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App Inventor 2 拓展参考文档 · App Inventor 2 中文网

...理 【FTP】App Inventor 2 FTP 上传下载全方案总结 【MD5、密码安全】Encrypt.Security 安全性扩展:MD5哈希,SHA1和SHA256哈希,AES加密/解密,RSA加密/解密,BASE64编码/解码 【AES加解密】MareshaAES 拓展:AES加解密算法 【CRC校验】App Inven...
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支撑Github的开源技术 - 开源 & Github - 清泛网 - 专注C/C++及内核技术

...取服务状态等,在2013年的QCon北京中,Giuthub的工程曾针对如何使用Hubot做运维进行过分享:《ChatOps at GitHub》。 d3 d3是使用JavaScript实现的数据可视化框架,使用HTML、SVG和CSS等,在d3的基础之上发展处诸如crossfilter、NVD3.js等一...
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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...使用ext3,可能会遇到这类问题,所以还是大概介绍一下如何解决: MongoDB按需自动生成数据文件:先是<DB>.0,大小是64M,然后是<DB>.1,大小翻番到128M,到了<DB>.5,大小翻番到2G,其后的数据文件就保持在2G大小。为了避免可能出...
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How can prepared statements protect from SQL injection attacks?

...ample shows it (all examples in PHP/Mysql): $expected_data = 1; $query = "SELECT * FROM users where id=$expected_data"; will produce a regular query SELECT * FROM users where id=1 while this code $spoiled_data = "1; DROP TABLE users;" $query = "SELECT * FROM users where id=$spoiled_da...
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App Inventor 2 数据库方案全览:从本地存储到云端服务 - App应用开发 - 清...

...式灵活性最高,但需要自己搭建和维护服务端。 四、如何选择? 简单总结一下选型思路: - 只需要存点本地配置 -- 微数据库(TinyDB) - 需要复杂的本地数据管理 -- SQLite - 需要跨设备共享少量数据 -- 网络微数据库(TinyW...
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乐高机器人®组件 · App Inventor 2 中文网

...hoCount 获取计数器() 获取当前计数器值。 ResetTachoCount 重置计数器() 将当前计数器值设置为零。 RotateInDistance 按距离旋转(power,distance,useBrake) 按指定距离旋转马达。 RotateInDuration 按时长旋转(power,milliseconds,useBrake) 在一...
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PHP and MySQL - how to avoid password in source code? [duplicate]

I have a small PHP application storing data in a MySQL database. Currently username / password are hard-coded in the PHP code. A situation I do not really like, for example, since the code is also available in a repository. ...
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phpcms v9与ucenter通信失败 完美解决 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...名:root (必填,视实际情况而定) Ucenter 数据库密码root (视实际情况而定) Ucenter 数据库名:discuz (必填,视实际情况而定) Ucenter 数据库表前缀:`discuz`.pre_ucenter_ (必填,视实际情况而定。如果此...
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What's wrong with nullable columns in composite primary keys?

...ow in a table: when a table has a primary key, you have a guranteed way to select any row from it. A unique constraint does not necessarily identify every row; it just specifies that if a row has values in its columns, then they must be unique. This is not sufficient to uniquely identify every row...
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The opposite of Intersect()

... This code enumerates each sequence only once and uses Select(x =&gt; x) to hide the result to get a clean Linq-style extension method. Since it uses HashSet&lt;T&gt; its runtime is O(n + m) if the hashes are well distributed. Duplicate elements in either list are omitted. publi...