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Random record from MongoDB
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Do a count of all records, generate a random number between 0 and the count, and then do:
db.yourCollection.find().limit(-1).skip(yourRandomNumber).next()
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Strange out of memory issue while loading an image to a Bitmap object
...te decode method based on your image data source. These methods attempt to allocate memory for the constructed bitmap and therefore can easily result in an OutOfMemory exception. Each type of decode method has additional signatures that let you specify decoding options via the BitmapFactory.Options ...
What is the difference between .text, .value, and .value2?
...presenting what is displayed on the screen for the cell. Using .Text is usually a bad idea because you could get ####
.Value2 gives you the underlying value of the cell (could be empty, string, error, number (double) or boolean)
.Value gives you the same as .Value2 except if the cell was formatted...
Can someone explain __all__ in Python?
I have been using Python more and more, and I keep seeing the variable __all__ set in different __init__.py files. Can someone explain what this does?
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Exact difference between CharSequence and String in java [duplicate]
...h can be modified
Any method which accepts a CharSequence can operate on all of these equally well. Any method which only accepts a String will require conversion. So using CharSequence as an argument type in all the places where you don't care about the internals is prudent. However you should us...
What's the difference between an argument and a parameter?
... the parameter.
A bit more info on:
http://en.wikipedia.org/wiki/Parameter_(computer_science)#Parameters_and_arguments
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Rails render partial with block
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In Rails 5.0 there was a change so this is general to all partials, not just layouts. You can change the first line of the calling code to: <%= render '/shared/panel', title: 'some title' do %>
– Jay Mitchell
Sep 26 '19 at 20:10
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Spring schemaLocation fails when there is no internet connection
...ks even though intellij doesn't recognize the classpath syntax inside schemalLocation and highlights it as a error.
– Upgradingdave
Feb 27 '13 at 19:33
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postgresql COUNT(DISTINCT …) very slow
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You can use this:
SELECT COUNT(*) FROM (SELECT DISTINCT column_name FROM table_name) AS temp;
This is much faster than:
COUNT(DISTINCT column_name)
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Trying to add adb to PATH variable OSX
.../bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/Libs/android-sdk-mac_x86/tools:/Libs/android-sdk-mac_x86/platform-tools
You're missing the /Users/simon part.
Also note that if you have both .profile and .bash_profile files, only the latter gets executed.
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