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How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
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One easy trick that can help with most deadlocks is sorting the operations in a specific order.
You get a deadlock when two transactions are trying to lock two locks at opposite orders, ie:
connection 1: locks key(1), locks ...
Convert a list to a dictionary in Python
...ou don't need izip().
i = iter(a)
b = dict(zip(i, i))
If you want it on one line, you'll have to cheat and use a semicolon. ;-)
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What are unit tests, integration tests, smoke tests, and regression tests?
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Unit test: Specify and test one point of the contract of single method of a class. This should have a very narrow and well defined scope. Complex dependencies and interactions to the outside world are stubbed or mocked.
Integration test: Test the correc...
XPath OR operator for different nodes
...//cd" means among all child nodes and descendant of the root node find all ones named 'book' then find also all named 'cd'. If in the descendance of the root node there are only book nodes,your node-set will contain book nodes only. If in the descendance of the root node there are only cd nodes,yo...
C# Entity-Framework: How can I combine a .Find and .Include on a Model Object?
... (SingleOrDefault), ToList will retrieve all entries first and then select one
– Sander Rijken
Sep 8 '11 at 13:51
5
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ansible: lineinfile for several lines?
The same way there is a module lineinfile to add one line in a file, is there a way to add several lines?
8 Answers
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Checking images for similarity with OpenCV
...ne the most common such techniques and their results.
Comparing histograms
One of the simplest & fastest methods. Proposed decades ago as a means to find picture simmilarities. The idea is that a forest will have a lot of green, and a human face a lot of pink, or whatever. So, if you compare two...
Get Specific Columns Using “With()” Function in Laravel Eloquent
I have two tables, User and Post . One User can have many posts and one post belongs to only one user .
13 Answe...
How to avoid type safety warnings with Hibernate HQL results?
...est:
Write a cast-helper
Simply refactor all your @SuppressWarnings into one place:
List<Cat> cats = MyHibernateUtils.listAndCast(q);
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public static <T> List<T> listAndCast(Query q) {
@SuppressWarnings("unchecked")
List list = q.list();
return list;
}
Prevent ...
Is Haxe worth learning? [closed]
...veloper, you know you can't stick with a single technology for too long. Sooner or later you'll have to deal with changes in the environment or targets (you develop for .NET but an important customer requires PHP, or maybe that widget should be in Flash not Javascript), and this is the best case sce...