大约有 15,467 项符合查询结果（耗时：0.0275秒） [XML]
Simple way to calculate median with MySQL
...urning an empty set, but this query worked for me in all situations that I tested it on:
SELECT x.val from data x, data y
GROUP BY x.val
HAVING SUM(SIGN(1-SIGN(y.val-x.val)))/COUNT(*) > .5
LIMIT 1
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Mutex example / tutorial? [closed]
...re guranteed to be atomic. A classic example of such an instruction is the test-and-set (TAS). When trying to acquire a lock on a resource, we might use the TAS might check to see if a value in memory is 0. If it is, that would be our signal that the resource is in use and we do nothing (or more acc...
How to do relative imports in Python?
...
then, one day, need to change name of app to test_app. what would happen? You will need to change all the source codes, import app.package_b.module_b --> test_app.package_b.module_b. this is absolutely BAD practice... And we should try to use relative import within t...
Convert file path to a file URI?
... As a note. Those kind of Uri is clickable in VS output and R# unit tests output at session windows
– AlfeG
Jul 3 '13 at 7:15
8
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Grep and Sed Equivalent for XML Command Line Processing
...ndows, Powershell has built-in functionality for reading and writing XML.
test.xml:
<root>
<one>I like applesauce</one>
<two>You sure bet I do!</two>
</root>
Powershell script:
# load XML file into local variable and cast as XML type.
$doc = [xml](Get-Con...
Is it possible to make anonymous inner classes in Java static?
...hin a static method.
This doesn't actually remove the reference. You can test this by trying to serialize the anonymous class and not making the enclosing class serializable.
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Overload constructor for Scala's Case Classes?
...les inside overloaded constructor? For example: def this(bar: Int) = { val test = 0; this(bar,test) } (this is doesn't work)
– HEX
Oct 15 '13 at 14:52
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PHP: How to use array_filter() to filter array keys?
...), but it does offer the additional flexibility of performing an arbitrary test against the key, e.g. $allowed could contain regex patterns instead of plain strings.
You can also use ARRAY_FILTER_USE_BOTH to have both the value and the key passed to your filter function. Here's a contrived example ...
How to link C++ program with Boost using CMake
...2 xy xy 4.0K May 28 19:23 ./
-rw-rw-r-- 1 xy xy 2.3M May 28 19:23 libboost_test_exec_monitor.a
-rw-rw-r-- 1 xy xy 2.2M May 28 19:23 libboost_unit_test_framework.a
.......
xy@xy:~/boost_install/lib$ ll -th include/
total 20K
drwxrwxr-x 110 xy xy 12K May 28 19:22 boost/
If you are interested in ho...
Unique ways to use the Null Coalescing operator [closed]
...t you can easily convert nullable value types to non-nullable types:
int? test = null;
var result = test ?? 0; // result is int, not int?
I frequently use this in Linq queries:
Dictionary<int, int?> PurchaseQuantities;
// PurchaseQuantities populated via ASP .NET MVC form.
var totalPurchas...