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Which MySQL data type to use for storing boolean values
... @JamesHalsall: Actually, BIT(1) and TINYINT(1) will both use one byte of storage. Up until MySQL 5.0.3, BIT was actually a synonym for TINYINT. Later versions of MySQL changed the implementation of BIT. But even with the implementation change, there's still no "storage size" benefit to...
Java FileReader encoding issue
... no general way to guess the encoding of any given "plain text" file.
The one-arguments constructors of FileReader always use the platform default encoding which is generally a bad idea.
Since Java 11 FileReader has also gained constructors that accept an encoding: new FileReader(file, charset) an...
Performing regex Queries with pymongo
...ry this:
import re
regx = re.compile("^foo", re.IGNORECASE)
db.users.find_one({"files": regx})
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What's the best way to get the last element of an array without deleting it?
...on 10. $x = $array[array_key_last($array)]; (as suggested by Quasimodo's clone ; available per PHP 7.3)
(functions mentioned: array_key_last , array_keys , array_pop , array_slice , array_values , count , end , reset)
The test inputs (<<input code>>s) to combine with:
null = $array...
What are the main purposes of using std::forward and which problems it solves?
...compiler to do for us in C++11.)
In C++11, we get a chance to fix this. One solution modifies template deduction rules on existing types, but this potentially breaks a great deal of code. So we have to find another way.
The solution is to instead use the newly added rvalue-references; we can int...
Find out what process registered a global hotkey? (Windows API)
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Your question piqued my interest, so I've done a bit of digging and while, unfortunately I don't have a proper answer for you, I thought I'd share what I have.
I found this example of creating keyboard hook (in Delphi) written in 1998, but is compilable in Delphi 200...
Terminating a script in PowerShell
...is an old post but I find myself coming back to this thread a lot as it is one of the top search results when searching for this topic. However, I always leave more confused then when I came due to the conflicting information. Ultimately I always have to perform my own tests to figure it out. So thi...
Converting file size in bytes to human-readable string
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Here's one I wrote:
function humanFileSize(bytes, si=false, dp=1) {
const thresh = si ? 1000 : 1024;
if (Math.abs(bytes) < thresh) {
return bytes + ' B';
}
const units = si
? ['kB', 'MB', 'GB', 'TB...
Is a Java hashmap search really O(1)?
...esting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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In Postgresql, force unique on combination of two columns
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Is it possible to enforce a unique constraint on just one permutation, such as unique(col1, col2 = '1')?
– Vikram Khemlani
Nov 12 '19 at 19:20
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