大约有 40,000 项符合查询结果（耗时：0.0519秒） [XML]
MySQL: Large VARCHAR vs. TEXT?
... message text as either VARCHAR or TEXT. I'm setting a front-end limit of 3000 characters which means the messages would never be inserted into the db as longer than this.
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How do I change the formatting of numbers on an axis with ggplot?
...This is obviously unacceptable, so I want to get it to display them as 500,000, 400,000, and so on. Getting a proper exponent notation would also be acceptable.
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How to get last items of a list in Python?
... python CLI interpreter:
>>> a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a[-9:]
[4, 5, 6, 7, 8, 9, 10, 11, 12]
the important line is a[-9:]
shar...
Try-finally block prevents StackOverflowError
...l into the finally block take twice as long an the stack depth could be
10,000 or more. If you can make 10,000,000 calls per second, this will take 10^3003 seconds or longer than the age of the universe.
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Extracting the last n characters from a string in R
...ge of basically being substr() underneath but has a default end value of 1,000,000.
Examples:
> RIGHT('Hello World!',2)
[1] "d!"
> RIGHT('Hello World!',8)
[1] "o World!"
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What does “xmlns” in XML mean?
...omecity>
<name>London</name>
<lat>123.000</lat>
<long>0.00</long>
</homecity>
</person>
If our two XMLs were combined into a single document, how would we tell the two names apart? As you can see above, there are two na...
java get file size efficiently
...);
}
}
return (System.nanoTime() - before) / 1000;
}
}
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Convert boolean to int in Java
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I just did a test converting 1,000,000 random Boolean values and this method was consistently faster than that based on the ternary operator. It shaved off about 10ms.
– Mapsy
Oct 24 '14 at 13:14
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List comprehension rebinds names even after scope of comprehension. Is this right?
...t a bug.
– Steven Rumbalski
Nov 10 '11 at 20:32
38
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Efficiency of Java “Double Brace Initialization”?
...finitely.
Experiment
Here's the simple experiment I've tested -- make 1000 ArrayLists with the elements "Hello" and "World!" added to them via the add method, using the two methods:
Method 1: Double Brace Initialization
List<String> l = new ArrayList<String>() {{
add("Hello");
...