大约有 45,000 项符合查询结果（耗时：0.0422秒） [XML]
Maximum number of records in a MySQL database table
...is before... i just surpassed my 64 terrabyte size on one of my tables and now my system is so slow!
– JM4
Nov 30 '10 at 1:00
...
How to make a copy of a file in android?
...d I found the problem was missing permission to write to external storage. now it works fine.
– A S
Feb 16 '12 at 9:51
8
...
There is no ViewData item of type 'IEnumerable' that has the key 'xxx'
... "text-danger" })
</div>
</div>
Now if we remove this statement:
ViewBag.OperatorId = new SelectList(db.Operators, "OperatorId", "OperatorSign", number.OperatorId);
from back of the following statement (in our controller) :
return View();
we will see ...
How to migrate back from initial migration in Django 1.7?
I created a new app with some models and now I noticed that some of the models are poorly thought out. As I haven't committed the code the sensible thing would be to migrate the database to last good state and redo the migration with better models. In this case the last good state is database where ...
How do I create delegates in Objective-C?
I know how delegates work, and I know how I can use them.
19 Answers
19
...
How can I reverse a NSArray in Objective-C?
... danielpunkass's solution. I used it thinking it was a great shortcut, but now I've just spent 3 hours trying to figure out why my A* algorithm was broken. It's because it returns the wrong set!
– Georg Schölly
Mar 12 '10 at 6:23
...
mingw-w64 threads: posix vs win32
... on Windows and there are two options: win32 threads and posix threads. I know what is the difference between win32 threads and pthreads but I don't understand what is the difference between these two options. I doubt that if I will choose posix threads it will prevent me from calling WinAPI functio...
How can I create directories recursively? [duplicate]
...
I agree with Cat Plus Plus's answer. However, if you know this will only be used on Unix-like OSes, you can use external calls to the shell commands mkdir, chmod, and chown. Make sure to pass extra flags to recursively affect directories:
>>> import subprocess
>>...
Using Node.JS, how do I read a JSON file into (server) memory?
...hings like Mongo, Alfred, etc out there, but that is not what I need right now.
11 Answers
...
LINQ: Distinct values
...
IEqualityComparer<TKey> comparer)
{
HashSet<TKey> knownKeys = new HashSet<TKey>(comparer);
foreach (TSource element in source)
{
if (knownKeys.Add(keySelector(element)))
{
yield return element;
}
}
}
(If you pass...