[英]How can i change the following LINQ query as normal sql query
我有一个查询,我需要将其作为普通的 sql 查询,任何人都可以帮助我。 还有没有使用NorthWindDatacontext
的任何替代方法,如代码中提到的我的代码如下
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
的说法尝试过,但我无法得到想要的结果,谁能帮助我
(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,最简单的方法是查看 LINQ 到 SQL 在做什么。
使用DataContext.Log
将查询信息写到某种类型的日志中(例如,写到StringWriter
中,您可以在之后打印出其内容)。 它并不总是最干净的 SQL,但它是 IMO 的一个很好的起点。
我意识到这并不能回答您特定查询的问题,但它试图教您钓鱼而不是给您一条鱼,因为它是:)
编辑:按照 RoccoC5 在评论中的建议使用LINQPad是查看为 LINQ 查询生成的 SQL 的另一种好方法。
这是每个 LINQPad 由 LINQ 查询生成的 SQL,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]
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