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What is the maximum length of data I can put in a BLOB column in MySQL?
...f the
communications buffers
I think the first site gets their answers from interpreting the MySQL manual, per http://dev.mysql.com/doc/refman/5.0/en/storage-requirements.html
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Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
... machine and this is one of the places where that abstraction is leaking.
From the perspective of the computer, a function is just a memory address which, if executed, performs other instructions. So a function in C is itself modelled as an address, which probably leads to the design that a functio...
How to turn off CodeLens-References
...estion where to look. But I thought I'd leave this comment in case anybody from Microsoft comes along. IMHO clutter is undesirable and you could have that same information in a rollover popup.
– Code Dude
Dec 20 '18 at 20:07
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Checking if array is multidimensional or not?
...ltidimensional';
}
This option second value mode was added in PHP 4.2.0. From the PHP Docs:
If the optional mode parameter is set to COUNT_RECURSIVE (or 1), count() will recursively count the array. This is particularly useful for counting all the elements of a multidimensional array. count() ...
Reuse a parameter in String.format?
...
From the docs:
The format specifiers for general, character, and numeric types have the following syntax:
%[argument_index$][flags][width][.precision]conversion
The optional argument_index is a decimal integ...
Most efficient conversion of ResultSet to JSON?
... print the Json data directly on an output stream as soon as we fetch them from the ResultSet: the already written data will be garbage collected since we don't need an array that keeps them in memory.
I use GSON that accepts type adapters. I wrote a type adapter to convert ResultSet to JsonArray ...
What is “2's Complement”?
...ill overflow.
98
99
00
We have two digits and can represent all numbers from 0 to 100. All those numbers are positive! Suppose we want to represent negative numbers too?
What we really have is a cycle. The number before 2 is 1. The number before 1 is 0. The number before 0 is... 99.
So, for sim...
What is the best way to clear a session variable in rails?
...)
In general, session variable is SessionHash object, which is inherited from hash.
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How is attr_accessible used in Rails 4?
...eat explanation. It seems like in practice, though, this moves Rails away from fat model, thin controller, etc, and towards thin models, and really bloated controllers. You have to write all this stuff for every instance, it doesn't read nicely, and nesting seems to be a pain. The old attr_access...
Reference assignment operator in PHP, =&
... = &$someVar (ampersand dollar sign variable name). Example simplified from the docs:
$a = 3;
$b = &$a;
$a = 4;
print "$b"; // prints 4
Here's a handy link to a detailed section on Assign By Reference in the PHP manual. That page is part of a series on references - it's worth taking a m...