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How to create the perfect OOP application [closed]
...on. Once you have all the relationships between all the nouns worked out, then you can start designing a class hierarchy. There is an abstract base class Item. Book inherits from it. There is an abstract class SalesTax; BasicSalesTax inherits from it. And so on.
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MySQL ON vs USING?
...mn value is equal to the value of its mirroring column in the other table, then you can employ the USING clause.
Otherwise, if the Foreign Key column name differs from the referencing column or you want to include a more complex join condition, then you should use the ON clause instead.
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When to add what indexes in a table in Rails
... what happens? How is this different from adding the index for each key?
Then the index is a combined index of the two columns. That doesn't make any sense, unless you want all entries for one category_id AND one state_id (It should be category_id not category) at the same time.
An Index like th...
Is GridFS fast and reliable enough for production?
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As mentioned, it might not be as fast as an ordinary filesystem but then it gives you man advantages over ordinary filesystems which I think are worth giving up a bit speed for.
Ultimately, with sharding, you might reach a point however where the GridFS storage actually becomes the faster op...
How does git compute file hashes?
...4ab5c1bce84a7b441cb1959cfc7093b7f -
where sha1sum is in GNU Coreutils.
Then it comes down to understanding the format of each object type. We have already covered the trivial blob, here are the others:
commit: What is the file format of a git commit object?
tree: What is the internal format of...
What is Rack middleware?
...or example with Rack I can have separate stages of the pipeline doing:
Authentication: when the request arrives, are the users logon details correct? How do I validate this OAuth, HTTP Basic Authentication, name/password?
Authorisation: "is the user authorised to perform this particular task?", i....
Difference between JVM and HotSpot?
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@TheNewIdiot, so you are saying HotSpot is part of OpenJDK? Or is there also a proprietary HotSpot as the answer above suggests?
– Pacerier
Jul 20 '14 at 12:03
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What is __main__.py?
...so create a directory or zipfile full of code, and include a __main__.py. Then you can simply name the directory or zipfile on the command line, and it executes the __main__.py automatically:
$ python my_program_dir
$ python my_program.zip
# Or, if the program is accessible as a module
$ python -m...
How can I display just a portion of an image in HTML/CSS?
...you want to display as a background in a container (td, div, span etc) and then adjust background-position to get the sprite you want.
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What does the star operator mean, in a function call?
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Sure, but then you would have to call it: s = sum((1, 2, 3, 4, 5)) or s = sum([1, 2, 3, 4, 5]), the *values option makes the call look like it takes a number of arguments, but they're packed up into a collection for the function code.
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