引入QQ邮箱发送验证码进行安全校验功能实现

目录一.需求分析二.环境准备(1) 邮箱环境(2) 后端环境三.后端程序(1) 效果实现(2) 缓存改进四.前端(补充)最近想给自己的项目在注册时加点安全校验，本想着使用短信验证码，奈何囊中羞涩只能退而求次改用QQ邮箱验证注

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Permissions for Large Variables to Be Sent Via Stored Procedures (SQL Server)

I can\'t figure out a way to allow more tha开发者_如何学编程n 4000 bytes to be received at once via a call to a stored procedure. I am storing images in the table that are around 15 - 20 kilobytes eac