大约有 45,000 项符合查询结果（耗时：0.0294秒） [XML]
Unique Constraint in Entity Framework Code First
...d compliant you should absolutely be able to enforce uniqueness this way. Now whether EF allows you to properly manage the transaction lifecycle this way is another question.
– mattmc3
May 1 '11 at 0:21
...
How to tell Eclipse Workspace?
...It changed to that workspace which has never been closed. That is what is now displayed in that field.
– L. D. James
Dec 20 '15 at 14:42
1
...
Filter by property
...) if x.myProperty == [...]]
MyModel.objects.filter(id__in=objects_id)
I know it's not the most performatic solution, but may help in simple cases as mine
share
|
improve this answer
|
...
Caching a jquery ajax response in javascript/browser
...ve to bother with all the mess in the $.ajax() as I use $.ajaxPrefilter(). Now just setting {cache: true} is enough to handle the cache correctly :
var localCache = {
/**
* timeout for cache in millis
* @type {number}
*/
timeout: 30000,
/**
* @type {{_: number, data...
What is the difference between “text” and new String(“text”)?
...
If i write: String s = new String("abc"); And now i write: String s = "abc"; Will String s = "abc"; create a new String literal in the String pool?
– Kaveesh Kanwal
Apr 16 '15 at 18:34
...
Date vs DateTime
...ortion of the value.
public static void Main()
{
System.DateTime _Now = DateAndTime.Now;
Console.WriteLine("The Date and Time is " + _Now);
//will return the date and time
Console.WriteLine("The Date Only is " + _Now.Date);
//will return only the date
Console.Write("Pres...
Why declare unicode by string in python?
...nsparently by the interpreter; the most obvious difference is that you can now embed unicode characters in the string (that is, u'\u2665' is now legal). You can use from __future__ import unicode_literals to make it the default.
This only applies to Python 2; in Python 3 the default is Unicode, an...
Check if OneToOneField is None in Django
... doesn't work all the time. In case you want to work with select_related() now or in the future -- or maybe even to be sure you also handle other sorts of magic which may happen elsewhere -- you have to extend the test as follows: if hasattr(object, 'onetoonerevrelattr') and object.onetoonerevrelatt...
Best way to do multiple constructors in PHP
...l properties from array
}
}
?>
Then if i want a Student where i know the ID:
$student = Student::withID( $id );
Or if i have an array of the db row:
$student = Student::withRow( $row );
Technically you're not building multiple constructors, just static helper methods, but you get to ...
Access data in package subdirectory
...th modules that need to open data files in a ./data/ subdirectory. Right now I have the paths to the files hardcoded into my classes and functions. I would like to write more robust code that can access the subdirectory regardless of where it is installed on the user's system.
...