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Add new field to every document in a MongoDB collection
...to add a new_field to all your collection, you have to use empty selector, and set multi flag to true (last param) to update all the documents
db.your_collection.update(
{},
{ $set: {"new_field": 1} },
false,
true
)
EDIT:
In the above example last 2 fields false, true specifies the upser...
Copy values from one column to another in the same table
...uestion is:
UPDATE `table` SET test=number
Here table is the table name and it's surrounded by grave accent (aka back-ticks `) as this is MySQL convention to escape keywords (and TABLE is a keyword in that case).
BEWARE, that this is pretty dangerous query which will wipe everything in column te...
Calculating sum of repeated elements in AngularJS ng-repeat
...repeat . For each element in the array, it shows the item name, its amount and the subtotal ( product.price * product.quantity ).
...
scp (secure copy) to ec2 instance without password
I have an EC2 instance running (FreeBSD 9 AMI ami-8cce3fe5), and I can ssh into it using my amazon-created key file without password prompt, no problem.
...
Must qualify the allocation with an enclosing instance of type GeoLocation
...
Another option, and the one I prefer, would be to set the inner class to be static.
public static class ThreadTask implements Runnable { ... }
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How to overwrite styling in Twitter Bootstrap
...ow can I change this so that it goes to the right instead? I'm using HAML and SASS but am relatively new to web development.
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How can I select and upload multiple files with HTML and PHP, using HTTP POST?
...hat it looks like in Chrome after selecting 2 items in the file dialog:
And here's what it looks like after clicking the "Upload" button.
This is just a sketch of a fully working answer. See PHP Manual: Handling file uploads for more information on proper, secure handling of file uploads in PH...
How to make RatingBar to show five stars
I am following the standard example of how to add a RatingBar . To control the number of stars I tried to use android:numStars="5" . The problem is that the number of stars doesn't seem to do anything at all. In portrait-layout I get 6 stars and when I flip the phone I get about 10 stars. I tried ...
What's the most appropriate HTTP status code for an “item not found” error page
...t ambiguous for differentiating a bad URI versus entity not found. A new standard code is needed to disambiguate 404s.
– Breakskater
Mar 7 '19 at 16:45
3
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event Action vs event EventHandler
Is there any different between declaring event Action<> and event EventHandler<> .
7 Answers
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