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How should equals and hashcode be implemented when using JPA and Hibernate
... Cat {
...
public boolean equals(Object other) {
//Basic test / class cast
return this.catId==other.catId;
}
public int hashCode() {
int result;
return 3*this.catId; //any primenumber
}
}
Fastest way to convert Image to Byte array
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Unable to cast object of type 'System.Byte[]' to type 'System.Drawing.Image'.
– user123
Jun 18 '14 at 12:26
ad...
Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
...
int inBetween2{ 0 };
for (int i = 1; i < MaxNum; ++i)
{
if (static_cast<unsigned>(num - randVec[i - 1]) <= (randVec[i] - randVec[i - 1]))
++inBetween2;
}
Pay attention that randVec is a sorted vector. For any size of MaxNum the first method beats the second one on my machi...
What does the explicit keyword mean?
...
A a4 = A("Venditti");
A* p = new A(1);
A a5 = (A)1;
A a6 = static_cast<A>(1);
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How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?
...ationBean.stringValue}"/>
</task:scheduled-tasks>
... or if the cast from String to Long didn't work, something like this would:
<task:scheduled-tasks scheduler="myScheduler">
<task:scheduled ref="someObject" method="readLog"
fixed-rate="#{T(java.lang.Long).value...
Why would anybody use C over C++? [closed]
...en asked for, it is otherwise the same as C. (virtual, try/throw, dynamic_cast). Much of the overhead only shows in program image size.
– Zan Lynx
Feb 3 '09 at 1:41
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Why is it string.join(list) instead of list.join(string)?
...you have a tuple of strings? If this were a list method, you would have to cast every such iterator of strings as a list before you could join the elements into a single string! For example:
some_strings = ('foo', 'bar', 'baz')
Let's roll our own list join method:
class OurList(list):
def j...
Find size of object instance in bytes in c#
...array for data and an unmanaged proxy class to access values using pointer casting if size matters, note that would be non-aligned memory so on old computers is gonna be slow but HUGE datasets on MODERN RAM is gonna be considerably faster, as minimizing the size to read from RAM is gonna be a bigger...
What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?
...erting.
INSERT INTO my_profile (Address) VALUES ('123 Fake St.');
SELECT CAST(scope_identity() AS int)
ExecuteReader gives you a data reader
back which will allow you to read all
of the columns of the results a row
at a time.
An example would be pulling profile information for one or more users...
Python integer division yields float
...=int ? What should I do, is there a new division operator or must I always cast?
5 Answers
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