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The JPA hashCode() / equals() dilemma
There have been some discussions here about JPA entities and which hashCode() / equals() implementation should be used for JPA entity classes. Most (if not all) of them depend on Hibernate, but I'd like to discuss them JPA-implementation-neutrally (I am using EclipseLink, by the way).
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Replacing NULL with 0 in a SQL server query
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When you want to replace a possibly null column with something else, use IsNull.
SELECT ISNULL(myColumn, 0 ) FROM myTable
This will put a 0 in myColumn if it is null in the first place.
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How to enumerate an object's properties in Python?
I C# we do it through reflection. In Javascript it is simple as:
7 Answers
7
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NULL vs nullptr (Why was it replaced?) [duplicate]
...-based applications. I'm just curious of the exact reason why they made this replacement?
4 Answers
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Rails :include vs. :joins
This is more of a "why do things work this way" question rather than a "I don't know how to do this" question...
8 Answers
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PHP: How to remove all non printable characters in a string?
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7 bit ASCII?
If your Tardis just landed in 1963, and you just want the 7 bit printable ASCII chars, you can rip out everything from 0-31 and 127-255 with this:
$string = preg_replace('/[\x00-\x1F\x7F-\xFF]/', '', $string);
It matches anything in r...
How can I transition height: 0; to height: auto; using CSS?
...hing bigger than your box will ever get.
See JSFiddle demo provided by Chris Jordan in another answer here.
#menu #list {
max-height: 0;
transition: max-height 0.15s ease-out;
overflow: hidden;
background: #d5d5d5;
}
#menu:hover #list {
max-height: 500px;
tran...
How do you disable viewport zooming on Mobile Safari?
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Your code is displaying attribute double quotes as fancy double quotes. If the fancy quotes are present in your actual source code I would guess that is the problem.
This works for me on Mobile Safari in iOS 4.2.
<meta name="viewp...
What happens when a duplicate key is put into a HashMap?
...And what if even the value repeats? I didn’t find any documentation on this.
12 Answers
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Why doesn't JavaScript support multithreading?
Is it a deliberate design decision or a problem with our current day browsers which will be rectified in the coming versions?
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