大约有 45,000 项符合查询结果（耗时：0.0598秒） [XML]
Generating a UUID in Postgres for Insert statement?
...
|
edited Jan 27 '17 at 11:35
rightfold
29.2k88 gold badges8080 silver badges103103 bronze badges
...
JPA eager fetch does not join
...d mapped entity/collection of all root entities retrieved in first query = 2 queries
JOIN => one query to fetch both root entities and all of their mapped entity/collection = 1 query
So SELECT and JOIN are two extremes and SUBSELECT falls in between. One can choose suitable strategy based on he...
JavaScript % (modulo) gives a negative result for negative numbers
...
273
Number.prototype.mod = function(n) {
return ((this%n)+n)%n;
};
Taken from this article: ...
NSInvocation for Dummies?
...
284
According to Apple's NSInvocation class reference:
An NSInvocation is an Objective-C messa...
Using “like” wildcard in prepared statement
...
282
You need to set it in the value itself, not in the prepared statement SQL string.
So, this s...
How to export table as CSV with headings on Postgresql?
...
12 Answers
12
Active
...
Delete a key from a MongoDB document using Mongoose
...collection.update({_id: user._id}, {$unset: {field: 1 }});
Since version 2.0 you can do:
User.update({_id: user._id}, {$unset: {field: 1 }}, callback);
And since version 2.4, if you have an instance of a model already you can do:
doc.field = undefined;
doc.save(callback);
...
iOS: Compare two dates
...
210
According to Apple documentation of NSDate compare:
Returns an NSComparisonResult value th...
Is there a way to detach matplotlib plots so that the computation can continue?
...
221
Use matplotlib's calls that won't block:
Using draw():
from matplotlib.pyplot import plot, dra...
can we use xpath with BeautifulSoup?
...you can use the .xpath() method to search for elements.
try:
# Python 2
from urllib2 import urlopen
except ImportError:
from urllib.request import urlopen
from lxml import etree
url = "http://www.example.com/servlet/av/ResultTemplate=AVResult.html"
response = urlopen(url)
htmlparser =...