大约有 49,000 项符合查询结果（耗时：0.0633秒） [XML]
What is the “Execute Around” idiom?
...ream) throws IOException;
}
// Somewhere else
public void executeWithFile(String filename, InputStreamAction action)
throws IOException
{
InputStream stream = new FileInputStream(filename);
try {
action.useStream(stream);
} finally {
stream.close();
}
}
// ...
Rails: fields_for with index?
....
Update: It seems that my answer wasn't clear enough...
Original HTML File:
<!-- Main ERB File -->
<% f.fields_for :questions do |builder| %>
<%= render 'some_form', :f => builder %>
<% end %>
Rendered Sub-Form:
<!-- _some_form.html.erb -->
<%= f.opti...
Join vs. sub-query
...s above 100,000. The thing seems to be memory usage and paging to the swap-file. A join would produce a very big amount of data, that may not fit into memory and must be paged into the swap-file. Whenever this is the case the query-times of small sub-selects like select * from a where a.x = (select ...
how to delete all commit history in github? [duplicate]
...he following:
Checkout
git checkout --orphan latest_branch
Add all the files
git add -A
Commit the changes
git commit -am "commit message"
Delete the branch
git branch -D master
Rename the current branch to master
git branch -m master
Finally, force update your repository
git push -f origin...
EXC_BAD_ACCESS signal received
...now use Instruments to debug Leaks. From Xcode 4.2, choose Product->Profile and when Instruments launches, choose "Zombies".
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How Do I 'git fetch' and 'git merge' from a Remote Tracking Branch (like 'git pull')
...B.remote = remoteR.
Think of 'refs' as C++ pointers. Physically, they are files containing SHA-digests, but basically they are just pointers into the commit tree. git fetch will add many nodes to your commit-tree, but how git decides what pointers to move is a bit complicated.
As mentioned in anot...
What do the numbers in a version typically represent (i.e. v1.9.0.1)?
...ngs. For example, some systems increase parts of the version number when a file format changes. So V 1.2.1 is file format compatible with all other V 1.2 versions (1.2.2, 1.2.3, etc.) but not with V 1.3. Ultimately it's up to you what scheme you want to use.
...
How do I get java logging output to appear on a single line?
...ead of the format you expected - that means the setting in your properties file did not found your formatter class, you can do 2 things: 1. make sure your class is in a package and set the formatter property to that class and package 2. make sure your class has a unique name like "MyFormatter", last...
When should I use Inline vs. External Javascript?
...ake it matter) or if your content changes so often that caching the script files has no benefit.
– Konrad Rudolph
Apr 13 '12 at 10:30
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Combining multiple commits before pushing in Git [duplicate]
...ter
This will bring up your text editor (-i is for "interactive") with a file that looks like this:
pick 16b5fcc Code in, tests not passing
pick c964dea Getting closer
pick 06cf8ee Something changed
pick 396b4a3 Tests pass
pick 9be7fdb Better comments
pick 7dba9cb All done
Change all the pick t...