大约有 3,285 项符合查询结果（耗时：0.0418秒） [XML]
What are the options for storing hierarchical data in a relational database? [closed]
...ust need a branch's id to insert a new item to it) and also query it quite fast.
+-------------+----------------------+--------+-----+-----+
| category_id | name | parent | lft | rgt |
+-------------+----------------------+--------+-----+-----+
| 1 | ELECTRONICS |...
How to show popup message like in Stack Overflow
...te, etc. For the hovering dialogs that you get when you try to comment too fast, vote for your own question, etc, check out this question where I show how to do this or just go straight to the example.
Here's how Stackoverflow does it:
This is the markup, initially hidden so we can fade it in:
...
For each row return the column name of the largest value
...),V3=c(9,6,4))
colnames(DF)[apply(DF,1,which.max)]
[1] "V3" "V1" "V2"
A faster solution than using apply might be max.col:
colnames(DF)[max.col(DF,ties.method="first")]
#[1] "V3" "V1" "V2"
...where ties.method can be any of "random" "first" or "last"
This of course causes issues if you happen...
Are JavaScript strings immutable? Do I need a “string builder” in JavaScript?
...ve always heard what Ash mentioned in his answer (that using Array.join is faster for concatenation) so I wanted to test out the different methods of concatenating strings and abstracting the fastest way into a StringBuilder. I wrote some tests to see if this is true (it isn't!).
This was what I be...
What are the primary differences between Haskell and F#? [closed]
...les some nice tricks and makes some things that look slow actually execute fast. But I find it a lot harder to guess how fast my code will run. Both languages let you use the other model, you just have to be explicit about it in your code.
Minor differences:
Syntax : Haskell has slightly nicer sy...
How do I 'overwrite', rather than 'merge', a branch on another branch in Git?
...ourth step of merging with the ours strategy, the push is considered a non-fast-forward update and will be rejected (by GitHub).
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Xcode 4 - slow performance
... Contents.
Next, delete project.xcworkspace.
Open Xcode and enjoy faster performance!
Thanks to:
http://meachware.blogspot.com/2011/06/speed-up-xcode-4.html
Edit: I've gotten several comments about this noting that for some projects this might cause problems. Make sure you have a backup...
TCP loopback connection vs Unix Domain Socket performance
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Yes, local interprocess communication by unix domain sockets should be faster than communication by loopback localhost connections because you have less TCP overhead, see here.
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Remove specific commit
...cause git don't allow you to edit what you want to), you can use this very fast open source application: reposurgeon.
Note: of course, all these changes are done locally, you should git push afterwards to apply the changes to the remote. And in case your repo doesn't want to remove the commit ("no...
Why does C++ compilation take so long?
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Regarding point 3: C compilation is noticably faster than C++. It's definitely the frontend that causes the slowdown, and not the code generation.
– Tom
Dec 7 '08 at 7:02
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