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MySQL foreign key constraints, cascade delete
...#2 (blue):
DELETE FROM categories WHERE (id = 2);
the DBMS will look at all the tables which have a foreign key pointing at the 'categories' table, and delete the records where the matching id is 2. Since we only defined the foreign key relationship in products_categories, you end up with this ta...
Rollback to an old Git commit in a public repo
...hould be good.
You can undo this by
git reset --hard
that will delete all modifications from the working directory and staging area.
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“CAUTION: provisional headers are shown” in Chrome debugger
...ield to find the event related to your resource (use parts of the URL).
Finally, click on the event and see if the info shown tells you something.
For Older Versions of chrome
Type chrome://net-internals in the address bar and hit enter.
Open the page that is showing problems.
Go back to net-int...
Changing the color of an hr element
...
Why even bother with the border at all? Why not just give it a background-color and be done with it? Edit: nvm, I didn't see the answer on browser compatibility.
– Lawyerson
May 26 '16 at 12:39
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What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
When creating a table in SQLite3, I get confused when confronted with all the possible datatypes which imply similar contents, so could anyone tell me the difference between the following data-types?
...
How can I pad a value with leading zeros?
... If performance is a concern for you, don't use this solution!
Potentially outdated: ECMAScript 2017 includes String.prototype.padStart and Number.prototype.toLocaleString is there since ECMAScript 3.1. Example:
var n=-0.1;
n.toLocaleString('en', {minimumIntegerDigits:4,minimumFractionDigits:2...
C# Object Pooling Pattern implementation
...ctPool type, which is used to pool frequently used objects which would normally get new'ed up and garbage collected very often. This reduces the amount and size of garbage collection operations which have to happen. There are a few different sub-implementations all using ObjectPool (See: Why are the...
Microsecond timing in JavaScript
...
As alluded to in Mark Rejhon's answer, there is an API available in modern browsers that exposes sub-millisecond resolution timing data to script: the W3C High Resolution Timer, aka window.performance.now().
now() is better tha...
How do I build a graphical user interface in C++? [closed]
All of my C++ programs so far have been using the command line interface and the only other language I have experience with is PHP which doesn't support GUIs.
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GitHub: How to make a fork of public repository private?
...plicate the repo as others said (details here):
Create a new repo (let's call it private-repo) via the Github UI. Then:
git clone --bare https://github.com/exampleuser/public-repo.git
cd public-repo.git
git push --mirror https://github.com/yourname/private-repo.git
cd ..
rm -rf public-repo.git
...