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LoaderManager with multiple loaders: how to get the right cursorloader
... It works with Loader.getID()! I've doublechecked this right now. Great!
– Kay Gladen
Oct 31 '11 at 20:20
2
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How to serialize a lambda?
...e any use of such a cast expression outside of casting lambdas? E.g. is it now also possible to do something similar with an ordinary anonymous class?
– Balder
Apr 2 '14 at 10:50
6...
For each row return the column name of the largest value
I have a roster of employees, and I need to know at what department they are in most often. It is trivial to tabulate employee ID against department name, but it is trickier to return the department name, rather than the number of roster counts, from the frequency table. A simple example below (colu...
How to secure RESTful web services?
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There's another, very secure method. It's client certificates. Know how servers present an SSL Cert when you contact them on https? Well servers can request a cert from a client so they know the client is who they say they are. Clients generate certs and give them to you over a secure c...
Difference between scaling horizontally and vertically for databases [closed]
... the need for scaling that is increasing resources so that your system can now handle more requests than it earlier could.
When you realise your system is getting slow and is unable to handle the current number of requests, you need to scale the system.
This provides you with two options. Either...
Does “display:none” prevent an image from loading?
...ser which will not load the image if the display is set to none. Opera has now moved to webkit and will render all images even if their display is set to none.
Here is a testing page that will prove it:
http://www.quirksmode.org/css/displayimg.html
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Simulate delayed and dropped packets on Linux
... the local Ethernet.
# tc qdisc add dev eth0 root netem delay 100ms
Now a simple ping test to host on the local network should show an increase of 100 milliseconds. The delay is limited by the clock resolution of the kernel (Hz). On most 2.4 systems, the system clock runs at 100 Hz which all...
Is there a literal notation for an array of symbols?
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Yes! This is possible now in Ruby 2.0.0. One way to write it is:
%i{foo bar} # => [:foo, :bar]
You can also use other delimiters, so you could also write %i(foo bar) or %i!foo bar! for example.
This feature was originally announced here:
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psycopg2: insert multiple rows with one query
...)
Printing the insert_query outputs
insert into t (a, b) values %s,%s
Now to the usual Psycopg arguments substitution
cursor.execute(insert_query, data)
Or just testing what will be sent to the server
print (cursor.mogrify(insert_query, data).decode('utf8'))
Output:
insert into t (a, b) ...