大约有 13,700 项符合查询结果（耗时：0.0187秒） [XML]
Check that Field Exists with MongoDB
...
Suppose we have a collection like below:
{
"_id":"1234"
"open":"Yes"
"things":{
"paper":1234
"bottle":"Available"
"bottle_count":40
}
}
We want to know if the bottle field is present or not?
Ans:
db.products.f...
What is the difference between Scala's case class and class?
...case Node(left, EmptyLeaf) => println("Can be reduced to "+left)
case _ => println(treeA+" cannot be reduced")
}
// Pattern matches can be safely done, because the compiler warns about
// non-exaustive matches:
def checkTree(t: Tree) = t match {
case Node(EmptyLeaf, Node(left, right)) =&g...
How do I resolve a HTTP 414 “Request URI too long” error?
...e the sanitize posted data remark) and
http://www.openjs.com/articles/ajax_xmlhttp_using_post.php
Basically, the difference is that the GET request has the url and parameters in one string and then sends null:
http.open("GET", url+"?"+params, true);
http.send(null);
whereas the POST request sen...
Split Strings into words with multiple word boundary delimiters
...erscores too, something the findall solution does not: print re.split("\W+|_", "Testing this_thing")' yields: ['Testing', 'this', 'thing']
– Emil Stenström
Jan 5 '12 at 0:26
66
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Set default CRAN mirror permanent in R
...?Startup:
The
path of this file is taken from the value of the R_PROFILE
environment variable (after tilde expansion). If this variable is
unset, the default is R_HOME/etc/Rprofile.site, which is used if
it exists (which it does not in a 'factory-fresh' installation)...
How to make an HTTP request + basic auth in Swift
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go plain for SWIFT 3 and APACHE simple Auth:
func urlSession(_ session: URLSession, task: URLSessionTask,
didReceive challenge: URLAuthenticationChallenge,
completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
...
UITextField text change event
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Add _ before textField in textFieldDidChange like this: func textFieldDidChange(textField: UITextField) { ... }
– Makalele
Jan 2 '17 at 23:32
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Does Java read integers in little endian or big endian?
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According to h30097.www3.hp.com/docs//base_doc/DOCUMENTATION/V51_HTML/MAN/… its part of the standard c library, yes
– Egil
Dec 12 '08 at 10:49
1
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How do I escape a percentage sign in T-SQL?
... You can escape also the underscore wildcard character too: [_]. How do you escape the open square bracket then? Like this: [[]. sqlserver2000.databases.aspfaq.com/…
– Csaba Toth
Apr 3 '14 at 18:25
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Multiple line code example in Javadoc comment
...ls to parse it correctly:( At least this is what I see with Oracle JDK1.7.0_45 javadoc implementation.
– Male
Jan 3 '14 at 16:14
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