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How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
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Wouldn't it be better to start with CascadeType.PERSIST and use persist to save?
– Sergii Shevchyk
Sep 27 '12 at 19:07
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How to get current memory usage in android?
...fficient. OS needs to know what the accepted answer gives, to know when to start killing apps that haven't been used recently. But an app programmer needs to know what THIS answer (and android developer's similar answer) tells you, vs. runtime.maxMemory.
– ToolmakerSteve
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How to get UTC time in Python?
... of time spent between two dates all that you need is to substract end and start dates. The results of such substraction is a timedelta object.
From the python docs:
class datetime.timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[, weeks]]]]]]])
And this means that by de...
What is a unix command for deleting the first N characters of a line?
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Use cut. Eg. to strip the first 4 characters of each line (i.e. start on the 5th char):
tail -f logfile | grep org.springframework | cut -c 5-
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Ruby on Rails: How do you add add zeros in front of a number if it's under 10?
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If you know you're starting with a string representation of a number, I like this better than sprintf for performance. Using rjust avoids the cost of parsing sprintf's format string, converting a string to a number, and converting that number b...
Targeting .NET Framework 4.5 via Visual Studio 2010
...gling with VS2010/DNFW 4.5 integration and have finally got this working. Starting in VS 2008, a cache of assemblies was introduced that is used by Visual Studio called the "Referenced Assemblies". This file cache for VS 2010 is located at \Reference Assemblies\Microsoft\Framework.NetFramework\v4....
Exclude folders from Eclipse search
... When I tried, this it worked for filtering search results, but I started getting errors "Errors running builder 'AspectJ Builder' on project 'Mercadosa-webapp'. Resource already exists on disk: '/MyProject/target/MyProject-1.0/WEB-INF/freemarker/site/file.ftl'. Resource already exists on d...
How to convert comma-delimited string to list in Python?
...ng.
res.append(sub_str)
# reset sub_str to start over
sub_str = ''
else:
# c is not a deilmeter. then it is
# part of the string.
sub_str += c
# there may not be delimeter at end of data.
# if sub_s...
How to get position of a certain element in strings vector, to use it as an index in ints vector?
...know about pointer arithmetic can be applied to vector iterators as well.
Starting with C++11 you can use std::distance in place of subtraction for both iterators and pointers:
ptrdiff_t pos = distance(Names.begin(), find(Names.begin(), Names.end(), old_name_));
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What's the status of multicore programming in Haskell?
...A collection of reading material on parallelism in Haskell to help you get started
The Snap guys are getting 45k req/sec on their 4 way box, by using all the cores.
Even the Erlang guys are taking notice.
Meanwhile, there is work to make the IO manager more scalable -- now with a paper on the design...