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Foreign key constraints: When to use ON UPDATE and ON DELETE
... And once you'll get used to database consistency you'll love PostgreSQL.
12/2017-Updating this Edit about MySQL:
as stated by @IstiaqueAhmed in the comments, the situation has changed on this subject. So follow the link and check the real up-to-date situation (which may change again in the future...
What's the difference between setWebViewClient vs. setWebChromeClient?
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153
From the source code:
// Instance of WebViewClient that is the client callback.
private volat...
When would I use Task.Yield()?
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edited Mar 25 '14 at 20:14
answered Mar 25 '14 at 20:05
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How to pass table value parameters to stored procedure from .net code
...iewID
WHEN MATCHED THEN UPDATE SET T.PageViewCount = T.PageViewCount + 1
WHEN NOT MATCHED THEN INSERT VALUES(S.PageViewID, 1);
END
C# Code:
private static void ExecuteProcedure(bool useDataTable,
string connectionString,
...
How to get a subset of a javascript object's properties
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edited Oct 23 '18 at 16:08
ruffin
12.5k77 gold badges6767 silver badges114114 bronze badges
a...
How do I define and use an ENUM in Objective-C?
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109
Your typedef needs to be in the header file (or some other file that's #imported into your hea...
Testing whether a value is odd or even
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return n % 2 == 0;
}
function isOdd(n) {
return Math.abs(n % 2) == 1;
}
You can check that any value in Javascript can be coerced to a number with:
Number.isFinite(parseFloat(n))
This check should preferably be done outside the isEven and isOdd functions, so you don't have to duplicate ...
How to create a cron job using Bash automatically without the interactive editor?
...ontab
crontab -l > mycron
#echo new cron into cron file
echo "00 09 * * 1-5 echo hello" >> mycron
#install new cron file
crontab mycron
rm mycron
Cron line explaination
* * * * * "command to be executed"
- - - - -
| | | | |
| | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
| | | ------...
Docker how to change repository name or rename image?
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1085
docker image tag server:latest myname/server:latest
or
docker image tag d583c3ac45fd mynam...
Bash function to find newest file matching pattern
...ameter -t to sort by time. You can then grab the first (newest) with head -1.
ls -t b2* | head -1
But beware: Why you shouldn't parse the output of ls
My personal opinion: parsing ls is only dangerous when the filenames can contain funny characters like spaces or newlines. If you can guarantee t...