大约有 19,606 项符合查询结果（耗时：0.0328秒） [XML]
Client-server synchronization pattern / algorithm?
...and distributes the deltas to the clients. This is the typical case. Databases call this "transaction replication".
Client has lost synchronization. Either through a backup/restore or because of a bug. In this case, the client needs to get the current state from the server without going through ...
How can I safely encode a string in Java to use as a filename?
...eason I tend to allow the user to enter what they want, store the filename based on a scheme of my own choosing (eg userId_fileId) and then store the user's filename in a database table. That way you can display it back to the user, store things how you want and you don't compromise security or wipe...
How to rename a single column in a data.frame?
...
How there not a wrapper function for this in base?
– ifly6
Sep 6 '18 at 17:03
1
...
Can I implement an autonomous `self` member type in C++?
...oo)
{
/* ... */
};
You can even do multiple inheritance with as many base classes as you want (thanks to variadic templates and variadic macros):
class WITH_SELF(Foo2)
{
/* ... */
};
class WITH_SELF_DERIVED(Bar2,Foo,Foo2)
{
/* ... */
};
I have verified this to work on gcc 4.8 and c...
Is there a query language for JSON?
...or both together. And XPath 3.1 can too.
The list is growing:
JSONiq (based on XQuery)
UNQL (like SQL)
JaQL (functional)
JsonPath (XPath-like)
Json Query (sort of XPath-like)
GraphQL (template-based, typed)
share
...
Algorithm to get the excel-like column name of a number
...
Here's a nice simple recursive function (Based on zero indexed numbers, meaning 0 == A, 1 == B, etc)...
function getNameFromNumber($num) {
$numeric = $num % 26;
$letter = chr(65 + $numeric);
$num2 = intval($num / 26);
if ($num2 > 0) {
ret...
HTTP 401 - what's an appropriate WWW-Authenticate header value?
...n expiry when Basic Auth is used. I assume you're using some form of Forms based authentication.
From recollection, Windows Challenge Response uses a different scheme and different arguments.
The trick is that it's up to the browser to determine what schemes it supports and how it responds to them...
How to find all the subclasses of a class given its name?
I need a working approach of getting all classes that are inherited from a base class in Python.
10 Answers
...
What is the difference between Caching and Memoization?
...cific form of caching that involves caching the return value of a function based on its parameters.
Caching is a more general term; for example, HTTP caching is caching but not memoization.
Wikipedia says:
Although related to caching, memoization refers to a specific case of this optimization...
NSOperation vs Grand Central Dispatch
...
GCD is a low-level C-based API that enables very simple use of a task-based concurrency model. NSOperation and NSOperationQueue are Objective-C classes that do a similar thing. NSOperation was introduced first, but as of 10.5 and iOS 2, NSOperati...