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What's the $unwind operator in MongoDB?
...e" ,
author : "bob" ,
posted : new Date () ,
pageViews : 5 ,
tags : [ "fun" , "good" , "fun" ] ,
comments : [
{ author :"joe" , text : "this is cool" } ,
{ author :"sam" , text : "this is bad" }
],
other : { foo : 5 }
}
Notice how tags is actually an array of 3 ite...
https connection using CURL from command line
...ificate:
* subject: C=US; ST=California; L=Mountain View; O=Google Inc; CN=www.google.com
* start date: 2016-01-07 11:34:33 GMT
* expire date: 2016-04-06 00:00:00 GMT
* issuer: C=US; O=Google Inc; CN=Google Internet Authority G2
* SSL certificate verify ok.
* Server GFE/2.0 is not bla...
How to know what the 'errno' means?
... not thread safe while strerror_r() is thread safe. MT-Safe or Thread-Safe functions are safe to call in the presence of other threads. MT, in MT-Safe, stands for Multi Thread. -p26, The GNU C Library char * strerror(int errnum ) [Function] Preliminary: | MT-Unsafe race:strerror | AS-Unsafe heap i18...
Load RSA public key from file
...ce;
}
/**
* Returns a CSR as string
* @param cn Common Name
* @param OU Organizational Unit
* @param Org Organization
* @param LocName Location name
* @param Statename State/Territory/Province/Region
* @param Country Country
*...
Should I Dispose() DataSet and DataTable?
... lot of folks use a using statement for IDisposables. using (SqlConnection cn = new SqlConnection(connectionString)) { using (SqlCommand cm = new SqlCommand(commandString, cn)) { cn.Open(); cm.ExecuteNonQuery(); } }
– DOK
May 19 '14 at 16:07
...
What are the advantages of using nullptr?
...ere doesn't seem to be an advantage. But consider the following overloaded functions:
void f(char const *ptr);
void f(int v);
f(NULL); //which function will be called?
Which function will be called? Of course, the intention here is to call f(char const *), but in reality f(int) will be called! ...
What's the best practice to round a float to 2 decimals? [duplicate]
...s 0. Do you know how to show always sign and all (2) decimals?? Example: 2.1234 --> 2.12 but 2.1 --> 2.1 but no 2.10
– vgonisanz
Jan 18 '12 at 14:36
1
...
How to run a process with a timeout in Bash? [duplicate]
...ld be missing from anything that is FreeBSD, NetBSD, OS X, HP/UX, Solaris, AIX, etc.
– Graham
Apr 19 '12 at 22:32
3
...
How to preserve insertion order in HashMap? [duplicate]
...tee that the order will remain constant over time.
Perhaps you can do as aix suggests and use a LinkedHashMap, or another ordered collection. This link can help you find the most appropriate collection to use.
share
...
Detecting Windows or Linux? [duplicate]
...{
return (OS.contains("nix") || OS.contains("nux") || OS.contains("aix"));
}
public static boolean isSolaris() {
return OS.contains("sunos");
}
public static String getOS(){
if (isWindows()) {
return "win";
} else if (isMac()) {
...