大约有 47,000 项符合查询结果（耗时：0.0688秒） [XML]
Subdomain on different host [closed]
...e domain e.g
mydomain.com has IP 123.456.789.999 and hosted with Godaddy. Now to get the sub domain
anothersite.mydomain.com
of which the site is actually on another server then
login to Godaddy and add an A record dnsimple anothersite.mydomain.com and point the IP to the other server 98.22.11.1...
Is it possible to make abstract classes in Python?
...class is already established as abstract shouldn't the compiler/interpret know that all the methods are from the abstract class in question?
– Charlie Parker
Mar 17 '14 at 3:30
35
...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...s (also rows). In other words, Car → Wheel is a 1-to-many relationship.
Now, let's say you need to iterate through all the cars, and for each one, print out a list of the wheels. The naive O/R implementation would do the following:
SELECT * FROM Cars;
And then for each Car:
SELECT * FROM Wheel W...
What's the fastest way to loop through an array in JavaScript?
...
The blog post this answer is based on is now almost 4 years old, and a lot has changed in js engines in that time, see my answer below for an updated comparison.
– jondavidjohn
Aug 31 '11 at 3:01
...
How does variable assignment work in JavaScript?
... example, you are assigning a brand new object.
a = b = {};
a and b are now pointers to the same object. So when you do:
a.foo = 'bar';
It sets b.foo as well since a and b point to the same object.
However!
If you do this instead:
a = 'bar';
you are saying that a points to a different ob...
Export a stash to another computer
...a remote on computer 2:
git remote add pc1 user@computer1:/path/to/repo
now you can retrieve the remote information using
git fetch pc1
now you can import the commit in the way you want; using git cherry-pick, git rebase or whatever you like...
If you want it to look like you just did git stas...
On - window.location.hash - Change?
...pport, however you DO need to do some magic, in form of a somewhat lesser known jQuery feature jQuery special events.
With this feature you essentially get to run some setup code for any event, the first time somebody attempts to use the event in any way (such as binding to the event).
In this set...
Update multiple rows in same query using PostgreSQL
...ate table results_dummy (id int, status text, created_at timestamp default now(), updated_at timestamp default now());
-- populate table with dummy rows
insert into results_dummy
(id, status)
select unnest(array[1,2,3,4,5]::int[]) as id, unnest(array['a','b','c','d','e']::text[]) as status;
select ...
String is immutable. What exactly is the meaning? [duplicate]
...efore coming to any conclusion.
This is how String works:
String str = "knowledge";
This, as usual, creates a string containing "knowledge" and assigns it a reference str. Simple enough? Lets perform some more functions:
String s = str; // assigns a new reference to the same string "knowle...
Are static class variables possible in Python?
...f),return type(self)._i, @i.setter, def i(self,val):, type(self)._i = val. Now you can do x = Test(), x.i = 12, assert x.i == Test.i.
– Rick supports Monica
Dec 19 '14 at 15:05
...