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      1. mysql 存储过程:输出参数

        mysql stored-procedure: out parameter(mysql 存储过程:输出参数)
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                • 本文介绍了mysql 存储过程:输出参数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我有一个 mysql 存储过程(google book),一个例子是这样的:

                  I have a mysql stored procedure from this (google book), and one example is this:

                  DELIMITER $$
                  
                  DROP PROCEDURE IF EXISTS my_sqrt$$
                  CREATE PROCEDURE my_sqrt(input_number INT, OUT out_number FLOAT)
                  BEGIN
                      SET out_number=SQRT(input_number);
                  END$$
                  
                  DELIMITER ;
                  

                  程序编译良好.(我在 ubuntu 中使用 MySQL 查询浏览器).

                  The procedure compiles fine. (I am using MySQL Query Browser in ubuntu).

                  但是当我调用程序时:

                  CALL my_sqrt(4,@out_value);
                  

                  (也在查询浏览器中)

                  它返回一个错误:

                  (1064) check the manual that correspond to the...
                  

                  为什么这个例子不起作用?

                  Why isn't this example working?

                  推荐答案

                  无法复制.对我来说效果很好:

                  Unable to replicate. It worked fine for me:

                  mysql> CALL my_sqrt(4, @out_value);
                  Query OK, 0 rows affected (0.00 sec)
                  
                  mysql> SELECT @out_value;
                  +------------+
                  | @out_value |
                  +------------+
                  | 2          | 
                  +------------+
                  1 row in set (0.00 sec)
                  

                  也许您应该粘贴整个错误消息而不是总结它.

                  Perhaps you should paste the entire error message instead of summarizing it.

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