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Hibernate Error: org.hibernate.NonUniqueObjectException: a different object with the same identifier
...mary key combination (column 1 and column 2). Now, you have removed 5 rows from the table at some point of time. Now, if you try to add the same 10 rows again, while hibernate tries to persist the objects in database, 5 rows which were already removed will be added without errors. Now the remaining ...
C++ valarray vs. vector
...true) didn't help it either.
ISTR that the main reason it wasn't removed from the standard is that nobody took the time to evaluate the issue thoroughly and write a proposal to remove it.
Please keep in mind, however, that all this is vaguely remembered hearsay. Take this with a grain of salt an...
Visual C++: How to disable specific linker warnings?
I'm using a library from CGAL which during the linking stage of my code compilation produces a lot of linking warnings of this form:
...
Call apply-like function on each row of dataframe with multiple arguments from each row
...nction on the row, and the input of the function is using multiple columns from that row. For example, let's say I have this data and this testFunc which accepts two args:
...
How do I pass a unique_ptr argument to a constructor or a function?
...hey must do one of the following:
Base newBase(std::move(nextBase));
Base fromTemp(std::unique_ptr<Base>(new Base(...));
To take a unique pointer by value means that you are transferring ownership of the pointer to the function/object/etc in question. After newBase is constructed, nextBase ...
Simplest way to read json from a URL in java
...t be a dumb question but what is the simplest way to read and parse JSON from URL in Java ?
11 Answers
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python generator “send” function purpose?
...ite coroutines
def coroutine():
for i in range(1, 10):
print("From generator {}".format((yield i)))
c = coroutine()
c.send(None)
try:
while True:
print("From user {}".format(c.send(1)))
except StopIteration: pass
prints
From generator 1
From user 2
From generator 1
From u...
How to exclude a module from a Maven reactor build?
...e -pl !<module_name>,!<module_name> to exclude certain modules from the reactor build.
See this feature request: https://issues.apache.org/jira/browse/MNG-5230
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Java NIO FileChannel versus FileOutputstream performance / usefulness
...ing obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:
The buffer size. The algorithm you basically have is
copy from disk to buffer
copy from buffer to disk
My own experience has been that this buffer size is ripe for tuning. I've...
How do I create and read a value from cookie?
How can I create and read a value from a cookie in JavaScript?
19 Answers
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