如何从JAVA / JSP检查图像是否存储在数据库中？ [英] How to check whether the image is stored in database or not from JAVA/JSP?

问题描述

我有保存图片的专栏。我在数据库中使用BLOB类型来存储图像。现在，我想检查用户是否从JSP页面提交了图片。我怎样才能做到这一点？

I have column to save image. I have use "BLOB" type in database to store image. Now, I want to check whether the user submitted picture or not from JSP page. How can I achieve this?

此问题的上一版本是
如何比较JSP中数据库（mysql）的BLOB是否为空？

推荐答案

因此无法检查。您可以将其设为非空列，以确保始终保存图像，或者您可以将控件提供给用户以编辑/删除保存的图像，这也将确保保存图像。

There is as such no way to check. You can either make it a not null column which will ensure the image is always saved or you can give the control to the user to edit/delete the saved image which will also ensure the image is saved.

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