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Setting default values for columns in JPA
Is it possible to set a default value for columns in JPA, and if, how is it done using annotations?
18 Answers
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Spring AOP vs AspectJ
I am under the impression that Spring AOP is best used for application specific tasks such as security, logging, transactions, etc. as it uses custom Java5 annotations as a framework. However, AspectJ seems to be more friendly design-patterns wise.
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Which are more performant, CTE or temporary tables?
...t concepts but not too different to say "chalk and cheese".
A temp table is good for re-use or to perform multiple processing passes on a set of data.
A CTE can be used either to recurse or to simply improved readability.
And, like a view or inline table valued function can also be treated like a...
What is the difference between memmove and memcpy?
What is the difference between memmove and memcpy ? Which one do you usually use and how?
9 Answers
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What does DIM stand for in Visual Basic and BASIC?
What does DIM stand for in Visual Basic?
10 Answers
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What is the difference between loose coupling and tight coupling in the object oriented paradigm?
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Tight coupling is when a group of classes are highly dependent on one another.
This scenario arises when a class assumes too many responsibilities, or when one concern is spread over many classes rather than having its own class.
Loose c...
Check if null Boolean is true results in exception
....FALSE or null as any other object.
In your particular case, your Boolean is null and the if statement triggers an implicit conversion to boolean that produces the NullPointerException. You may need instead:
if(bool != null && bool) { ... }
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Check if page gets reloaded or refreshed in JavaScript
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⚠️⚠️⚠️ window.performance.navigation.type is deprecated, pls see Илья Зеленько's answer
A better way to know that the page is actually reloaded is to use the navigator object that is supported by most modern browsers.
It uses the Navigation Timing API.
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Is it worth hashing passwords on the client side
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Basically, your friend is right. But simply hashing the password on the client side is only just better than submitting it as plain text to the server. Someone, who can listen for your plain text passwords is certainly also able to listen for hashe...
What are metaclasses in Python?
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A metaclass is the class of a class. A class defines how an instance of the class (i.e. an object) behaves while a metaclass defines how a class behaves. A class is an instance of a metaclass.
While in Python you can use arbitrary calla...