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Surrogate vs. natural/business keys [closed]
...mall percentage of "natural" keys really fall into that category - SSN and Zip code being the usual examples. I would definitely use a meaningless numeric key for tables like Person, Address - but not for everything, which for some reason most people here seem to advocate.
See also: my answer to a...
App Inventor 2 上传文件和图片到服务器教程 · App Inventor 2 中文网
...ase64文本)。发送 PNG、JPEG 等二进制文件请用 PostFile，不要把图片作为普通文本读取。
Node.js 对应实现
保存为 upload.cjs，在文件所在目录安装依赖并启动：
npm install express@5 multer@2
node upload.cjs
下载 upload.cjs
// ...
How can I capitalize the first letter of each word in a string?
...nce(s):
return ''.join( (c.upper() if prev == ' ' else c) for c, prev in zip(s, chain(' ', s)) )
- Or without importing itertools:
def cap_sentence(s):
return ''.join( (c.upper() if i == 0 or s[i-1] == ' ' else c) for i, c in enumerate(s) )
- Or you can use regular expressions, from steveha...
Undo git reset --hard with uncommitted files in the staging area
...ns rely on there being no git gc, and some of them might cause one, so I'd zip up the contents of your .git directory before trying anything so that you have a snapshot to go back to if one doesn't work for you.
share
...
When should one use RxJava Observable and when simple Callback on Android?
...ed {
UserDetails details;
List<Photo> photos;
}
Observable.zip(api.getUserDetails(userId), api.getUserPhotos(userId), new Func2<UserDetails, List<Photo>, Combined>() {
@Override
public Combined call(UserDetails details, List<Photo> photos) {
...
Can someone give an example of cosine similarity, in a very simple, graphical way?
...1, vector2
def cosim(v1, v2):
dot_product = sum(n1 * n2 for n1, n2 in zip(v1, v2) )
magnitude1 = math.sqrt(sum(n ** 2 for n in v1))
magnitude2 = math.sqrt(sum(n ** 2 for n in v2))
return dot_product / (magnitude1 * magnitude2)
l1 = "Julie loves me more than Linda loves me".split()...
How do you include additional files using VS2010 web deployment packages?
...t;DesktopBuildPackageLocation>..\output\Service\Service\Service.Release.zip</DesktopBuildPackageLocation>
<FilesToIncludeForPublish>OnlyFilesToRunTheApp</FilesToIncludeForPublish>
<ExcludeGeneratedDebugSymbol>true</ExcludeGeneratedDebugSymbol>
<Publish...
Serving gzipped CSS and JavaScript from Amazon CloudFront via S3
...
UPDATE: Amazon now supports gzip compression, so this is no longer needed. Amazon Announcement
Original answer:
The answer is to gzip the CSS and JavaScript files. Yes, you read that right.
gzip -9 production.min.css
This will produce production.mi...
How do you run a Python script as a service in Windows?
...is to use the: NSSM - the Non-Sucking Service Manager. Just download and unzip to a location of your choosing. It's a self-contained utility, around 300KB (much less than installing the entire pywin32 suite just for this purpose) and no "installation" is needed. The zip contains a 64-bit and a 32-bi...
How do I create a namespace package in Python?
... *.pkg files; setuptools doesn't. Likewise, setuptools supports inspecting zip files, and supports adding portions to its _namespace_packages variable, whereas pkgutil doesn't.
– Drake Guan
Sep 26 '12 at 2:24
...