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Why historically do people use 255 not 256 for database field magnitudes?
You often see database fields set to have a magnitude of 255 characters, what is the traditional / historic reason why? I assume it's something to do with paging / memory limits, and performance but the distinction between 255 and 256 has always confused me.
...
vs vs for inline and block code snippets
...ce: (ctrl-U) looks good preceed every line below with %0A)
data:text/html;charset=utf-8,<html >
<script>document.write(window.navigator.userAgent)</script>
<script></script>
<style>
codenza, code {} /* noop mnemonic aide that codenza mimes code tag */
c...
Timer function to provide time in nano seconds using C++
....h>
#include <iostream>
using namespace std;
int main (int argc, char** argv)
{
// reset the clock
timespec tS;
tS.tv_sec = 0;
tS.tv_nsec = 0;
clock_settime(CLOCK_PROCESS_CPUTIME_ID, &tS);
...
... <code to check for the time to be put here>
...
...
How to convert all tables from MyISAM into InnoDB?
...database here first
//
// Actual code starts here
$sql = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'your_database_name'
AND ENGINE = 'MyISAM'";
$rs = mysql_query($sql);
while($row = mysql_fetch_array($rs))
{
$tbl = ...
How to use a class from one C# project with another C# project
...Explorer' tree, expand the P2 project and then right-click the project and select 'Add Reference' from the menu.
On the 'Add Reference' dialog, select the 'Projects' tab and select your P1 project.
If you are using namespaces then you will need to import the namespaces for your P1 types by adding ...
jQuery Selector: Id Ends With?
Is there a selector that I can query for elements with an ID that ends with a given string?
9 Answers
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C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...&15;
printf("a=%d\tb=%d\n",a,b);
}
请再看一例!
main(){
char a='a',b='b';
int p,c,d;
p=a;
p=(p<<8)|b;
d=p&0xff;
c=(p&0xff00)>>8;
printf("a=%d\nb=%d\nc=%d\nd=%d\n",a,b,c,d);
}
六、 右移运算符(>>)
1、运算规则
用来将一个...
Android: How to bind spinner to custom object list?
... has its own ID (the IDs are not equal to display sequence). When the user selects the name from the list the variable currentID has to be changed.
...
What would be the Unicode character for big bullet in the middle of the character?
... These links contain some more info like HTML entities for these four characters: fileformat.info/info/unicode/char/25cf fileformat.info/info/unicode/char/26ab fileformat.info/info/unicode/char/2b24 fileformat.info/info/unicode/char/1f311
– D Coetzee
Aug 3...
How to sort an IEnumerable
...r
var result = from s in myEnumerable
orderby s
select s;
or (ignoring case)
var result = myEnumerable.OrderBy(s => s,
StringComparer.CurrentCultureIgnoreCase);
Note that, as is usual with LINQ, this creates a new IEnumerable<T&...