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MongoDB: How to query for records where field is null or not set?
I have an Email document which has a sent_at date field:
6 Answers
6
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Where does this come from: -*- coding: utf-8 -*-
Python recognizes the following as instruction which defines file's encoding:
4 Answers
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Create array of symbols
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The original answer was written back in September '11, but, starting from Ruby 2.0, there is a shorter way to create an array of symbols! This literal:
%i[address city state postal country]
will do exactly what you want.
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What does -XX:MaxPermSize do?
Specifically, why would it help to fix a PermGen OutOfMemoryError issue?
3 Answers
3
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Get TransactionScope to work with async / await
I'm trying to integrate async / await into our service bus.
I implemented a SingleThreadSynchronizationContext based on this example http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx .
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Async/Await vs Threads
In .Net 4.5 Microsoft has added the new Async/Await feature to simplify asynchronous coding. However, I wonder
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How does OpenID authentication work?
I am a little curious to know about how OpenID authentication works.
4 Answers
4
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How add “or” in switch statements?
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By stacking each switch case, you achieve the OR condition.
switch(myvar)
{
case 2:
case 5:
...
break;
case 7:
case 12:
...
break;
...
}
share...
How can I do SELECT UNIQUE with LINQ?
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The Distinct() is going to mess up the ordering, so you'll have to the sorting after that.
var uniqueColors =
(from dbo in database.MainTable
where dbo.Property == true
select dbo.Color.Name).Distinct().Or...
What is a “Bitmap heap scan” in a query plan?
... the principle of "Bitmap heap scan", I know this often happens
when I execute a query with OR in the condition.
1 Answer...