Linq到LLBLGen查詢問題

我有一個存儲過程，我試圖將它轉換爲Linq到LLBLGen查詢。在Linq中查詢LLBGen的工作原理，但是當我追蹤發送給sql server的查詢時，它並不完美。Linq到LLBLGen查詢問題

這是存儲過程：

ALTER PROCEDURE [dbo].[spDIGI_GetAllUmbracoProducts] 
-- Add the parameters for the stored procedure. 
@searchText nvarchar(255), 
@startRowIndex int, 
@maximumRows int, 
@sortExpression nvarchar(255) AS BEGIN 

SET @startRowIndex = @startRowIndex + 1 
SET @searchText = '%' + @searchText + '%' 

-- SET NOCOUNT ON added to prevent extra result sets from 
-- interfering with SELECT statements. 
SET NOCOUNT ON; 

-- This is the query which will fetch all the UmbracoProducts. 
-- This query also supports paging and sorting. 
WITH UmbracoOverview As 
(
    SELECT  ROW_NUMBER() OVER(
     ORDER BY 
     CASE 
      WHEN @sortExpression = 'productName' THEN umbracoProduct.productName 
      WHEN @sortExpression = 'productCode' THEN umbracoProduct.productCode    
     END ASC, 
     CASE 
      WHEN @sortExpression = 'productName DESC' THEN umbracoProduct.productName 
      WHEN @sortExpression = 'productCode DESC' THEN umbracoProduct.productCode   
     END DESC) 
     AS row_num, umbracoProduct.umbracoProductId, umbracoProduct.productName, umbracoProduct.productCode 
    FROM   umbracoProduct INNER JOIN 
        product ON umbracoProduct.umbracoProductId = product.umbracoProductId 
    WHERE  (umbracoProduct.productName LIKE @searchText 
    OR   umbracoProduct.productCode LIKE @searchText 
    OR   product.code LIKE @searchText 
    OR   product.description LIKE @searchText 
    OR   product.descriptionLong LIKE @searchText 
    OR   product.unitCode LIKE @searchText) 
) 

SELECT  UmbracoOverview.UmbracoProductId, UmbracoOverview.productName, UmbracoOverview.productCode 
FROM  UmbracoOverview 
WHERE  (row_num >= @startRowIndex 
AND   row_num < (@startRowIndex + @maximumRows)) 


-- This query will count all the UmbracoProducts. 
-- This query is used for paging inside ASP.NET. 
SELECT  COUNT (umbracoProduct.umbracoProductId) AS CountNumber 
FROM  umbracoProduct INNER JOIN 
       product ON umbracoProduct.umbracoProductId = product.umbracoProductId 
WHERE  (umbracoProduct.productName LIKE @searchText 
OR   umbracoProduct.productCode LIKE @searchText 
OR   product.code LIKE @searchText 
OR   product.description LIKE @searchText 
OR   product.descriptionLong LIKE @searchText 
OR   product.unitCode LIKE @searchText) END

這是我的LINQ到LLBLGEN查詢：

using System.Linq.Dynamic; 

     var q = (
        from up in MetaData.UmbracoProduct 
        join p in MetaData.Product on up.UmbracoProductId equals p.UmbracoProductId 
        where up.ProductCode.Contains(searchText) || 
         up.ProductName.Contains(searchText) || 
         p.Code.Contains(searchText) || 
         p.Description.Contains(searchText) || 
         p.DescriptionLong.Contains(searchText) || 
         p.UnitCode.Contains(searchText) 
        select new UmbracoProductOverview 
        { 
         UmbracoProductId = up.UmbracoProductId, 
         ProductName = up.ProductName, 
         ProductCode = up.ProductCode 
        } 
       ).OrderBy(sortExpression); 

//Save the count in HttpContext.Current.Items. This value will only be saved during 1 single HTTP request. 
HttpContext.Current.Items["AllProductsCount"] = q.Count(); 

//Returns the results paged. 
return q.Skip(startRowIndex).Take(maximumRows).ToList<UmbracoProductOverview>();

