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Spring - @Transactional - What happens in background?
...t uses AOP at its foundation.
But at a very high level, Spring creates proxies for classes that declare @Transactional on the class itself or on members. The proxy is mostly invisible at runtime. It provides a way for Spring to inject behaviors before, after, or around method calls into the object ...
How to write to an existing excel file without overwriting data (using pandas)?
I use pandas to write to excel file in the following fashion:
11 Answers
11
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How do you configure logging in Hibernate 4 to use SLF4J
Hibernate 3.x used slf4j for logging. Hibernate 4.x uses jboss-logging . I am writing a standalone application which uses Hibernate 4, and SLF4J for logging.
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Clang vs GCC - which produces faster binaries? [closed]
...parison is appended to that.
I maintain an OSS tool that is built for Linux with both GCC and Clang,
and with Microsoft's compiler for Windows. The tool, coan, is a preprocessor
and analyser of C/C++ source files and codelines of such: its
computational profile majors on recursive-descent parsing...
How do you check whether a number is divisible by another number (Python)?
...e modulus operator, %
n % k == 0
evaluates true if and only if n is an exact multiple of k. In elementary maths this is known as the remainder from a division.
In your current approach you perform a division and the result will be either
always an integer if you use integer division, or
always...
Error 1022 - Can't write; duplicate key in table
...
Exactly as you said. Many constraints were auto generated with the same idcategory iduser names in the rest of the CREATE query - thanks for your help!
– Git-able
Aug 5 '13 at 14:38
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What's wrong with using == to compare floats in Java?
...ygnus-software.com/papers/comparingfloats/comparingfloats.htm) for why a fixed epsilon isn't always a good idea. Specifically, as the values in the floats being compared get large (or small), the epsilon is no longer appropriate. (Using epsilon is fine if you know your float values are all relativ...
usr/bin/ld: cannot find -l
...
If your library name is say libxyz.so and it is located on path say:
/home/user/myDir
then to link it to your program:
g++ -L/home/user/myDir -lxyz myprog.cpp -o myprog
share
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Customizing Bootstrap CSS template
..., be completely (and easily) modifiable, be sustainable (ie – when the next version of Bootstrap is released from Twitter I don’t have to start over.
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When does invoking a member function on a null instance result in undefined behavior?
...behavior" is mentioned in notes in both §1.9/4 and §8.3.2/4, it's never explicitly stated. (Notes are non-normative.)
However, one can try to deduced it from §3.10/2:
An lvalue refers to an object or function.
When dereferencing, the result is an lvalue. A null pointer does not refer to a...