大约有 4,700 项符合查询结果（耗时：0.0129秒） [XML]
sql primary key and index
... alternate index on that column, then drop the default index.
Now for the fun part--when do you NOT want a unique primary key index? You don't want one, and can't tolerate one, when your table acquires enough data (rows) to make the maintenance of the index too expensive. This varies based on the...
Getting activity from context in android
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And in Kotlin:
tailrec fun Context.activity(): Activity? = when {
this is Activity -> this
else -> (this as? ContextWrapper)?.baseContext?.activity()
}
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Get all files that have been modified in git branch
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ah! this is good fun, now how about if I want to have say <notMainDev> be the current branch I'm on. that is not have to specify it?
– Raif
May 17 '12 at 19:07
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How do you share code between projects/solutions in Visual Studio?
...forward to deploy a separate DLL into SharePoint. In order to share common functionality between InfoPath forms the linked class file approach is very useful. It is placed one level above the individual form projects and everything is source controlled at the root level.
– Oliv...
Creating a JSON response using Django and Python
... some discussion of the issue github.com/blueimp/jQuery-File-Upload/issues/123
– Victory
Apr 25 '14 at 22:05
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How to check whether a Storage item is set?
... use hasOwnProperty method to check this
> localStorage.setItem('foo', 123)
undefined
> localStorage.hasOwnProperty('foo')
true
> localStorage.hasOwnProperty('bar')
false
Works in current versions of Chrome(Mac), Firefox(Mac) and Safari.
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How can I loop through a C++ map of maps?
...sal (by luminaries Bjarne Stroustrup, Herb Sutter and Gabriel Dos Reis) is fun to read (and the suggested syntax is more intuitive IMHO); there's also the proposed wording for the standard which is boring to read but is closer to what will actually go in.
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Regular Expression: Any character that is NOT a letter or number
... is the simplest one: \D - matches all non digit characters.
var x = "123 235-25%";
x.replace(/\D/g, '');
Results in x: "12323525"
See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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A Regex that will never be matched by anything
... I had a long talk with some of my fellow developers and it sounded like a fun thing to think of.
26 Answers
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Regex using javascript to return just numbers
... the non-digit characters (\D or [^0-9]):
let word_With_Numbers = 'abc123c def4567hij89'
let word_Without_Numbers = word_With_Numbers.replace(/\D/g, '');
console.log(word_Without_Numbers)
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