大约有 30,000 项符合查询结果（耗时：0.0424秒） [XML]
Why is 1/1/1970 the “epoch time”?
...less than 829 days. For this reason, the time represented by the number 0 (called the epoch) had to be set in the very recent past. As this was in the early 1970s, the epoch was set to 1971-1-1.
Later, the system time was changed to increment every second, which increased the span of time that coul...
Selecting data from two different servers in SQL Server
...addlinkedserver.
You only have to set up one. Once you have that, you can call a table on the other server like so:
select
*
from
LocalTable,
[OtherServerName].[OtherDB].[dbo].[OtherTable]
Note that the owner isn't always dbo, so make sure to replace it with whatever schema you use.
...
What is Serialization?
...mammal. How am I meant to convey a puppy over the phone line? I can't physically put my puppy into my phone receiver.
So instead, I'll have to convey a representation of the puppy over the phone. In other words, I then serialize my dog Rex, and I send him the serialized version of Rex over the phone...
Initialization of all elements of an array to one default value in C++?
...array during runtime. If you really need the initialization to happen statically, it's possible to use variadic templates and variadic sequences to generate the desired sequence of ints and expand it into the initializer of the array.
– void-pointer
Jun 2 '13 a...
What happens when a duplicate key is put into a HashMap?
...on supports null values.)
So if you don't assign the returned value when calling mymap.put("1", "a string"), it just becomes unreferenced and thus eligible for garbage collection.
share
|
improve ...
Number of days between two dates in Joda-Time
...Unit.MILLISECONDS.toDays(later.getMillis()- earlier.getMillis());
}
By calling getMillis() you use already existing variables.
MILLISECONDS.toDays() then, uses a simple arithmetic calculation, does not create any object.
...
Why does !{}[true] evaluate to true in JavaScript?
...of which a property is being accessed". I don't know if the first is technically a case of ASI (many languages wouldn't put a semi-colon there anyway) but it's the context-sensitive interpretation that's the heart of the issue.
– IMSoP
Oct 31 '13 at 9:55
...
Calculate the execution time of a method
...uch as JITing) causes varying execution times to occur. Therefore, realistically, for accurate measurements, the OP should be using a performance profiler.
– Matthew Layton
Dec 24 '12 at 9:56
...
How to print colored text in Python?
... these ANSI characters from stdout and converts them into equivalent win32 calls for colored text. On other platforms, Colorama does nothing. Hence you can use ANSI codes, or modules like Termcolor, and with Colorama, they 'just work' on all platforms. Is that idea, anyhow.
– J...
Changing MongoDB data store directory
...stallation, you can also configure the mongod.conf file to do this automatically:
# Store data in /usr/local/var/mongodb instead of the default /data/db
dbpath = /usr/local/var/mongodb
The official 10gen Linux packages (Ubuntu/Debian or CentOS/Fedora) ship with a basic configuration file which is...