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How to work around the lack of transactions in MongoDB?
...SMS sending, which means it won't be logged, user balance won't be reduced etc.
The real problem here is the user can take advantage of race condition and send more messages than his balance allows. This also applies to RDBMS, unless you do SMS sending inside transaction with balance field locking ...
Difference between method and function in Scala
...udes one of the FunctionX traits, such as Function0, Function1, Function2, etc. It might be including PartialFunction as well, which actually extends Function1.
Let's see the type signature for one of these traits:
trait Function2[-T1, -T2, +R] extends AnyRef
This trait has one abstract method (...
Split comma-separated strings in a column into separate rows
...n doing an update after release of the next versions of data.table, dplyr, etc.
– Uwe
Apr 15 '17 at 23:49
I think the ...
How can I add “href” attribute to a link dynamically using JavaScript?
...
var a = document.getElementById('yourlinkId'); //or grab it by tagname etc
a.href = "somelink url"
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Why isn't SQL ANSI-92 standard better adopted over ANSI-89?
...t is" Just respond with a test case we can reproduce, version, patch level etc.
– Mark Brady
Dec 2 '08 at 19:28
2
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Is C++14 adding new keywords to C++?
...inal are "identifiers with special meaning" and are listed in Table 3; and etc. are "alternative representations...for certain operators and punctuators" and are listed in Table 5. Neither table changed between C++11 and C++14.)
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In Python, when should I use a function instead of a method?
...bject like a person.
Attributes are the person's name, height, shoe size, etc.
Methods and functions are operations that the person can perform.
If the operation could be done by just any ol' person, without requiring anything unique to this one specific person (and without changing anything on t...
Returning a C string from a function
...herently understood by the language itself. Other languages (Java, Pascal, etc.) use different methodologies to understand "my string".
If you ever use the Windows API (which is in C++), you'll see quite regularly function parameters like: "LPCSTR lpszName". The 'sz' part represents this notion of ...
Is there a way to check if a file is in use?
...e function below, for example
TimeoutFileAction(() => { System.IO.File.etc...; return null; } );
Reusable method that times out after 2 seconds
private T TimeoutFileAction<T>(Func<T> func)
{
var started = DateTime.UtcNow;
while ((DateTime.UtcNow - started).TotalMillisecond...
When do we need to set ProcessStartInfo.UseShellExecute to True?
...ep UseShellExecute true if you want to open documents, urls or batch files etc... rather than having to explicitly give the path to an executable.
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