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Heroku “psql: FATAL: remaining connection slots are reserved for non-replication superuser connectio
... and leaving connections open and then opening new ones when it restarts. If this kind of thing happens a lot then you'll run out of connections. Or the app is just configured improperly and opens too many connections.
– Scott Marlowe
Aug 7 '12 at 15:04
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change cursor to finger pointer
...ke it's necessary to have both onmouseover="" AND style=cursor: pointer;". If you just have the style tag, the pointer pointer cursor will disappear/default to the standard pointer after one click interaction. Good post Scott, thank you.
– Nubtacular
Jun 4 '15 ...
How can foreign key constraints be temporarily disabled using T-SQL?
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If you want to disable all constraints in the database just run this code:
-- disable all constraints
EXEC sp_MSforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all"
To switch them back on, run: (the print is optional of cou...
Python argparse command line flags without arguments
...have it, the argument w is expecting a value after -w on the command line. If you are just looking to flip a switch by setting a variable True or False, have a look at http://docs.python.org/dev/library/argparse.html#action (specifically store_true and store_false)
import argparse
parser = argpars...
Sorting arraylist in alphabetical order (case insensitive)
...s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
Or if you are using Java 8:
list.sort(String::compareToIgnoreCase);
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Compare two Byte Arrays? (Java)
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In your example, you have:
if (new BigInteger("1111000011110001", 2).toByteArray() == array)
When dealing with objects, == in java compares reference values. You're checking to see if the reference to the array returned by toByteArray() is the same a...
What does value & 0xff do in Java?
...on something like this is necessary is that byte is a signed type in Java. If you just wrote:
int result = value;
then result would end up with the value ff ff ff fe instead of 00 00 00 fe. A further subtlety is that the & is defined to operate only on int values1, so what happens is:
value...
Why specify @charset “UTF-8”; in your CSS file?
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It tells the browser to read the css file as UTF-8. This is handy if your CSS contains unicode characters and not only ASCII.
Using it in the meta tag is fine, but only for pages that include that meta tag.
Read about the rules for character set resolution of CSS files at the w3c spec for...
When to use Vanilla JavaScript vs. jQuery?
...k you get the idea.
There will be times when performance is crucial. Like if you're performing something in a loop many times over, you may want to ditch jQuery.
In general you can replace:
$(el).attr('someName');
with:
Above was poorly worded. getAttribute is not a replacement, but it does re...
Django database query: How to get object by id?
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If you want to get an object, using get() is more straightforward:
obj = Class.objects.get(pk=this_object_id)
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