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Is it a good idea to index datetime field in mysql?
...it in conditions frequently in queries. If your only condition is BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 30 DAY) and you have no other index in the condition, MySQL will have to do a full table scan on every query. I'm not sure how many rows are generated in 30 days, but as long as it's less t...
How to do Base64 encoding in node.js?
...String('ascii'));
After this answer was written, it has been updated and now matches this.
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Is there any way to ignore INSTALL_FAILED_VERSION_DOWNGRADE on application install with the Android
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And it seems to be documented now! Just not that you have to use -r -d, -rd will not work
– plaisthos
Jan 8 '16 at 12:44
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Ant: How to execute a command for each file in directory?
... or type foreach". If I understand correctly, this means, foreach is an unknown keyword.
– ivan_ivanovich_ivanoff
Sep 23 '09 at 19:48
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How to copy Java Collections list
...a deep copy, the List, via either mechanism, would have to have intricate knowledge of the underlying type. In the case of Strings, which are immutable in Java (and .NET for that matter), you don't even need a deep copy. In the case of MySpecialObject, you need to know how to make a deep copy of it ...
How to check status of PostgreSQL server Mac OS X
...o get them to take effect, remember to source it like so:
$ . ~/.bashrc
Now, try it and you should get something like this:
$ show-pg-status
pg_ctl: server is running (PID: 11030)
/usr/local/Cellar/postgresql/9.2.4/bin/postgres
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Why is “except: pass” a bad programming practice?
... catch any error
When using a try block, you usually do this because you know that there is a chance of an exception being thrown. As such, you also already have an approximate idea of what can break and what exception can be thrown. In such cases, you catch an exception because you can positively ...
How to commit a change with both “message” and “description” from the command line? [duplicate]
...git and GitHub. I managed to set up everything locally on my Mac, so that now I can push commits to GitHub via git (on the command line, not the Mac app).
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What is stack unwinding?
...e compiler inserting calls to destructors of automatic (stack) variables.
Now this is a very powerful concept leading to the technique called RAII, that is Resource Acquisition Is Initialization, that helps us manage resources like memory, database connections, open file descriptors, etc. in C++.
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What is Inversion of Control?
...SpellChecker(); // dependency
TextEditor textEditor = new TextEditor(sc);
Now the client creating the TextEditor class has control over which SpellChecker implementation to use because we're injecting the dependency into the TextEditor signature.
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