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Spring @Transactional - isolation, propagation
...e to answer.
Propagation
Defines how transactions relate to each other. Common options:
Required: Code will always run in a transaction. Creates a new transaction or reuses one if available.
Requires_new: Code will always run in a new transaction. Suspends the current transaction if one exists....
The new syntax “= default” in C++11
... user-defined default constructor with no initialization list and an empty compound statement.
§12.1/6 [class.ctor] A default constructor that is defaulted and not defined as deleted is implicitly defined when it is odr-used to create an object of its class type or when it is explicitly defaulted ...
What are “named tuples” in Python?
... the standard tuple syntax. They can be used similarly to struct or other common record types, except that they are immutable. They were added in Python 2.6 and Python 3.0, although there is a recipe for implementation in Python 2.4.
For example, it is common to represent a point as a tuple (x, y...
What are the rules for evaluation order in Java?
...be perfectly possible to obey the rules of precedence and associativity by compiling this as:
d = D() // these four computations can happen in any order
b = B()
c = C()
a = A()
sum = a + b // these two computations can happen in any order
product = c * d
result = sum + product // this...
How to decide when to use Node.js?
...is just building an application that does not necessarily need user/server communication, developing with other frameworks would be just fine and will take much less time.
– user482594
Sep 27 '11 at 7:03
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How to create a memory leak in Java?
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community wiki
12 revs, 5 users 51%Daniel Pryden
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Generate a heatmap in MatPlotLib using a scatter data set
...those wanting to do a logarithmic colorbar see this question stackoverflow.com/questions/17201172/… and simply do from matplotlib.colors import LogNorm plt.imshow(heatmap, norm=LogNorm()) plt.colorbar()
– tommy.carstensen
Mar 16 '15 at 20:25
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Finding all possible combinations of numbers to reach a given sum
How would you go about testing all possible combinations of additions from a given set N of numbers so they add up to a given final number?
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What is the difference between YAML and JSON?
...ta processes. For example, it is included by default in the C-based OpenCV computer vision package, whereas JSON is not.
You will find C libraries for both JSON and YAML. YAML's libraries tend to be newer, but I have had no trouble with them in the past. See for example Yaml-cpp.
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Common programming mistakes for Clojure developers to avoid [closed]
What are some common mistakes made by Clojure developers, and how can we avoid them?
8 Answers
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