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What is the difference between up-casting and down-casting with respect to class variable
...ing: When we want to cast a Sub class to Super class, we use Upcasting(or widening). It happens automatically, no need to do anything explicitly.
Downcasting : When we want to cast a Super class to Sub class, we use
Downcasting(or narrowing), and Downcasting is not directly possible in Java, expl...
HTML-encoding lost when attribute read from input field
I’m using JavaScript to pull a value out from a hidden field and display it in a textbox. The value in the hidden field is encoded.
...
MySQL get row position in ORDER BY
...
Use this:
SELECT x.id,
x.position,
x.name
FROM (SELECT t.id,
t.name,
@rownum := @rownum + 1 AS position
FROM TABLE t
JOIN (SELECT @rownum := 0) r
ORDER BY t.name) x
WHERE...
jQuery selectors on custom data attributes using HTML5
...s works fine for me, and I make no other reference to data in the js. $('#id').text($('#mydatasource').data('empty')); This will populate the #id element with the contents of the data-empty tag on the #mydatasource element.
– Relaxing In Cyprus
Jun 25 '14 at ...
What is the best collation to use for MySQL with PHP? [closed]
...odings should be the same, such as MySQL, Apache, the HTML and anything inside PHP.
11 Answers
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Understanding :source option of has_one/has_many through of Rails
...s_to :user
end
With this code, you can do something like Newsletter.find(id).users to get a list of the newsletter's subscribers. But if you want to be clearer and be able to type Newsletter.find(id).subscribers instead, you must change the Newsletter class to this:
class Newsletter
has_many :s...
PostgreSQL: Drop PostgreSQL database through command line [closed]
...of activity is currently taking place against your database, including all idle processes.
SELECT * FROM pg_stat_activity WHERE datname='database name';
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How to change field name in Django REST Framework
...already exists. One should be able to mention the foreign instance via its id.
– stelios
Oct 12 '16 at 20:25
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First-time database design: am I overengineering? [closed]
...gn that performance will not be an issue on reasonable hardware.
That said, and this relates to your question 3, with the start you have you probably shouldn't really be overly worried about performance or hyper-sensitivity to normalization orthodoxy here. This is a reporting server you are buil...
Defining custom attrs
I need to implement my own attributes like in com.android.R.attr
5 Answers
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