如何将以下LINQ查询更改为普通sql查询
本文关键字:查询 sql LINQ | 更新日期: 2023-09-27 18:05:21
我有一个查询,我需要这是一个普通的sql查询可以任何一个帮助我。此外,是否有其他方法可以不使用NorthWindDatacontext
,如所提到的代码,我的代码如下
private void FetchData(int take, int pageSize)
{
using (NorthwindDataContext dc = new NorthwindDataContext())
{
var query = from p in dc.Customers
.OrderBy(o => o.ContactName)
.Take(take)
.Skip(pageSize)
select new
{
ID = p.CustomerID,
Name = p.ContactName,
Count = dc.Customers.Count()
};
PagedDataSource page = new PagedDataSource();
page.AllowCustomPaging = true;
page.AllowPaging = true;
page.DataSource = query;
page.PageSize = 10;
Repeater1.DataSource = page;
Repeater1.DataBind();
if (!IsPostBack)
{
RowCount = query.First().Count;
CreatePagingControl();
}
}
}
我按照Jon
尝试过,但我无法得到所需的结果,任何人都可以帮助我
(SELECT [t1].[CustomerID] AS [ID], [t1].[ContactName] AS [Name], (
SELECT COUNT(*)
FROM [dbo].[Customers] AS [t2]
) AS [Count]
FROM (
SELECT TOP (10) [t0].[CustomerID], [t0].[ContactName]
FROM [dbo].[Customers] AS [t0]
ORDER BY [t0].[ContactName]
) AS [t1]
ORDER BY [t1].[ContactName]
在我看来,最简单的方法是看看LINQ to SQL正在做什么。
使用DataContext.Log
将查询信息写入某种日志(例如StringWriter
,其内容可以稍后打印出来)。它并不总是最干净的SQL,但在我看来,它是一个很好的起点。
我意识到这并不能回答你的特定的查询的问题,但它试图教你钓鱼,而不是给你一条鱼,因为它是:)
编辑:按照RoccoC5在注释中的建议使用LINQPad是查看LINQ查询生成的SQL的另一种好方法。
以下是LINQ查询生成的SQL,每个LINQPad,其中@p0
是要跳过的行数:
SELECT [t3].[CustomerID] AS [ID], [t3].[ContactName] AS [Name], (
SELECT COUNT(*)
FROM [Customers] AS [t4]
) AS [Count]
FROM (
SELECT [t2].[CustomerID], [t2].[ContactName], [t2].[ROW_NUMBER]
FROM (
SELECT ROW_NUMBER() OVER (ORDER BY [t1].[ContactName]) AS [ROW_NUMBER], [t1].[CustomerID], [t1].[ContactName]
FROM (
SELECT TOP (10) [t0].[CustomerID], [t0].[ContactName]
FROM [Customers] AS [t0]
ORDER BY [t0].[ContactName]
) AS [t1]
) AS [t2]
WHERE [t2].[ROW_NUMBER] > @p0
) AS [t3]
ORDER BY [t3].[ROW_NUMBER]