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The order of keys in dictionaries
...as a simplified example; it may or may not have any relation to how he actually plans to use it. I have previously encountered people who expected OrderedDict to return arbitrary insertions in sorted order, and so I felt I should point this out.
– Hugh Bothwell
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In Postgresql, force unique on combination of two columns
...I like the suggestion of a primary key over unique here, because we do not allow NULL values in this case. From the PostgeSQL docs: "Note that a unique constraint does not, by itself, provide a unique identifier because it does not exclude null values.)" postgresql.org/docs/8.1/static/ddl-constraint...
sql “LIKE” equivalent in django query
...s. I have made the lookup into a Django-like-lookup application. After installing it the __like lookup with the % and _ wildcards will be enabled.
All the necessary code in the application is:
from django.db.models import Lookup
from django.db.models.fields import Field
@Field.register_lookup
cl...
SQL WHERE.. IN clause multiple columns
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or more generally SELECT * FROM table INNER JOIN otherTable ON ( table.x = otherTable.a AND table.y = otherTable.b)
– ala
Jul 16 '09 at 7:56
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Easiest way to detect Internet connection on iOS?
... connection to the specific host is routable. That doesn't mean you're actually able to connect. Example: you connect your iPhone's wifi to your camera's wifi. Wifi is connected with a default gateway: all hosts will report reachable. But they are actually not -- the camera is a dead-end connection....
Performance - Date.now() vs Date.getTime()
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These things are the same (edit semantically; performance is a little better with .now()):
var t1 = Date.now();
var t2 = new Date().getTime();
However, the time value from any already-created Date instance is frozen at the time of its construction (or at whateve...
Effective way to find any file's Encoding
... == 0xff) return new UTF32Encoding(true, true); //UTF-32BE
// We actually have no idea what the encoding is if we reach this point, so
// you may wish to return null instead of defaulting to ASCII
return Encoding.ASCII;
}
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Can anybody find the TFS “Unshelve” option in Visual Studio 2012?
..."Find Shelvesets", then right click on the shelve you want to unshelve, finally "Unshelve".
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Symfony 2 EntityManager injection in service
...to inject doctrine EntityManager, but I don't see that __construct() is called on my service, and injection doesn't work.
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Commit changes to a different branch than the currently checked out branch with subversion
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I recommend not to choose the root folder with all the irrelevant sub-folders which are not subject to be modified in the branch. Later it will be easier to merge the (smaller) branch back to trunk.
– J Pollack
Mar 5 '15 at 9:24
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