大约有 45,473 项符合查询结果（耗时：0.0457秒） [XML]
Rails: update_attribute vs update_attributes
Both of these will update an object without having to explicitly tell AR to update.
11 Answers
...
Get screen width and height in Android
...cs.widthPixels;
In a view you need to do something like this:
((Activity) getContext()).getWindowManager()
.getDefaultDisplay()
.getMetrics(displayMetrics);
In some scenarios, where devices have a navigation bar, you have to check at runtim...
How to best display in Terminal a MySQL SELECT returning too many fields?
...
Terminate the query with \G in place of ;. For example:
SELECT * FROM sometable\G
This query displays the rows vertically, like this:
*************************** 1. row ***************************
Host: localhost
...
How does Google Instant work?
Any ideas on exactly how the new google instant search works? It seems to just be AJAX calls to the old search, but it's pretty hard to simplify Google that much. Anybody have speculations?
...
Does name length impact performance in Redis?
...erId was a more expensive operation than using a longer key.
Redis comes with a benchmark utility called redis-benchmark, if you modify the "GET" test in src/redis-benchmark.c so that they key is just "foo", you can run the short key test after a make install:
diff --git a/src/redis-benchmark.c b/...
Set time part of DateTime in ruby
...
Within a Rails environment:
Thanks to ActiveSupport you can use:
DateTime.now.midnight
DateTime.now.beginning_of_day
OR
DateTime.now.change({ hour: 0, min: 0, sec: 0 })
# More concisely
DateTime.now.change({ hour: 0 }) ...
How to clone an InputStream?
...he same information more than once, and the input data is small enough to fit into memory, you can copy the data from your InputStream to a ByteArrayOutputStream.
Then you can obtain the associated array of bytes and open as many "cloned" ByteArrayInputStreams as you like.
ByteArrayOutputStream ba...
How does Angular $q.when work?
...
Calling $q.when takes a promise or any other type, if it is not a promise then it will wrap it in a promise and call resolve. If you pass a value to it then it is never going to be rejected.
From the docs:
Wraps an object that might be a value or a (3rd party) then-able pro...
Installing Numpy on 64bit Windows 7 with Python 2.7.3 [closed]
It looks like the only 64 bit windows installer for Numpy is for Numpy version 1.3.0 which only works with Python 2.6
6 Ans...
Get current batchfile directory
...ch, not the batch file location.
You can get the name of the batch script itself as typed by the user with %0 (e.g. scripts\mybatch.bat). Parameter extensions can be applied to this so %~dp0 will return the Drive and Path to the batch script (e.g. W:\scripts\) and %~f0 will return the full pathname...