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How to set auto increment primary key in PostgreSQL?
...hould always be using a primary key on your table because postgresql internally uses hash table structures to increase the speed of inserts, deletes, updates and selects. If a primary key column (which is forced unique and non-null) is available, it can be depended on to provide a unique seed for t...
How do iOS Push Notifications work?
... the documentation for more information and how to use and configure. It's all there.
Push Notifications
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Create PostgreSQL ROLE (user) if it doesn't exist
.... The DO statement uses plpgsql as default procedural language. The syntax allows to omit the explicit declaration:
DO [ LANGUAGE lang_name ] code
...
lang_name
The name of the procedural language the code is written in. If
omitted, the default is plpgsql.
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What modern C++ libraries should be in my toolbox? [closed]
...abase
SOCI
OTL
LMDB++
Design
IoC Frameworks
Hypodermic
PocoCapsule
Wallaroo
Documents
LibreOffice API
PoDoFo
Graphics
Allegro
OGRE
SFML
GUI
FLTK
GTK
Qt
Qwt
wxWidgets
VTK
Hashing
MurmurHash3
Imaging
Boost.GIL
CImg
DevIL
EasyBMP
FreeImage
ITK
OpenCV
Logging
Boost.Log
log4cxx
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List all virtualenv
In virtualenvwrapper, is there a simple way to list all virtualenv on my machine?
8 Answers
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How to store standard error in a variable
... do it. You'd have to build the entire pipeline into the sub-shell, eventually sending its final standard output to a file, so that you can redirect the errors to standard output.
ERROR=$( { ./useless.sh | sed s/Output/Useless/ > outfile; } 2>&1 )
Note that the semi-colon is needed (in...
What is the difference between canonical name, simple name and class name in Java Class?
...upshot looking at this is:
the name is the name that you'd use to dynamically load the class with, for example, a call to Class.forName with the default ClassLoader. Within the scope of a certain ClassLoader, all classes have unique names.
the canonical name is the name that would be used in an im...
How to convert from System.Enum to base integer?
... enum can have different underlying types (int, long, byte...).
More formally: System.Enum has no direct inheritance relationship with Int32 (though both are ValueTypes), so the explicit cast cannot be correct within the type system
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Behaviour of final static method
...ng(not subject to polymorphism) the ts() of A but it will hide it. If you call ts() in B (NOT A.ts() or B.ts() ... just ts()), the one of B will be called and not A. Since this is not subjected to polymorphism, the call ts() in A will never be redirected to the one in B.
The keyword final will disa...
Remove all whitespace in a string
I want to eliminate all the whitespace from a string, on both ends, and in between words.
10 Answers
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