter $
create PROCEDURE     myp8(in beautyName VARCHAR(20),out boyName VARCHAR(20),out userCP INT)
begin
        select bo.boyName,bo.userCP into boyName,userCP
        from boys bo
        INNER JOIN beauty b on bo.id=b.boyfriend_id
        where b.name=beautyName;
end $
Query OK, 0 rows affected (0.00 sec)
mysql> call myp7('小昭',@bName)$
Query OK, 1 row affected (0.00 sec)

mysql> select @bName$,@userCP$
+--------+
| @bName |
+--------+
| 張無忌 |
+--------+
1 row in set (0.06 sec)

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 '@userCP' at line 1
mysql> call myp7('小昭',@bName,@userCP)$
1318 - Incorrect number of arguments for PROCEDURE girls.myp7; expected 2, got 3
mysql> call myp8('小昭',@bName,@userCP)$
Query OK, 1 row affected (0.00 sec)
mysql> select @bName$,@userCP$
+--------+
| @bName |
+--------+
| 張無忌 |
+--------+
1 row in set (0.05 sec)

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 '@userCP' at line 1
mysql> SELECT @userCP$
+---------+
| @userCP |
+---------+
|     100 |
+---------+
1 row in set (0.06 sec)

mysql> SELECT @bName,@userCP$
+--------+---------+
| @bName | @userCP |
+--------+---------+
| 張無忌 |     100 |
+--------+---------+
1 row in set (0.06 sec)

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