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What happens to an open file handle on Linux if the pointed file gets moved or deleted
...ill work as you assume, since the handle still points to the file.
Specifically, with the delete scenario - the function is called "unlink" for a reason, it destroys a "link" between a filename (a dentry) and a file. When you open a file, then unlink it, the file actually still exists until its ref...
How to export data as CSV format from SQL Server using sqlcmd?
...ith '""' + col1 + '""' AS col1, wrapped in (doubled) double quotes or just call a stored procedure.
– MisterIsaak
Dec 11 '13 at 17:17
...
Are foreign keys really necessary in a database design?
As far as I know, foreign keys (FK) are used to aid the programmer to manipulate data in the correct way. Suppose a programmer is actually doing this in the right manner already, then do we really need the concept of foreign keys?
...
Mod of negative number is melting my brain
... return (x%m + m)%m;
}
Of course, if you're bothered about having two calls to the modulus operation, you could write it as
int mod(int x, int m) {
int r = x%m;
return r<0 ? r+m : r;
}
or variants thereof.
The reason it works is that "x%m" is always in the range [-m+1, m-1]. So i...
What is the use of the @Temporal annotation in Hibernate?
...poral annotation may be used in conjunction with the Basic annotation, the Id annotation, or the ElementCollection annotation (when the element collection value is of such a temporal type.
In plain Java APIs, the temporal precision of time is not defined. When dealing with temporal data, you might...
Batch file to delete files older than N days
...bust, it will in fact work for any directory size, obscure file names, basically arbitrary path lengths and include directories if you need it to - something which surely cannot be said about many other Windows utilities. I would use rd /s /q c:\destination instead of the del command though or even ...
structure vs class in swift language
...Class instances are stored
on Heap hence, sometimes the stack is drastically faster than a
class.
Struct gets a default initializer automatically whereas in Class, we
have to initialize.
Struct is thread safe or singleton at any point of time.
And also,
To summarise the difference betw...
How do I break out of a loop in Scala?
...hird, most of Scala's "loops" aren't actually normal loops--they're method calls that have their own loop, or they are recursion which may or may not actually be a loop--and although they act looplike, it's hard to come up with a consistent way to know what "break" and the like should do. So, to be...
Can I mix Swift with C++? Like the Objective-C .mm files
...om Objective-C to a different language (which has many subtle differences) called Objective-C++. So you're not really using C++; you're using Objective-C++ which accepts most C++ as input (in the same way that C++ accepts most but not all C as input). When I say it's not quite C++, consider a C++ fi...
What are attributes in .NET?
...our objects/methods/properties.
For example I might declare an Attribute called: DisplayOrder so I can easily control in what order properties should appear in the UI. I could then append it to a class and write some GUI components that extract the attributes and order the UI elements appropriatel...