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How to filter array in subdocument with MongoDB [duplicate]
...er individual elements and then use $group to put it back together:
db.test.aggregate([
{ $match: {_id: ObjectId("512e28984815cbfcb21646a7")}},
{ $unwind: '$list'},
{ $match: {'list.a': {$gt: 3}}},
{ $group: {_id: '$_id', list: {$push: '$list.a'}}}
])
outputs:
{
"result": [
...
Set port for php artisan.php serve
How do we set a custom port for test server?
9 Answers
9
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fstream默认不支持中文路径和输出整数带逗号的解决办法 - C/C++ - 清泛网 -...
...("测试"); //新建一个中文文件夹
ofstream outfile( "测试/test.txt", ios::out ); //创建文件
if( !outfile )
{
cout << "Failed to create file!";
return ;
}
outfile.close();
}
程序将输出创建文件夹失败的信息。
一个解决办法是:在...
Boost智能指针——shared_ptr - C/C++ - 清泛网 - 专注C/C++及内核技术
...}
void do_something() { std::cout << "did something\n"; }
};
void test()
{
boost::shared_ptr<implementation> sp1(new implementation());
std::cout<<"The Sample now has "<<sp1.use_count()<<" references\n";
boost::shared_ptr<implementation> sp2 = sp1;
std::cout<<"The Sam...
AfxIsValidAddress 测试内存地址 - C/C++ - 清泛网 - 专注C/C++及内核技术
AfxIsValidAddress 测试内存地址Tests any memory address to ensure that it is contained entirely within the program& 39;s memory space 测试任何内存 Tests any memory address to ensure that it is contained entirely within the program's memory space.
测试任何内存地址,以确保它...
CFileDialog用法及参数解释 - C/C++ - 清泛网 - 专注C/C++及内核技术
...athName( ) 得到完整的文件名,包括目录名和扩展名如:c:\ test\test1.txt
CString CFileDialog::GetFileName( ) 得到完整的文件名,包括扩展名如:test1.txt
CString CFileDialog::GetFileExt( ) 得到完整的文件扩展名,如:txt
CString CFileDialog::GetFileTitl...
Linux ftp上传文件 实战篇 - 开源 & Github - 清泛网 - 专注IT技能提升
...传下载操作了,命令如下:
ftp> cd /remotedir
ftp> put /home/test remote_test
ftp> get remote_test /home/local_test
QUERY_STRING、REQUEST_URI、SCRIPT_NAME、PHP_SELF区别 - 更多技术 - 清泛...
...
$_SERVER['PHP_SELF'] = "/aaa/index.php";
3、http://localhost/tag/test → http://localhost/index.php?m=tag&tag=test(URL重写)
$_SERVER['QUERY_STRING'] = "m=tag&tag=test";
$_SERVER['REQUEST_URI'] = "/tag/test";
$_SERVER['SCRIPT_NAME'] = "/index.php";
$_SERVER['PHP_SELF'] ...
bat 写注册表 及权限提升 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...):
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\App Paths\Test" /v "Path" /d "c:\test" /f
由于操作注册表需要管理员权限,运行bat也一样,否则:
可以右键“管理员权限运行”,不过这样比较麻烦,使用如下脚本可以直接运行bat...
nsis指定默认安装路径,记住上次安装路径 - 更多技术 - 清泛网 - 专注C/C++...
...安装路径,记住上次安装路径!define PRODUCT_DEFAULT_PATH "C: Test"....InstallDir "${PRODUCT_DEFAULT_PATH}"InstallDirRegKey HKLM "Software Microsoft Windo...!define PRODUCT_DEFAULT_PATH "C:\Test"
....
InstallDir "${PRODUCT_DEFAULT_PATH}"
InstallDirRegKey HKLM "Software\Microsoft\Wind...