大约有 47,000 项符合查询结果（耗时：0.0840秒） [XML]
Using IQueryable with Linq
...Products table, and you want to get all of the products whose cost is >$25.
If you do:
IEnumerable<Product> products = myORM.GetProducts();
var productsOver25 = products.Where(p => p.Cost >= 25.00);
What happens here, is the database loads all of the products, and passes them ac...
how to check if List element contains an item with a Particular Property Value
...be more precise, I want to check if there exists pricePublicModel.Size == 200 ? Also, if this element exists, how to know which one it is?
...
How do I log ALL exceptions globally for a C# MVC4 WebAPI app?
... type HttpException which is obviously not the case with the Convert.ToInt32("a") code. So make sure that you log and handle all exceptions in there:
protected void Application_Error()
{
Exception unhandledException = Server.GetLastError();
HttpException httpException = unhandledException a...
How do I access this object property with an illegal name?
...
2 Answers
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How can I initialize an ArrayList with all zeroes in Java?
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432
The integer passed to the constructor represents its initial capacity, i.e., the number of eleme...
How to list records with date from the last 10 days?
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edited Sep 12 '18 at 12:36
IanS
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Rails find_or_create_by more than one attribute?
...er.where(:member_id => 4, :group_id => 7).first_or_initialize
Edit 2: Not all of these were factored out of rails just the attribute specific ones.
https://github.com/rails/rails/blob/4-2-stable/guides/source/active_record_querying.md
Example
GroupMember.find_or_create_by_member_id_and_...
Can I comment out a line in a .git/config file?
...
276
Yes, you can comment lines out of Git config files using # or ;.
From the documentation:
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How to compare two files not in repo using git
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218
git's diff is more functional than the standard unix diff. I often want to do this and since ...
Create unique constraint with null columns
..., menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible dra...