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What is a database transaction?
... you want to treat as "a whole." It has to either happen in full or not at all.
A classical example is transferring money from one bank account to another. To do that you have first to withdraw the amount from the source account, and then deposit it to the destination account. The operation has to ...
Extract numbers from a string
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$str = 'In My Cart : 11 12 items';
preg_match_all('!\d+!', $str, $matches);
print_r($matches);
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What is Gradle in Android Studio?
... have to learn what each tool (dx, aapt) does in the SDK.
Eclipse saved us all from these low level but important, fundamental details by giving us their own build system.
Now, have you ever wondered why the res folder is in the same directory as your src folder?
This is where the build system en...
vs
...urns the character encoding you specified, not the encoding that IE is actually using."
– hotshot309
Jun 5 '12 at 13:51
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How can I change an element's text without changing its child elements?
I'd like to update element's text dynamically:
14 Answers
14
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Create code first, many to many, with additional fields in association table
...join table. In a many-to-many relationship EF manages the join table internally and hidden. It's a table without an Entity class in your model. To work with such a join table with additional properties you will have to create actually two one-to-many relationships. It could look like this:
public c...
How to convert a data frame column to numeric type?
... and this is not the most confounding thing, but it can confuse you, especially if you read this before rolling into bed.
Here goes: first two columns are character. I've deliberately called 2nd one fake_char. Spot the similarity of this character variable with one that Dirk created in his reply. I...
Why is Linux called a monolithic kernel?
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A monolithic kernel is a kernel where all services (file system, VFS, device drivers, etc) as well as core functionality (scheduling, memory allocation, etc.) are a tight knit group sharing the same space. This directly opposes a microkernel.
A microkernel prefe...
Is there a CSS not equals selector?
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In CSS3, you can use the :not() filter, but not all browsers fully support CSS3 yet, so be sure you know what you're doing which is now
supported by all major browsers (and has been for quite some time; this is an old answer...).
Example:
<input type="text" value="wi...
HTML5 best practices; section/header/aside/article elements
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Actually, you are quite right when it comes to header/footer. Here is some basic information on how each of the major HTML5 tags can/should be used (I suggest reading the full source linked at the bottom):
section – Used ...