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How to get the last N records in mongodb?
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If I understand your question, you need to sort in ascending order.
Assuming you have some id or date field called "x" you would do ...
.sort()
db.foo.find().sort({x:1});
The 1 will sort ascending (oldest to newest) and -1 will so...
Loop through an array of strings in Bash?
... # do something like: echo $databaseName
done
See Bash Loops for, while and until for details.
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How much faster is Redis than mongoDB?
It's widely mentioned that Redis is "Blazing Fast" and mongoDB is fast too. But, I'm having trouble finding actual numbers comparing the results of the two. Given similar configurations, features and operations (and maybe showing how the factor changes with different configurations and operations), ...
Logging Clientside JavaScript Errors on Server [closed]
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You could try setting up your own handler for the onerror event and use XMLHttpRequest to tell the server what went wrong, however since it's not part of any specification, support is somewhat flaky.
Here's an example from Using XMLHttpRequest to log JavaScri...
How do you specify a byte literal in Java?
...define a simple helper method byte b(int i) { return (byte) i; } somewhere and statically import it. Then you can write f(b(10)).
– Yona Appletree
Oct 11 '13 at 18:56
add a co...
WAMP 403 Forbidden message on Windows 7
... me too. Though in my case I had to first "Put offline", then "Put online" and worked without any other changes to my config files! Thank you!!
– Osmar
Apr 18 '16 at 3:59
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Common xlabel/ylabel for matplotlib subplots
...t. You create your subplots, but then add one bit plot, make it invisible, and label its x and y.
– James Owers
May 12 '17 at 9:31
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Performing Inserts and Updates with Dapper
...terested in using Dapper - but from what I can tell it only supports Query and Execute. I do not see that Dapper includes a way of Inserting and Updating objects.
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Ordering by specific field value first
...LD(name, "core", "board", "other")
If you only care that "core" is first and the other values don't matter:
SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core") DESC
If you want to sort by "core" first, and the other fields in normal sort order:
SELECT id, name, priority
FROM my...
What is the purpose of std::make_pair vs the constructor of std::pair?
...hink you can do one = {10, 20} nowadays but I don't have a C++11 compiler handy to check it.
– MSalters
Feb 14 '12 at 8:11
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