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How do ACID and database transactions work?
...l ever be violated.
Isolation means that one transaction cannot read data from another transaction that is not yet completed. If two transactions are executing concurrently, each one will see the world as if they were executing sequentially, and if one needs to read data that is written by another,...
How to increment a datetime by one day?
...aylight saving time; it is more complex e.g., see How can I subtract a day from a python date?
– jfs
Jun 25 '15 at 19:51
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Copy all files with a certain extension from all subdirectories
... unix, I want to copy all files with a certain extension (all excel files) from all subdirectories to another directory. I have the following command:
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Sending websocket ping/pong frame from browser
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Ping is meant to be sent only from server to client, and browser should answer as soon as possible with Pong OpCode, automatically. So you have not to worry about that on higher level.
Although that not all browsers support standard as they suppose to, t...
How to uncommit my last commit in Git [duplicate]
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@Jefromi: every answer in this question is totally wrong to emphasize --hard, the --soft, is necessary for it to be "uncommit last commit", a --hard will not only uncommit but also destroy your commit. I nearly destroyed a whol...
Better way to shuffle two numpy arrays in unison
...ent solution would be to store your data in one array instead of two right from the beginning, and create two views into this single array simulating the two arrays you have now. You can use the single array for shuffling and the views for all other purposes.
Example: Let's assume the arrays a and...
What are the differences between Perl, Python, AWK and sed? [closed]
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The sed program is a stream editor and is designed to apply the actions from a script to each line (or, more generally, to specified ranges of lines) of the input file or files. Its language is based on ed, the Unix editor, and although it has conditionals and so on, it is hard to work with for c...
Android: How do I prevent the soft keyboard from pushing my view up?
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borrowing from @Dom you can use getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING); to set this value programmatically
– Bron Davies
Sep 18 '15 at 5:32
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Getting the location from an IP address [duplicate]
...ant to retrieve information like the city, state, and country of a visitor from their IP address, so that I can customize my web page according to their location. Is there a good and reliable way to do this in PHP? I am using JavaScript for client-side scripting, PHP for server-side scripting, and M...
Is there a practical use for weak references? [duplicate]
... cache of a particular size and fine tune the cache size if necessary. Far from optimal if the program will run on lots of different configurations - in that case the tiered approach may be worth the additional complexities.
– Voo
Jan 9 '12 at 18:45
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