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Implementing Comments and Likes in database
...ity tables Photo, Article, Place have their own PK e.g. PhotoID, ArticleID etc but also have another column for the Entity_ID as a FK? Is this unnecessary?
– volume one
Sep 17 '14 at 21:03
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What exactly are “spin-locks”?
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When you use regular locks (mutexes, critical sections etc), operating system puts your thread in the WAIT state and preempts it by scheduling other threads on the same core. This has a performance penalty if the wait time is really short, because your thread now has to wait for ...
Extracting just Month and Year separately from Pandas Datetime column
...column'].dt.to_period('M')
You could also use D for Day, 2M for 2 Months etc. for different sampling intervals, and in case one has time series data with time stamp, we can go for granular sampling intervals such as 45Min for 45 min, 15Min for 15 min sampling etc.
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实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
...面指定的安装路径，PHP-FPM的默认配置文件为/usr/local/php/etc/php-fpm.conf。
php-fpm.conf是一个XML格式的纯文本文件，其内容很容易看明白。这里重点介绍几个重要的配置标签：
标签listen_address是配置fastcgi进程监听的IP地址以及端口...
Inverse dictionary lookup in Python
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@BrianJack: Dictionaries are not ordered, like sets. Look at collections.OrderedDict for an implementation that is ordered.
– Martijn Pieters♦
Jul 24 '12 at 14:40
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Does Git warn me if a shorthand commit ID can refer to 2 different commits?
...ed this one and the one
* that we previously discarded in the reverse order,
* we would end up showing different results in the
* same repository!
*/
ds->candidate_ok = (!ds->disambiguate_fn_used ||
ds->fn(ds->candidate, ds->cb_data));
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Python: split a list based on a condition?
...st comprehension far easier to read, and you don't have to worry about the order being messed up, duplicates being removed as so on.
In fact, I may go another step "backward", and just use a simple for loop:
images, anims = [], []
for f in files:
if f.lower() in IMAGE_TYPES:
images.ap...
add created_at and updated_at fields to mongoose schemas
...ppropriate
fields updated and the rest of the fields copied over.Then in order to
query this document you would get the one with the newest timestamp or
the highest version which is not "deleted" (the deleted field is undefined or false`).
Data immutability ensures that your data is debug...
What's the point of JAXB 2's ObjectFactory classes?
...ple/reference of what (or how complicated) a Schema element needs to be in order for create*() to do something useful? I'm having trouble finding the part of the Schema you're referencing with your JAXB example. If my Schema gets more complicated later, it'd certainly be nice for create* to handle p...
How to remove multiple indexes from a list at the same time? [duplicate]
...ue):
del my_list[index]
Note that you need to delete them in reverse order so that you don't throw off the subsequent indexes.
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