大约有 42,000 项符合查询结果（耗时：0.0821秒） [XML]
MIN/MAX vs ORDER BY and LIMIT
...d field, using MIN() requires a single full pass of the table. Using SORT and LIMIT requires a filesort. If run against a large table, there would likely be a significant difference in percieved performance. As a meaningless data point, MIN() took .36s while SORT and LIMIT took .84s against a 106...
Order of items in classes: Fields, Properties, Constructors, Methods
... the ordering is as follows.
Within a class, struct or interface: (SA1201 and SA1203)
Constant Fields
Fields
Constructors
Finalizers (Destructors)
Delegates
Events
Enums
Interfaces (interface implementations)
Properties
Indexers
Methods
Structs
Classes
Within each of these groups order by acces...
Why are arrays of references illegal?
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Answering to your question about standard I can cite the C++ Standard §8.3.2/4:
There shall be no references to references, no arrays of references, and no pointers to references.
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Best TCP port number range for internal applications [closed]
...re each of our internal applications runs on an individual Tomcat instance and uses a specific TCP port. What would be the best IANA port range to use for these apps in order to avoid port number collisions with any other process on the server?
...
Optimal number of threads per core
Let's say I have a 4-core CPU, and I want to run some process in the minimum amount of time. The process is ideally parallelizable, so I can run chunks of it on an infinite number of threads and each thread takes the same amount of time.
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Remove non-numeric characters (except periods and commas) from a string
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You could use preg_replace to swap out all non-numeric characters and the comma and period/full stop as follows:
$testString = '12.322,11T';
echo preg_replace('/[^0-9,.]+/', '', $testString);
The pattern can also be expressed as /[^\d,.]+/
...
Programmatic equivalent of default(Type)
I'm using reflection to loop through a Type 's properties and set certain types to their default. Now, I could do a switch on the type and set the default(Type) explicitly, but I'd rather do it in one line. Is there a programmatic equivalent of default?
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Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?
...the other posts on tracking down the reasons for getting a SIGSEGV in an Android app. I plan to scour my app for possible NullPointers related to Canvas use, but my SIGSEGV barfs up a different memory address each time. Plus I've seen code=1 and code=2 . If the memory address was 0x00000000 ...
Error : The service is invalid
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Xcode and the GDB connection is quite temperamental. The device and your Mac can become unsynchronised with each other. My checklist for this sort of thing:
Restart Xcode.
Delete the .app from your iOS device, do a Clean then Reb...
How do I redirect in expressjs while passing some context?
...gs. You'll need to ensure that the values are properly encodeURIComponent and decodeURIComponent.
app.get('/category', function(req, res) {
var string = encodeURIComponent('something that would break');
res.redirect('/?valid=' + string);
});
You can snag that in your other route by getting t...