大约有 45,000 项符合查询结果（耗时：0.0553秒） [XML]
Rails 3 check if attribute changed
Need to check if a block of attributes has changed before update in Rails 3.
5 Answers
...
How do I negate a test with regular expressions in a bash script?
...or example, I would like to conditionally add a path to the PATH variable, if the path is not already there, as in:
5 Answe...
Fork and synchronize Google Code Subversion repository into GitHub
...ote add origin git@github.com:example/example.git
git push origin master
Now that you have this, occasionally you will have to synchronise the Subversion repository with Git. It'll look something like:
git svn rebase
git push
In gitk or whatever, this would look something like this:
o [master]...
Drawable image on a canvas
...ly bitmaps. And it also means that you can re-use that same drawable again if only the size changes.
share
|
improve this answer
|
follow
|
...
Including all the jars in a directory within the Java classpath
...my.package.MainClass
This is similar to Windows, but uses : instead of ;. If you cannot use wildcards, bash allows the following syntax (where lib is the directory containing all the Java archive files):
java -cp "$(printf %s: lib/*.jar)"
(Note that using a classpath is incompatible with the -jar...
Spark java.lang.OutOfMemoryError: Java heap space
...
I have a few suggestions:
If your nodes are configured to have 6g maximum for Spark (and are leaving a little for other processes), then use 6g rather than 4g, spark.executor.memory=6g. Make sure you're using as much memory as possible by checking the...
Best Timer for using in a Windows service
....
Console.WriteLine("{0} Creating timer.\n",
DateTime.Now.ToString("h:mm:ss.fff"));
Timer stateTimer =
new Timer(timerDelegate, autoEvent, 1000, 250);
// When autoEvent signals, change the period to every
// 1/2 second.
autoEven...
Android, How can I Convert String to Date?
...
if your SDK version greater or equal to Marshmallow then use like this SimpleDateFormat dateFormat =new SimpleDateFormat(""yyyy-MM-dd'T'HH:mm:ss'Z'"", Locale.getDefault());
– Dheeraj Jaiswal
...
SQL Server - transactions roll back on error?
...
@AlexMcMillan The DROP PROCEDURE statement modifies the database structure, unlike INSERT, which just works with the data. So it cannot be wrapped in a transaction. I'm oversimplifying, but basically that's how it is.
– eksortso
Jun...
RAII and smart pointers in C++
... should be anyway), closing the file is taken care of for us. So, our code now looks something like:
File file("/path/to/file");
// Do stuff with file
// No need to close it - destructor will do that for us
This cannot be done in Java since there's no guarantee when the object will be destroyed, ...