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Most efficient way to check for DBNull and then assign to a variable?
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And once again, commenting on an SO question while away from my own computer (with dev tools on it) has proven to be a mistake! You are right; I'm surprised to learn that TryCast doesn't provide the same convenient functionality as C#'s as operator for Nullable(Of T) types. The cl...
Installing Python 3 on RHEL
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Installing from RPM is generally better, because:
you can install and uninstall (properly) python3.
the installation time is way faster. If you work in a cloud environment with multiple VMs, compiling python3 on each VMs is not accept...
Refreshing OAuth token using Retrofit without modifying all calls
...ient))
.create(RestService.class);
Warning: As Jesse Wilson (from Square) mentions here, this is a dangerous amount of power.
With that being said, I definitely think this is the best way to handle something like this now. If you have any questions please don't hesitate to ask in a c...
Is there a (repeat-last-command) in Emacs?
... Emacs Lisp package, which is included with standard Emacs distributions. From repeat.el's documentation:
This package defines a command that
repeats the preceding command,
whatever that was, including its
arguments, whatever they were. This
command is connected to the key C-x z.
To r...
Why doesn't django's model.save() call full_clean()?
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The most helpful excerpt (IMHO) from the second reference: "Developing an "automatic" validation option which is both simple enough to actually be useful and robust enough to handle all the edge cases is -- if it's even possible -- far more than can be acco...
Reading a List from properties file and load with spring annotation @Value
I want to have a list of values in a .properties file, ie:
16 Answers
16
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SQLAlchemy: What's the difference between flush() and commit()?
...a Session object to query the database, the query will return results both from the database and from the flushed parts of the uncommitted transaction it holds. By default, Session objects autoflush their operations, but this can be disabled.
Hopefully this example will make this clearer:
#---
s =...
Re-raise exception with a different type and message, preserving existing information
... exception hierarchy for the exceptions that it can raise (e.g. inheriting from a FooError abstract class for all the foo module's specific exceptions). This allows users of the module to catch those particular exceptions and handle them distinctly, if needed. But many of the exceptions raised f...
Write applications in C or C++ for Android? [closed]
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For anyone coming to this via Google, note that starting from SDK 1.6 Android now has an official native SDK.
You can download the Android NDK (Native Development Kit) from here:
https://developer.android.com/ndk/downloads/index.html
Also there is an blog post about the NDK:
ht...
Using vagrant to run virtual machines with desktop environment
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I just got this working with basically three steps. The advice from askubuntu.com didn't quite work for me, so try this simplified version:
Get a basic Ubuntu image working. You should be able to boot it and vagrant ssh.
Next, enable the VirtualBox display, which is off by default. Hal...