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What is the term "deferred query evaluation" in the context of LINQ referes to? (please give example).
Answer Snippets (Read the full thread at stackoverflow):
Or using other language constructs, such as the yield statement, to defer the execution until later.
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Hi,
I would like to know whether lazy loading == deferred execution ?
Thanks
Regards
Yong
Started by yong on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
"Lazy loading" is typically used to indicate that if you have an instance of an entity with a property that refers to some other entity, dereferencing the property in code will cause a database query to be issued to materialize that other entity, ... .
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I need to prioritize scripts so jQuery, Cufon, and my .js files come before Twitter does. I've tried defer="defer" as well as placing scripts in the bottom in the order I want them to execute but all these methods aren't working.
I don't want to modify...
Started by Brandon Wang on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Remember that defer.
And executed after your script, which comes after jQuery and Cufon .
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Ask your Facebook Friends
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Does anyone use deferred execution of JavaScript or is it something from the past? (I don't see it used on major websites). Also, what are the pros and cons of placing your javascript in the head tag vs placing it in the body?
Thanks
Started by Waleed Eissa on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Http://www.websiteoptimization.com/speed/tweak/defer/
For all those.
Even using "defer" doesn't really avoid it a little harder to code improperly.
Downloaded, if they are external files) before the DOM is rendered .
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How could I implement my own deferred execution mechanism in C#?
So for instance I have:
string x = DoFoo();
Is it possible to perform some magic so that DoFoo does not execute until I "use" x?
Started by Larsenal on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Why not just not call 'DoFoo()' until you want to?
-- Edit
I mean, what do you mean "use"
For example, if you want it to be called when '.ToString()' called, you can always inherit the class and implement your function there (but this would be quite unintuitive... .
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I recently read in Fowler's PofEA that some database engines allow you to defer RI checks until the end of the transaction. Is this possible in SQL Server?
The problem comes with some scenarios where I am trying to save changes that include insertions...
Started by Darrel Miller on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
May I humbly suggest that if it's tricky to determine the ... .
SQL Server does not have this feature.
This should be a one-time determination.
You would be better off determining the correct order so that the transaction can fail at the appropriate time .
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I have heard of deferred evaluation in python (for example here ), is it just referring to how lambdas are evaluated by the interpreter only when they are used? Or is this the proper term for describing how, due to python's dynamic design, it will not...
Started by C-o-r-E on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Here's a contrived example that shows part of the concept:
def list_files(): for fn in os.listdir(... .
In most languages, you use something like lambda to make this work .
Deferred evaluation is when an expression isn't evaluated until it is needed.
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I am using:
set constraints all deferred; (lots of deletes and inserts) commit;
This works as expected. If there are any broken relationships then the commit fails and an error is raised listing ONE of the FKs that it fails on.
The user fixes the offending...
Started by GHZ on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
You can find them there, fix them, re-insert the rows and delete them from the error table... .
That way you leave your constraints active, then do the inserts, with the erroring rows going into error tables .
First option, you can look into DML error logging.
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Hello All,
What this feature "http://apache.org/xml/features/dom/defer-node-expansion" does?
i have read about this feature . But was really unable to understand what will happen if this is set to false.
Can anyone come up elaborately on this as i don...
Started by Sri Kumar on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
By deferred node expansion, basically, a lot of objects/strings are not ....
For example Hibernate calls it Lazy Fetching.
This is a common design pattern, it is widely used .
It is a form lazy loading : DOM nodes are created as you traverse tree .
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Imagine I have the following:
private IEnumerable MyFunc(parameter a) { using(MyDataContext dc = new MyDataContext) { return dc.tablename.Select(row => row.parameter == a); } } private void UsingFunc() { var result = MyFunc(new a()); foreach(var row...
Started by Spence on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
You don't want the caller dealing with the data-context.
Don't want to defer execution (i.e.
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