大约有 6,887 项符合查询结果（耗时：0.0414秒） [XML]
How to deserialize a list using GSON or another JSON library in Java?
...on extends a class AbstractList and doesn't override the method remove(int index) from the base class. And if you look at the source code of the AbstractList.remove(int index) you would see it always thrown UnsupportedOperationException. The same is for add() method.
– Bogdan K...
Get users by name property using Firebase
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Previously, Firebase required you to generate your own indexes or download all data at a location to find and retrieve elements that matched some child attribute (for example, all users with name === "Alex").
In October 2014, Firebase rolled out new querying functionality via th...
How to define a custom ORDER BY order in mySQL
...HAR etc. Internally MySQL stores the ENUM options in a specific order and indexes them, and so when ordering by an ENUM column specifically it will use that internal index instead of the string values ( unless CAST() is used to make it back to a VARCHAR)
– Simon at My School P...
Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...tion(x) x$z)
## y
## x a b c
## x 1 2 3
## y 3 3 2
Using matrix indexing:
This is kinda old school but is a nice demonstration of matrix indexing, which can be really useful in certain situations.
with(tmp, {
out <- matrix(nrow=nlevels(x), ncol=nlevels(y),
dimnames=...
Python __call__ special method practical example
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I'd rather have a fact object that is indexable since your __call__ function is essentially an index. Also would use a list instead of a dict, but that's just me.
– Chris Lutz
Apr 28 '11 at 20:59
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Use a LIKE statement on SQL Server XML Datatype
...sisted, and then you can search very efficiently on it (heck: you can even INDEX that field!).
Marc
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Why is early return slower than else?
...= (5*j) + 1 + perturb;
perturb >>= 5;
use j % 2**i as the next table index;
which gives it 17 to use as the next index. Fortunately that's free so the loop only repeats once. The hash table size is a power of 2, so 2**i is the size of the hash table, i is the number of bits used from the has...
How would one write object-oriented code in C? [closed]
...u/~ats/books/ooc.pdf other papers from same author: cs.rit.edu/~ats/books/index.html
– pakman
Jul 28 '12 at 0:33
10
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Django URL Redirect
...directView.as_view(url='<url_to_home_view>', permanent=False), name='index')
)
Notice how as url in the <url_to_home_view> you need to actually specify the url.
permanent=False will return HTTP 302, while permanent=True will return HTTP 301.
Alternatively you can use django.shortcuts...
The following sections have been defined but have not been rendered for the layout page “~/Views/Sha
... also creates a set of five View files: Create, Delete, Details, Edit, and Index. Two of these views, Create and Edit are intended to let the user add/edit data for the fields in database records that underlie the model. For those views in a real app, you will probably want to do some amount of data...