大约有 40,000 项符合查询结果（耗时：0.0639秒） [XML]
ActiveRecord: size vs count
... don't know what you are doing, use size...
count
Resolves to sending a Select count(*)... query to the DB. The way to go if you don't need the data, but just the count.
Example: count of new messages, total elements when only a page is going to be displayed, etc.
length
Loads the required dat...
Group By Multiple Columns
... new {t.MaterialID, t.ProductID}
into grp
select new
{
grp.Key.MaterialID,
grp.Key.ProductID,
Quantity = grp.Sum(t => t.Quantity)
}).ToList();
...
How to check if an object is a certain type
... Is there a performance difference between the two? - What about Select Case (Obj.GetType()) with multiple test cases Vs multiple IF TypeOf Obj is ...?
– Luke T O'Brien
May 22 '17 at 16:27
...
Performing Inserts and Updates with Dapper
...anager.ConnectionStrings["myDbConnection"].ConnectionString))
{
string selectQuery = @"SELECT * FROM [dbo].[Customer] WHERE FirstName = @FirstName";
var result = db.Query(selectQuery, new
{
customerModel.FirstName
});
}
Code for CRUD:
using (IDbConnection db = new SqlConn...
How to determine programmatically whether a particular process is 32-bit or 64-bit
...
The selected answer is incorrect as it doesn't do what was asked. It checks if a process is a x86 process running on x64 OS instead; so it will return "false" for a x64 process on x64 OS or x86 process running on x86 OS.
Also, it...
Google Gson - deserialize list object? (generic type)
... generics? T[] yourClassList = gson.fromJson(message, T[].class); //cannot select from type variable
– Pawel Cioch
Feb 21 '15 at 17:31
...
How to change the name of a Django app?
...ete the permissions: delete from auth_permission where content_type_id in (select id from django_content_type where app_label = '<OldAppName>')
Delete content types: delete from django_content_type where app_label = '<OldAppName>'
Rename the folder of the app.
Change any references to y...
How to make a div fill a remaining horizontal space?
...
This should be accepted as the selected solution for current times. Also, it is the only "non-hackish" solution.
– Greg
Nov 20 '18 at 19:31
...
Button Click event fires when pressing Enter key in different input (no forms)
... must override IE's default behavior with preventDefault(). In your jQuery selector, put in the div that contains the text boxes you want to ignore the enter key -- in your case, the "page" div. Instead of selecting the whole div, you could also specify the text boxes you want to ignore specifically...
Font size of TextView in Android application changes on changing font size from native settings
...
issue is not screens. It is the native font size selected in android display settings which leads to the issue mentioned
– Himanshu Virmani
Jun 21 '13 at 9:36
...