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MySQL: Fastest way to count number of rows
...ach time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very smart, because you have to send data from mysql to php. Why do it when you can achieve the same on the mysql side?
If the COUNT(*) is slow, you should run EXPLAIN on the query, and check if inde...
Why use apparently meaningless do-while and if-else statements in macros?
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do ... while construct does not have such problem, since the only valid token after the while(0) is a semicolon.
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std::string length() and size() member functions
...having,
size==size of those bits,
In strings both are same if the editor allocates size of character is 1 byte
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Logical operator in a handlebars.js {{#if}} conditional
...to pass the operator as a string or else the compiler will error out while tokenizing your template. {{#ifCond true '==' false}}
– Joe Holloway
Jul 11 '13 at 20:11
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do {…} while(false)
...t way to FORCE a semicolon after the macro invocation, absolutely no other token is allowed to follow.
And another possibility is that there either once was a loop there or iteration is anticipated to be added in the future (e.g. in test-driven development, iteration wasn't needed to pass the tests...
Global variables in Javascript across multiple files
...copy/pasted" into your HTML page before the page is rendered. Or into your PHP page if you will. Please correct me if I'm wrong here. Thanx.
My example files follow:
EXTERNAL JS:
var global = 0;
function f1()
{
alert('fired: f1');
global = 1;
alert('global changed to 1');
}
function...
Types in MySQL: BigInt(20) vs Int(20)
...111000 (length 39 characters)
If you have INT(20) for system this means allocate in memory minimum 20 bits. But if you'll insert value that bigger than 2^20, it will be stored successfully, only if it's less then INT(32) -> 2147483647 (or 2 * INT(32) -> 4294967295 for UNSIGNED)
Example:
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Storing Data in MySQL as JSON
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Yeah, im looking at Mongo, and php has an extension for it and the actual syntax for the DB transactions seems easier than MySQL and the overall working with it seems easier that couchDB. Thanks, I think im going to go with MongoDB :)
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Regular Expression to find a string included between two characters while EXCLUDING the delimiters
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PHP:
$string ='This is the match [more or less]';
preg_match('#\[(.*)\]#', $string, $match);
var_dump($match[1]);
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What is the current choice for doing RPC in Python? [closed]
...you really need a cross-language framework that literally tries to connect PHP to C++ to Java to Python to Erlang to Common Lisp to Haskell to Swift. These are different languages, for a reason, and Thrift needs to do compromises to find a common denominator. I'd argue that the vast majority of peop...