大约有 40,000 项符合查询结果（耗时：0.0316秒） [XML]
Efficient SQL test query or validation query that will work across all (or most) databases
...er a little bit of research along with help from some of the answers here:
SELECT 1
H2
MySQL
Microsoft SQL Server (according to NimChimpsky)
PostgreSQL
SQLite
SELECT 1 FROM DUAL
Oracle
SELECT 1 FROM any_existing_table WHERE 1=0
or
SELECT 1 FROM INFORMATION_SCHEMA.SYSTEM_USERS
or
CALL NOW()
HS...
How to convert int to QString?
...t might very well work but internally, the operator+(const QString &s, char c) implementation is called, and the string wont contain the integer as number but its QChar::fromAscii(c) equivalent
– x29a
Jul 23 '15 at 8:19
...
Why would you use an ivar?
..., @"Isabella", @"Ava",
@"Mia", @"Emily", @"Abigail", @"Madison", @"Charlotte"
];
const NSUInteger nameCount = maleNames.count;
assert(maleNames.count == femaleNames.count); // Better be safe than sorry
allAcocuntsA = [NSMutableArray arrayWithCapacity:ammount];
allAccount...
使用NPAPI编写浏览器插件的源码实例(windows 7/linux) - C/C++ - 清泛网 - ...
...tp://code.google.com/p/npapi-headers/
plugin_exec.c中的一些函数
char* NP_GetMIMEDescription()
return的字符串的格式必须是:"text/html:htm,html:HTML Document;application/x-texinfo:tex,texi,texinfo:TexInfo Document;"
详情请看[3]
NPError NP_GetValue (void *future,
NPP...
WSAAsyncSelect模型 - C/C++ - 清泛网 - 专注C/C++及内核技术
... }
break;
case FD_WRITE:
{
}
break;
case FD_READ:
{
char szText[1024]={0};
if(recv(s,szText,1024,0)==-1)
closesocket(s);
else
{
GetDlgItemText(IDC_EDIT1,strContent);
if(!strContent.IsEmpty())
{
strContent+="\r\n";
}
CString s...
SHFileOperation 这个API函数怎么用起来结果飘忽不定？ - C/C++ - 清泛网 -...
...符查找文件，核心代码如下：
WIN32_FIND_DATA FindFileData;
char szCurPath[MAX_PATH + 1] = { 0 };
GetCurrentDirectory(MAX_PATH, szCurPath);
CString findFileName;
findFileName.Format("%stest*.txt", szCurPath);
HANDLE hFind = ::FindFirstFile(findFileName, &FindFileData);
if(INVALI...
GetNextDlgTabItem用法详解，回车替代Tab键切换控件焦点 - C/C++ - 清泛网 ...
... == VK_RETURN)
{
CWnd *wnd = GetFocus();
if (wnd != NULL)
{
char str[256];
CString ClassName = _T("Button");
GetClassName (wnd->m_hWnd, str, 256);
if (ClassName == str)
{
UINT i = wnd->GetDlgCtrlID();
SendMessage (WM_COMMAND, i, (LPARAM)wnd->m_hWnd);
CWn...
c++11右值引用、std::move移动语义、std::forward完美转发的一些总结 - C/C...
...还能拷贝构造，保障代码安全。对于一些基本类型如int和char[10]等，使用std::move()仍然会发生拷贝，因为没有对应的移动构造函数。
对于完美转发而言，右值引用并非“天生神力”，只是c++11新引入了右值，因此为其新定下了引...
SHFileOperation 这个API函数怎么用起来结果飘忽不定？ - c++1y / stl - 清...
...配符查找文件，核心代码如下：
WIN32_FIND_DATA FindFileData;
char szCurPath[MAX_PATH + 1] = { 0 };
GetCurrentDirectory(MAX_PATH, szCurPath);
CString findFileName;
findFileName.Format("%stest*.txt", szCurPath);
HANDLE hFind = ::FindFirstFile(findFileName, &FindFileData);
if...
libunwind：记录程序崩溃堆栈 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...all
记录堆栈的代码如下：
static void log_backtrace(void) {
char name[256];
unw_cursor_t cursor;
unw_context_t uc;
unw_word_t ip, sp, offp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
syslog(LOG_ERR, "--illegal memory access--");
while(unw_step(&cursor) > 0) {...