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Can not connect to local PostgreSQL
...ns, or of you have a distribution installed someplace and have another (eg from source) installation elsewhere), with client and server using different rendez-vous addresses.
If postgres is running, and the socket actually exists, you could use:
psql -h /the/directory/where/the/socket/was/found ...
What languages are Windows, Mac OS X and Linux written in?
...o knows what programming languages Windows, Mac OS X and Linux are made up from and what languages are used for each part of the OS (ie: Kernel, plug-in architecture, GUI components, etc).
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C++ SFINAE examples?
...
Heres one example (from here):
template<typename T>
class IsClassT {
private:
typedef char One;
typedef struct { char a[2]; } Two;
template<typename C> static One test(int C::*);
// Will be chosen if T is anything...
Nested using statements in C#
... that does work, yes, but then when you're calling the IDisposable objects from inside the using block, we can't call any of the class members (without a cast, which defeats the point imo).
– Connell
Mar 22 '13 at 9:58
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Difference between Django's annotate and aggregate methods?
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I would focus on the example queries rather than your quote from the documentation. Aggregate calculates values for the entire queryset. Annotate calculates summary values for each item in the queryset.
Aggregation
>>> Book.objects.aggregate(average_price=Avg('price'))
{'av...
Android Studio needs JDK 7 for Android-L mac
... detail solution step-by-step
For Mac
Download the DMG file of JDK-7 from here
Click on DMG and follow the instructions . It will install and configure JDK-7 on mac .
Now in your android studio go to File->Project Structure -> SDK Location .
In JDK location click on browse and go to /-&...
Android: how to make an activity return results to the activity which calls it?
I have a Location activity that can be called from many activities, such as Sign up and Order . In the Location activity the user enters his location, so the activity Location will return this new location to that activity which called it.
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How to check for file lock? [duplicate]
... answer but simpler and improved with the properly formatted documentation from msdn. I also drew inspiration from Raymond Chen's article and took care of the race condition. BTW I noticed that this method takes about 30ms to run (with the RmGetList method alone taking 20ms), while the DixonD's met...
Paperclip::Errors::MissingRequiredValidatorError with Rails 4
...o_not_validate_attachment_file_type . As Rdocs puts it: Thanks to a report from Egor Homakov we have taken steps to prevent people from spoofing Content-Types and getting data you weren't expecting onto your server.
– user1322092
Aug 13 '14 at 1:07
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How to set RelativeLayout layout params in code not in xml?
...flate(R.layout.footer, null);
View footer = LayoutInflater.from(this).inflate(R.layout.footer,
null);
final RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.FILL_PAR...