PHP和MySQL实现签名保存:示例应用详细介绍

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资源摘要信息:"saving-signatures-sample-sample是一个用PHP和MySQL实现的简单示例应用程序,该程序能够将Signature Pad(签名板)产生的数据保存到MySQL数据库中。这个示例程序不仅可以帮助开发者理解如何整合签名板与后端存储系统,还演示了在不违反许可协议的前提下,如何合法使用第三方库和技术,如jQuery、json2.js和FlashCanvas。 在这个应用程序中,Signature Pad提供了一个界面,用户可以通过这个界面用鼠标或触摸屏设备进行签名。签名完成后,数据以某种形式(通常为图形数据的编码)被发送到服务器端的PHP脚本。PHP脚本接收到这些数据之后,会将其转换成可以在MySQL数据库中存储的形式。然后,PHP脚本会将数据插入到MySQL数据库中,通常是在一个专门的表里。这个表会有相应的字段来保存签名数据,也可能包括用户的其他相关信息。 对于开发者而言,这个示例程序的重要性在于以下几个方面: 1. 理解Signature Pad工作原理:Signature Pad是一个用于在网页上捕捉用户签名的工具。开发者需要了解如何集成Signature Pad,并处理其生成的签名数据。 2. 学习PHP与MySQL的交互:示例程序展示了如何使用PHP作为服务器端语言与MySQL数据库进行通信。这对于建立动态网页和管理数据存储是基础而关键的知识。 3. 数据库设计:示例中的MySQL数据库设计提供了如何创建表、字段,以及如何存储签名数据的实例。 4. 依赖库的使用:开发过程中经常会用到第三方库和工具。理解如何正确地引用、使用这些库,并遵循它们各自的许可协议,是构建项目的一个重要方面。 5. 跨域请求:考虑到前端的Signature Pad与后端的PHP脚本可能部署在不同的域上,示例程序可能会涉及到跨域请求的处理。 6. 安全性考虑:在存储用户数据时,考虑安全性是非常重要的。开发者需要确保签名数据安全地传输和存储,防止潜在的安全漏洞。 7. 用户界面(UI)与用户体验(UX)设计:为了方便用户签名,需要有一个简单直观且响应式的用户界面。示例程序可能包括了对用户如何与Signature Pad交互的优化。 总结来说,'saving-signatures-sample'不仅仅是一个代码示例,它还是一个学习资源,涵盖了从前端交互到后端处理,再到数据存储和安全性的一系列知识点,为开发者提供了一个完整的实践场景。"

Accum TrustedAccum::TEEaccum(Stats &stats, Nodes nodes, Vote<Void, Cert> votes[MAX_NUM_SIGNATURES]) { View v = votes[0].getCData().getView(); View highest = 0; Hash hash = Hash(); std::set<PID> signers; for(int i = 0; i < MAX_NUM_SIGNATURES && i < this->qsize; i++) { Vote<Void, Cert> vote = votes[i]; CData<Void, Cert> data = vote.getCData(); Sign sign = vote.getSign(); PID signer = sign.getSigner(); Cert cert = data.getCert(); bool vd = verifyCData(stats, nodes, data, sign); bool vc = verifyCert(stats, nodes, cert); if(data.getPhase() == PH1_NEWVIEW && data.getView() == v && signers.find(signer) == signers.end() && vd && vc) { if(DEBUG1) { std::cout << KMAG << "[" << this->id << "]" << "inserting signer" << KNRM << std::endl; } signers.insert(signer); if(cert.getView() >= highest) { highest = cert.getView(); hash = cert.getHash(); } } else { if(DEBUG1) { std::cout << KMAG << "[" << this->id << "]" << "vote:" << vote.prettyPrint() << KNRM << std::endl; } if(DEBUG1) { std::cout << KMAG << "[" << this->id << "]" << "not inserting signer (" << signer << ") because:" << "check-phase=" << std::to_string(data.getPhase() == PH1_NEWVIEW) << "(" << data.getPhase() << "," << PH1_NEWVIEW << ")" << ";check-view=" << std::to_string(data.getView() == v) << ";check-notin=" << std::to_string(signers.find(signer) == signers.end()) << ";verif-data=" << std::to_string(vd) << ";verif-cert=" << std::to_string(vc) << KNRM << std::endl; } } } bool set = true; unsigned int size = signers.size(); std::string text = std::to_string(set) + std::to_string(v) + std::to_string(highest) + hash.toString() + std::to_string(size); Sign sign(this->priv,this->id,text); return Accum(v, highest, hash, size, sign); }

2023-07-17 上传

W: http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://archive.ubuntu.com/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://archive.ubuntu.com/ubuntu jammy InRelease' is not signed. W: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://security.ubuntu.com/ubuntu jammy-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://security.ubuntu.com/ubuntu jammy-security InRelease' is not signed. W: http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://archive.ubuntu.com/ubuntu jammy-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://archive.ubuntu.com/ubuntu jammy-updates InRelease' is not signed. W: http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://archive.ubuntu.com/ubuntu jammy-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://archive.ubuntu.com/ubuntu jammy-backports InRelease' is not signed. E: Problem executing scripts APT::Update::Post-Invoke 'rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true' E: Sub-process returned an error code

2023-06-07 上传