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Map enum in JPA with fixed values?
...
For versions earlier than JPA 2.1, JPA provides only two ways to deal with enums, by their name or by their ordinal. And the standard JPA doesn't support custom types. So:
If you want to do custom type conversions, you'll have to use a provider extension (with Hibe...
Spinlock versus Semaphore
...uire the lock and proceed with a "critical section" of code. Usually, this means code that modifies some data shared by several threads.
A semaphore has a counter and will allow itself being acquired by one or several threads, depending on what value you post to it, and (in some implementations) dep...
Deserialize JSON with C#
...d> data {get; set;}
}
public class FacebookFriend
{
public string id {get; set;}
public string name {get; set;}
}
Then you should be able to do:
Friends facebookFriends = new JavaScriptSerializer().Deserialize<Friends>(result);
The names of my classes are just an example. You...
mysql update column with value from another table
... UPDATE participants_registrations INNER JOIN participants ON participants.id = participants_registrations.participantId INNER JOIN registrations ON registrations.id = participants_registrations.registrationId LEFT JOIN groups ON (groups.id = registrations.groupId) SET registrations.groupId = g...
List all svn:externals recursively?
... folder, for example on the project folder just below Trunk. (This doesn't mean that all external folders have to be at the same depth by the way.) Then you can right-click on your project folder, then Properties..., then the tab Subversion, then Properties... then double-click svn:externals.
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What can I use instead of the arrow operator, `->`?
...y stuff isn't considered idiomatic anymore, but unfortunately that doesn't mean you can afford to not be familiar with it as a practicing C++ programmer. Also the syntactically nice path is often not the semantically nice path, but that also has been getting better not worse. But then again I have C...
What is “overhead”?
... word "overhead" a lot when it comes to programs and sorts. What does this mean exactly?
12 Answers
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python list in sql query as parameter
....join(placeholder for unused in l)
query= 'SELECT name FROM students WHERE id IN (%s)' % placeholders
cursor.execute(query, l)
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How can I call a custom Django manage.py command directly from a test driver?
...ords mock module and also rewiring stdout for the duration of a test would mean you could get some more out of this technique too - test the output, exit conditions etc.
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Git: Show all of the various changes to a single line in a specified file over the entire git histor
...a visual comparison:
git log -U0 -S "var identifier =" path/to/file
-U0 means output in patch mode (-p), and show zero lines of context around the patch.
You can even do this across branches:
git log -U0 -S "var identifier =" branchname1 branchname2 -- path/to/file
There may be a way to suppr...