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Solutions for INSERT OR UPDATE on SQL Server
...S..) approach is very dangerous.
When multiple threads will try to perform Insert-or-update you can easily
get primary key violation.
Solutions provided by @Beau Crawford & @Esteban show general idea but error-prone.
To avoid deadlocks and PK violations you can use something like this:
beg...
Purpose of #!/usr/bin/python3
I have noticed this in a couple of scripting languages, but in this example, I am using python. In many tutorials, they would start with #!/usr/bin/python3 on the first line. I don't understand why we have this.
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Angularjs $q.all
I have implemented the $q.all in angularjs, but I can not make the code work. Here is my code :
3 Answers
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Error: “The node to be inserted is from a different document context”
When I am calling XmlNode.AppendChild() , I get this error:
1 Answer
1
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What exception classes are in the standard C++ library
What are the exception classes that are included in the standard C++ library, and what should they be used for? I know there are a few new C++11 exceptions, but I'm not sure what they are or where they are.
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background function in Python
...he images can, at times, be quite large, and they are reused often. Displaying them is not critical, but displaying the message associated with them is. I've got a function that downloads the image needed and saves it locally. Right now it's run inline with the code that displays a message to the us...
top -c command in linux to filter processes listed based on processname
...processes, there are good options to filter the processes by username by using the option -u but I am wondering if there is any easy way to filter the processes based on processname listed under COMMAND column of the top output.
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How to create a temporary directory?
...oesn't already exist. You need to remember to delete the directory after using it though.
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Is there a VB.NET equivalent for C#'s '??' operator?
...soft documentation):
' Variable first is a nullable type.
Dim first? As Integer = 3
Dim second As Integer = 6
' Variable first <> Nothing, so its value, 3, is returned.
Console.WriteLine(If(first, second))
second = Nothing
' Variable first <> Nothing, so the value of first is return...
How to interpret API documentation function parameters?
Is there a standard to interpret the syntax of function interfaces in API documentations and if yes, how is it defined?
4 A...