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