大约有 45,000 项符合查询结果（耗时：0.0788秒） [XML]
IOException: read failed, socket might closed - Bluetooth on Android 4.3
...eal with a strange Exception when opening a BluetoothSocket on my Nexus 7 (2012), with Android 4.3 (Build JWR66Y, I guess the second 4.3 update). I have seen some related postings (e.g. https://stackoverflow.com/questions/13648373/bluetoothsocket-connect-throwing-exception-read-failed ), but none s...
Find the day of a week
...
df = data.frame(date=c("2012-02-01", "2012-02-01", "2012-02-02"))
df$day <- weekdays(as.Date(df$date))
df
## date day
## 1 2012-02-01 Wednesday
## 2 2012-02-01 Wednesday
## 3 2012-02-02 Thursday
Edit: Just to show another way......
How many parameters are too many? [closed]
...
1
2
Next
162
votes
...
How to determine the number of days in a month in SQL Server?
...
28 Answers
28
Active
...
Comparison of JSON Parser for Objective-C (JSON Framework, YAJL, TouchJSON, etc)
...
johnejohne
6,71222 gold badges2121 silver badges2525 bronze badges
...
Ruby on Rails patterns - decorator vs presenter
...
2 Answers
2
Active
...
How do I get a YouTube video thumbnail from the YouTube API?
...
1
2
Next
4718
...
Why is using the rails default_scope often recommend against?
...explict when wanting to show unpublished (private) posts. So far so good.
2.1.1 :001 > Post.all
Post Load (0.2ms) SELECT "posts".* FROM "posts" WHERE "posts"."published" = 't'
Well this is pretty much what we expect. Now lets try:
2.1.1 :004 > Post.new
=> #<Post id: nil, title:...
How to reset postgres' primary key sequence when it falls out of sync?
...
29 Answers
29
Active
...
Why have header files and .cpp files? [closed]
...
207
Well, the main reason would be for separating the interface from the implementation. The head...