大约有 44,000 项符合查询结果（耗时：0.0180秒） [XML]
How to pull a random record using Django's ORM?
...ust one query (assuming Postgres):
random_instance_or_none = Model.objects.raw('''
select * from {0} limit 1
offset floor(random() * (select count(*) from {0}))
'''.format(Model._meta.db_table)).first()
Be aware that this will raise an index error if the table is empty. Write yourself a mod...
(Mac) -bash: __git_ps1: command not found
... download git-prompt.sh similarly:
curl -o ~/.git-prompt.sh \
https://raw.githubusercontent.com/git/git/master/contrib/completion/git-prompt.sh
... and add the following line to your ~/.bash_profile:
source ~/.git-prompt.sh
Then your PS1 variable that includes __git_ps1 '%s' should work fi...
What is the most effective way for float and double comparison?
...a.org/wiki/IEEE_floating-point_standard.
//
// Template parameter:
//
// RawType: the raw floating-point type (either float or double)
template <typename RawType>
class FloatingPoint {
public:
// Defines the unsigned integer type that has the same size as the
// floating point number.
...
How do I view the SQL generated by the Entity Framework?
...r example:
- Queries, including normal LINQ queries, eSQL queries, and raw queries from methods such as SqlQuery.
- Inserts, updates, and deletes generated as part of SaveChanges
- Relationship loading queries such as those generated by lazy loading
- Parameters
- Whether or not the co...
How can I use Guzzle to send a POST request in JSON?
...
For Guzzle <= 4:
It's a raw post request so putting the JSON in the body solved the problem
$request = $this->client->post(
$url,
[
'content-type' => 'application/json'
],
);
$request->setBody($data); #set body!
$resp...
WebRTC - scalable live stream broadcasting / multicasting
...Janus. Now Janus decodes the data using its own key and have access to the raw data (that it, RTP packets) and can emit back those packets to each attendee (Janus takes care of encryption for you). And since you put Janus on a server, it has a great upload bandwidth, so you will be able to stream to...
Python str vs unicode types
... byte. Text can be encoded in a specific encoding to represent the text as raw bytes(e.g. utf-8, latin-1...).
Note that unicode is not encoded! The internal representation used by python is an implementation detail, and you shouldn't care about it as long as it is able to represent the code points ...
Quick way to list all files in Amazon S3 bucket?
... in addition, s3 encodes the filenames to be used as URLs, these are just raw filenames..
– Casey
Dec 23 '19 at 21:00
add a comment
|
...
Copy a file in a sane, safe and efficient way
...eate bare std::filebuf instances when no actual formatting is needed.
For raw performance, you can't beat POSIX file descriptors. It's ugly but portable and fast on any platform.
The Linux way appears to be incredibly fast — perhaps the OS let the function return before I/O was finished? In any ...
How to add custom method to Spring Data JPA
...ositoryImpl' has been injected into other beans [accountRepository] in its raw version as part of a circular reference, but has eventually been wrapped.
– Robert Hunt
Jul 1 '16 at 7:48
...