這是我最初的表達過程：

value(SD.LLBLGen.Pro.LinqSupportClasses.DataSource`1[Eurofysica.DB.EntityClasses.UmbracoProductEntity]).Join(value(SD.LLBLGen.Pro.LinqSupportClasses.DataSource`1[Eurofysica.DB.EntityClasses.ProductEntity]), up => up.UmbracoProductId, p => p.UmbracoProductId, (up, p) => new <>f__AnonymousType0`2(up = up, p = p)).Where(<>h__TransparentIdentifier0 => (((((<>h__TransparentIdentifier0.up.ProductCode.Contains(value(Eurofysica.BusinessLogic.BLL.Controllers.UmbracoProductController+<>c__DisplayClass1).searchText) || <>h__TransparentIdentifier0.up.ProductName.Contains(value(Eurofysica.BusinessLogic.BLL.Controllers.UmbracoProductController+<>c__DisplayClass1).searchText)) || <>h__TransparentIdentifier0.p.Code.Contains(value(Eurofysica.BusinessLogic.BLL.Controllers.UmbracoProductController+<>c__DisplayClass1).searchText)) || <>h__TransparentIdentifier0.p.Description.Contains(value(Eurofysica.BusinessLogic.BLL.Controllers.UmbracoProductController+<>c__DisplayClass1).searchText)) || <>h__TransparentIdentifier0.p.DescriptionLong.Contains(value(Eurofysica.BusinessLogic.BLL.Controllers.UmbracoProductController+<>c__DisplayClass1).searchText)) || <>h__TransparentIdentifier0.p.UnitCode.Contains(value(Eurofysica.BusinessLogic.BLL.Controllers.UmbracoProductController+<>c__DisplayClass1).searchText))).Select(<>h__TransparentIdentifier0 => new UmbracoProductOverview() {UmbracoProductId = <>h__TransparentIdentifier0.up.UmbracoProductId, ProductName = <>h__TransparentIdentifier0.up.ProductName, ProductCode = <>h__TransparentIdentifier0.up.ProductCode}).OrderBy(=> .ProductName).Count()

現在，這是查詢看起來如何發送到sql server：

Select查詢：

Query: SELECT [LPA_L2].[umbracoProductId] AS [UmbracoProductId], [LPA_L2].[productName] AS [ProductName], [LPA_L2].[productCode] AS [ProductCode] FROM ([eurofysica].[dbo].[umbracoProduct] [LPA_L2] INNER JOIN [eurofysica].[dbo].[product] [LPA_L3] ON [LPA_L2].[umbracoProductId] = [LPA_L3].[umbracoProductId]) WHERE (((((((([LPA_L2].[productCode] LIKE @ProductCode1) OR ([LPA_L2].[productName] LIKE @ProductName2)) OR ([LPA_L3].[code] LIKE @Code3)) OR ([LPA_L3].[description] LIKE @Description4)) OR ([LPA_L3].[descriptionLong] LIKE @DescriptionLong5)) OR ([LPA_L3].[unitCode] LIKE @UnitCode6))))

參數：@ ProductCode1：字符串。長度：2.精確度：0.比例：0.方向：輸入。值：「%%」。參數：@ ProductName2：字符串。長度：2.精確度：0.比例：0.方向：輸入。值：「%%」。參數：@ Code3：String。長度：2.精確度：0.比例：0.方向：輸入。值：「%%」。參數：@說明4：字符串。長度：2.精確度：0.比例：0.方向：輸入。值：「%%」。參數：@描述長5：字符串。長度：2.精確度：0.比例：0.方向：輸入。值：「%%」。參數：@ UnitCode6：String。長度：2.精確度：0.比例：0.方向：輸入。值：「%%」。

統計查詢：

Query: SELECT TOP 1 COUNT(*) AS [LPAV_] FROM (SELECT [LPA_L2].[umbracoProductId] AS [UmbracoProductId], [LPA_L2].[productName] AS [ProductName], [LPA_L2].[productCode] AS [ProductCode] FROM ([eurofysica].[dbo].[umbracoProduct] [LPA_L2] INNER JOIN [eurofysica].[dbo].[product] [LPA_L3] ON [LPA_L2].[umbracoProductId] = [LPA_L3].[umbracoProductId]) WHERE (((((((([LPA_L2].[productCode] LIKE @ProductCode1) OR ([LPA_L2].[productName] LIKE @ProductName2)) OR ([LPA_L3].[code] LIKE @Code3)) OR ([LPA_L3].[description] LIKE @Description4)) OR ([LPA_L3].[descriptionLong] LIKE @DescriptionLong5)) OR ([LPA_L3].[unitCode] LIKE @UnitCode6))))) [LPA_L1]

正如你可以看到沒有排序或分頁完成（就像在我的存儲過程中）。這可能在獲取所有結果後在代碼中完成。這花費了很多性能！有誰知道我可以如何將我的存儲過程轉換爲Linq到LLBLGen以正確的方式？

來源

2009-12-11 Jeroen Breuer

您是否嘗試過使用TakePage（）而不是Skip/Take？文檔說這是首選，我遇到了Skip/Take出現的一些奇怪的問題。

我認爲OrderBy子句在return語句中可能更好？不過，我懷疑這是問題的根源。

所以也許嘗試：

return q.OrderBy(sortExpression).TakePage(pageNumber, pageSize);

來源

2009-12-11 17:22:21

Linq到LLBLGen查詢問題

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