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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...
add column to mysql table if it does not exist
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Note that INFORMATION_SCHEMA isn't supported in MySQL prior to 5.0. Nor are stored procedures supported prior to 5.0, so if you need to support MySQL 4.1, this solution isn't good.
One solution used by frameworks that use database migrations is to record in your database...
`Apache` `localhost/~username/` not working
... finish worked for me: https://www.computersnyou.com/3376/setup-apache-php-mysql-macosx-10-10-yosemite/
Basic instructions added in response to suggestion from rozkosz:
These instructions are for setting up apache from scratch after upgrading the Yosemite. It seems like you've done most of this...
How to fix: “UnicodeDecodeError: 'ascii' codec can't decode byte”
...quire a little configuration. Always use Unicode strings for SQL queries.
MySQL
In the connection string add:
charset='utf8',
use_unicode=True
E.g.
>>> db = MySQLdb.connect(host="localhost", user='root', passwd='passwd', db='sandbox', use_unicode=True, charset="utf8")
PostgreSQL
Ad...
How to drop unique in MySQL?
...
Simply you can use the following SQL Script to delete the index in MySQL:
alter table fuinfo drop index email;
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NSIS学习笔记（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
NSIS学习笔记（持续更新）Q 如何使用C++开发插件,示例环境：VS2013Update4参考资料[3]来做S1:新建一个空的C++DLL项目，nsMessageBoxPlugin.S2:复制C: Program File...Q 如何使用C++开发插件,示例
环境：VS2013Update4
参考资料[3]来做
S1:新建一个空...
How to truncate a foreign key constrained table?
...
As per mysql documentation, TRUNCATE cannot be used on tables with foreign key relationships. There is no complete alternative AFAIK.
Dropping the contraint still does not invoke the ON DELETE and ON UPDATE.
The only solution I can...
App Inventor 2 SemiCircleArc 扩展：高级自定义半圆进度条 · App Inventor 2 中文网
...变颜色。参数为起始颜色和结束颜色的数值。
ResetFont重置字体()
将字体重置为默认的 Sans Serif 字体。
属性
BackgroundColor背景颜色
设置半圆进度条的背景颜色。
ProgressBarColor进度条颜色
设置进度条的...
猫狗叫 · App Inventor 2 中文网
...按钮，确认声音播放且票数分别变化。接下来可以添加“重置投票”按钮、限制同一用户重复投票、改成其他主题，或用一个 Player 加变量切换声音来源。
边做边查
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What's the difference between utf8_general_ci and utf8_unicode_ci?
...ncoding. The differences are in how text is sorted and compared.
Note: In MySQL you have to use utf8mb4 rather than utf8. Confusingly, utf8 is a flawed UTF-8 implementation from early MySQL versions which remains only for backward compatibility. The fixed version was given the name utf8mb4.
Note: N...