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In Postgresql, force unique on combination of two columns
...ry key over unique here, because we do not allow NULL values in this case. From the PostgeSQL docs: "Note that a unique constraint does not, by itself, provide a unique identifier because it does not exclude null values.)" postgresql.org/docs/8.1/static/ddl-constraints.html#AEN2038
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Scala: what is the best way to append an element to an Array?
... @tenshi would all these operators create a new array? Yes, it does (from :+ code) Array.copy(repr, 0, result, 0, repr.length)
– Timofey
Apr 4 '15 at 9:57
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Performance - Date.now() vs Date.getTime()
... t1 = Date.now();
var t2 = new Date().getTime();
However, the time value from any already-created Date instance is frozen at the time of its construction (or at whatever time/date it's been set to). That is, if you do this:
var now = new Date();
and then wait a while, a subsequent call to now.g...
How to make a new line or tab in XML (eclipse/android)?
...tring.xml
<?xml version="1.0" encoding="utf-8"?>
and use
'\n'
from where you want to break your line.
ex. <string> Hello world. \n its awesome. <string>
Output:
Hello world.
its awesome.
share
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What does ON [PRIMARY] mean?
... This also means it's usually useless and can be safely removed from the script.
– MGOwen
Mar 3 '11 at 0:38
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Is there a TRY CATCH command in Bash
...
# this subshell is a scope of try
# try
(
# this flag will make to exit from current subshell on any error
# inside it (all functions run inside will also break on any error)
set -e
a
b
# do more stuff here
)
# and here we catch errors
# catch
errorCode=$?
if [ $errorCode -ne 0 ]; then
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What does (function($) {})(jQuery); mean?
...efine inside that function remains local to that function and inaccessible from the outside world (unless you specifically expose it - usually via a returned object literal).
A variation of this basic form is what you see in jQuery plugins (or in this module pattern in general). Hence:
(function($...
How to add text to request body in RestSharp
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I tried this and got a null reference exception from within rest#. Found a solution at stackoverflow.com/a/44281853/109736
– JasonCoder
Jul 26 '19 at 21:19
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Should switch statements always contain a default clause?
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Just fixed a bug, that would have caused a warning from the Compiler if there was no default: so generally a Switch over enum Variables should have no default.
– notan
Oct 24 '18 at 13:49
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Example of UUID generation using Boost in C++
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Learn from me and make generators thread local. They're very expensive to seed
– James
Mar 7 at 23:21
add ...