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Ways to save enums in database
...ues. For example, changing the Suit enumeration to:
public enum Suit { Unknown, Heart, Club, Diamond, Spade }
would have to become :
public enum Suit {
Unknown = 4,
Heart = 1,
Club = 3,
Diamond = 2,
Spade = 0 }
in order to maintain the legacy numerical values sto...
Swapping column values in MySQL
I have a MySQL table with coordinates, the column names are X and Y. Now I want to swap the column values in this table, so that X becomes Y and Y becomes X. The most apparent solution would be renaming the columns, but I don't want to make structure changes since I don't necessarily have permission...
Using Vim's persistent undo?
...
This now works as expected: file.txt open in a Vim 7.4 buffer on Windows 7, :setlocal undofile, then save a change to the buffer, and the undofile .file.txt.un~ is created alongside because :set undodir? reports that "undodir=." b...
namedtuple and default values for optional keyword arguments
...can also cause problems by breaking isinstance(Node('val'), Node): it will now raise an exception, rather than returning True. While a bit more verbose, @justinfay's answer (below) preserves type hierarchy information properly, so is probably a better approach if others are going to interact with No...
CSS Font Border?
With all the new CSS3 border stuff going on ( -webkit , ...) is it now possible to add a border to your font? (Like the solid white border around the blue Twitter logo). If not, are there any not-too-ugly hacks that will accomplish this in CSS/XHTML or do I still need to fire up Photoshop?
...
Windows: How to specify multiline command on command prompt?
... file
echo Dumping SLN file contents
type "%%~T"
)
)
Now, you could use the line-continuation carat (^) and manually type it out like this, but warning, it's tedious and if you mess up you can learn the joy of typing it all out again.
Well, it won't work with just ^ thanks to ...
AES vs Blowfish for file encryption
...ufficient -- so they doubled that to 32 rounds. The best attack currently known is effective against only 11 rounds. If the original question hadn't specifically restricted the choices to AES and Blowfish, and simply asked for the most secure, reasonably well-known cipher, I'd probably have said Ser...
Correct idiom for managing multiple chained resources in try-with-resources block?
The Java 7 try-with-resources syntax (also known as ARM block ( Automatic Resource Management )) is nice, short and straightforward when using only one AutoCloseable resource. However, I am not sure what is the correct idiom when I need to declare multiple resources that are dependent on each ot...
How to implement WiX installer upgrade?
...add:
<RemoveExistingProducts Before="InstallInitialize" />
From now on whenever I install the product it removed previous installed versions.
Note: replace upgrade Id with your own GUID
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Why is Multiple Inheritance not allowed in Java or C#?
I know that multiple inheritance is not allowed in Java and C#. Many books just say, multiple inheritance is not allowed. But it can be implemented by using interfaces. Nothing is discussed about why it is not allowed. Can anybody tell me precisely why it is not allowed?
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