【Mysql 调用存储过程，输出参数的坑】

玛德，数据行都返回过来了，就是没有输出参数！！！

扒官方设计文档：这么一段 雷死人了！！！

 

When a stored procedure is called using MySqlCommand.ExecuteReader, and the stored procedure has output parameters, the output parameters are only set after the MySqlDataReader returned by ExecuteReader is closed.