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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...个副本保证了容错性，就算一个副本挂掉了还有很多副本存在，并且解决了上面第一个问题“主节点挂掉了，整个集群内会自动切换”。难怪mongoDB官方推荐使用这种模式。我们来看看mongoDB副本集的架构图：
由图可以看到客户...
How to view the assembly behind the code using Visual C++?
...ng namespace std;
static string my_exe(void){
char buf[MAX_PATH];
DWORD tmp = GetModuleFileNameA( NULL, // self
buf, MAX_PATH);
return buf;
}
int main() {
string dircmd = "dir ";
boost::filesystem::path p( my_exe() );
//boost::filesystem::p...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...据库当中最像关系数据库的。支持类似于面向对象的查询语言，几乎可以实现类似关系数据库单表查询的绝大部分功能，而且还支持对数据建立索引。所以这个非常方便，我们可以用sql操作MongoDB，从关系型数据库迁移过来，开...
总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...static_cast就可以了。至于reinterpret_cast，我很喜欢，很象c语言那样的暴力转换：）
dynamic_cast:动态类型转换
static_cast:静态类型转换
reinterpret_cast:重新解释类型转换
const_cast:常量类型转换
专业的上面很多了,我说说我自己...
What does a type followed by _t (underscore-t) represent?
...stom defined types that are explicit, such as BYTE WORD (normally 16-bit) DWORD (32-bits).
int_t is not so good, because the definition of int varies between platforms -- so whose int are you conforming to? (Although, these days, most PC-centric development treats it as 32 bits, much stuff for ...
What is the best way to find the users home directory in Java?
...LT SHGetFolderPath( HWND hwndOwner, int nFolder, HANDLE hToken,
* DWORD dwFlags, LPTSTR pszPath);
*/
public int SHGetFolderPath(HWND hwndOwner, int nFolder, HANDLE hToken,
int dwFlags, char[] pszPath);
}
}
...
Capture characters from standard input without waiting for enter to be pressed
...ct if there's any input,
HANDLE handle = GetStdHandle(STD_INPUT_HANDLE);
DWORD events;
INPUT_RECORD buffer;
PeekConsoleInput( handle, &buffer, 1, &events );
then use ReadConsoleInput to "consume" the input character ..
PeekConsoleInput(handle, &buffer, 1, &events);
if(events >...
How do you get assembler output from C/C++ source in gcc?
...x into the more readable nasm syntax:
#!/usr/bin/perl -w
$ptr='(BYTE|WORD|DWORD|QWORD|XMMWORD) PTR ';
$reg='(?:[er]?(?:[abcd]x|[sd]i|[sb]p)|[abcd][hl]|r1?[0-589][dwb]?|mm[0-7]|xmm1?[0-9])';
open FH, '-|', '/usr/bin/objdump', '-w', '-M', 'intel', @ARGV or die;
$prev = "";
while(<FH>){
if(/...
Algorithm to get the excel-like column name of a number
...n-letters-2
*
* @param int $num 欄數
* @param bool $uppercase 大小寫
* @return void
*/
function num_to_letters($n)
{
$n -= 1;
for ($r = ""; $n >= 0; $n = intval($n / 26) - 1)
$r = chr($n % 26 + 0x41) . $r;
return $r;
}
ex:
echo num_to_letters(1); ...
'Operation is not valid due to the current state of the object' error during postback
...changed in the registry rather than a config file. It should be added as a DWORD named MaxHttpCollectionKeys in the registry under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET\1.1.4322.0
for 32-bit editions of Windows, and
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\ASP.NET\1.1.4322.0
...