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Foreign key constraints: When to use ON UPDATE and ON DELETE
...We'll take an example, a company table with a user table containing people from theses company
CREATE TABLE COMPANY (
company_id INT NOT NULL,
company_name VARCHAR(50),
PRIMARY KEY (company_id)
) ENGINE=INNODB;
CREATE TABLE USER (
user_id INT,
user_name VARCHAR(50),
...
GET URL parameter in PHP
...ble that's populated by PHP and is available in all scopes (you can use it from inside a function without the global keyword).
Since the variable might not exist, you could (and should) ensure your code does not trigger notices with:
<?php
if (isset($_GET['link'])) {
echo $_GET['link'];
} e...
How to implement an abstract class in ruby?
...ust to chime in late here, I think that there's no reason to stop somebody from instantiating the abstract class, especially because they can add methods to it on the fly.
Duck-typing languages, like Ruby, use the presence/absence or behavior of methods at runtime to determine whether they should ...
Creating rounded corners using CSS [closed]
...der: 1px solid #ccc;
/* each value for each corner clockwise starting from top left */
-webkit-border-radius: 10px 3px 0 20px;
border-radius: 10px 3px 0 20px;
}
As you see in each set you have browser specific styles and on the fourth rows we declare in standard way by this we...
What to return if Spring MVC controller method doesn't return value?
...the read operation. A 200 status return with no content could be confusing from a REST API perspective.
– raspacorp
Oct 20 '14 at 20:45
...
JavaScript curry: what are the practical applications?
...
From what I've read (just now), "curry" is not normally part of a Function's bag of tricks, unless you are using the Prototype library or add it yourself. Very cool, though.
– Roboprog
...
What is the difference between “Flush Magento Cache” and “Flush Cache Storage” in magento's cache ma
...ding to its associated Magento tag.
Flush Cache Storage:
Remove all items from the cache regardless Magento tag. If you used another location used by other application will be removed in this process.
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How to convert a Django QuerySet to a list
... i've added one more line to my code sample above, deleting the same entry from exising_question_answers. is it possible to use a ifilter for that too somehow?
– john
Dec 12 '10 at 22:43
...
What is the difference between parseInt(string) and Number(string) in JavaScript? [duplicate]
...of radix that Number() doesn't know of and parseInt() may indirectly guess from the given string (that can cause weird results sometimes).
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follo...
How to draw vertical lines on a given plot in matplotlib?
...lines(x_pos, ymin=y1, ymax=y2)
to plot a vertical line at x_pos spanning from y1 to y2 where the values y1 and y2 are in absolute data coordinates.
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