大约有 47,000 项符合查询结果（耗时：0.0496秒） [XML]
Comparing two dataframes and getting the differences
I have two dataframes. Examples:
13 Answers
13
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Check play state of AVPlayer
... addObserver:<self>
selector:@selector(<#The selector name#>)
name:AVPlayerItemDidPlayToEndTimeNotification
object:<#A player item#>];
And to track playing you can:
"track changes in the position of the playhead in an AVPlayer object" by using addPeriodicT...
Best XML Parser for PHP [duplicate]
... an extension, written in C, and is very fast. But second, the parsed document takes the form of a PHP object. So you can "query" like $root->myElement.
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How to set a default value for a datetime column to record creation time in a migration?
...::Migration[5.0]
def change
create_table :posts do |t|
t.datetime :modified_at, default: -> { 'CURRENT_TIMESTAMP' }
t.timestamps
end
end
end
See discussion at https://github.com/rails/rails/issues/27077 and answer there by prathamesh-sonpatki
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The maximum recursion 100 has been exhausted before statement completion
... returned a lot more rows then it should have
– HELP_ME
Mar 10 '12 at 20:59
5
@bugz Maxrecursion ...
What's the difference between commit() and apply() in SharedPreferences
...edPreferences in my android app. I am using both commit() and apply() method from shared preference. When I use AVD 2.3 it shows no error, but when I run the code in AVD 2.1, apply() method shows error.
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Better techniques for trimming leading zeros in SQL Server?
I've been using this for some time:
15 Answers
15
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Maven Install on Mac OS X
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OS X prior to Mavericks (10.9) actually comes with Maven 3 built in.
If you're on OS X Lion, you won't have java installed by default. Just run java by itself and it'll prompt you to install it.
Assuming qualifications are met, run mvn -version and see some outp...
Interface type check with Typescript
...tanceof keyword as you can write custom type guards now:
interface A{
member:string;
}
function instanceOfA(object: any): object is A {
return 'member' in object;
}
var a:any={member:"foobar"};
if (instanceOfA(a)) {
alert(a.member);
}
Lots of Members
If you need to check a lot of ...
How can I log the stdout of a process started by start-stop-daemon?
...
To expand on ypocat's answer, since it won't let me comment:
start-stop-daemon --start --quiet --chuid $DAEMONUSER \
--make-pidfile --pidfile $PIDFILE --background \
--startas /bin/bash -- -c "exec $DAEMON $DAEMON_ARGS > /var/log/some.log 2>&1"
Using...