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安卓App可以实现从其他App的目录中拷贝文件吗？ - App应用开发 - 清泛IT社...
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3、如果其他应用通过 ContentProvider 或 FileProvider 显式共享文件，你的App可以通过 ContentResolver 访问这些文件。
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沙箱机制
每个app运行在自己的沙箱中，私有目录对其他app是完全隔离的，即使知道包名和路径...
MySQL error: key specification without a key length
...aracters for a single-byte charset like LATIN1 and only 255 characters for UTF8 (MySQL only uses BMP which requires at most 3 bytes per character)
If you need your whole column to be the PRIMARY KEY, calculate SHA1 or MD5 hash and use it as a PRIMARY KEY.
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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
...mongoimport工具可供使用，不过它只接受json、csv等格式的源文件，不适合我的需求，所以我没用，而是用PHP写了一个脚本，平稳运行了一段时间后，我发现数据导入的速度下降了，同时PHP抛出异常：
cursor timed out (timeout: 30000, time l...
What is the best scripting language to embed in a C# desktop application? [closed]
... expose our object model to a scripting langauge. Time was when that meant VBA (which is still an option), but the managed code derivative VSTA (I think) seems to have withered on the vine.
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20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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3. lsof — 打开文件列表
lsof 命令对于很多 Linux/Unix 系统都可以使用，主要以列表的形式显示打开的文件和进程。
打开的文件主要包括磁盘文件、网络套接字、管道、设备和进程。使用...
Changing the maximum length of a varchar column?
...le` CHANGE `property` `property`
VARCHAR(whatever_you_want) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL;
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A better similarity ranking algorithm for variable length strings
...s discussion has been really helpful, thanks. I converted the algorithm to VBA for use with Excel and wrote a few versions of a worksheet function, one for simple comparison of a pair of strings, the other for comparing one string to a
Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
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new file: DbConnector
首先应当注意到新的 .gitmodules 文件。 该配置文件保存了项目 URL 与已经拉取的本地目录之间的映射：
[submodule "DbConnector"]
path = DbConnector
url = https://github.com/chaconinc/DbConnector
如果有多个子...
INSERT with SELECT
...g in your SELECT, for example:
SELECT CAST('qwerty' AS CHAR CHARACTER SET utf8) COLLATE utf8_bin;
This conversion (CAST() is synonym of CONVERT() ) is very useful if your tables have different character sets on the same table column (which can potentially lead to data loss if not handled properly...
How do I match any character across multiple lines in a regular expression?
...\S] or the JS workarounds (demo): regex rex(R"(([\s\S]*)<FooBar>)");
vba vbscript - Use the same approach as in JavaScript, ([\s\S]*)<Foobar>. (NOTE: The MultiLine property of the
RegExp object is sometimes erroneously thought to be the option to allow . match across line breaks, while,...