Question

我有一个存储过程，我正在尝试将其转换为Linq到LLBLGen查询。 Linq to LLBGen中的查询有效，但是当我跟踪发送到sql server的查询时，它远非完美。

这是存储过程：

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

这是我的Linq to LLBLGen查询：

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>();

这是我要处理的初始表达式：

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()

现在这是发送到sql server的查询的样子：

选择查询：

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))))

参数：@ ProductCode1：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ ProductName2：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ Code3：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ Description4：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ DescriptionLong5：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ UnitCode6：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。

计数查询：

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]

参数：@ ProductCode1：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ ProductName2：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ Code3：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ Description4：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ DescriptionLong5：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。参数：@ UnitCode6：String。长度：2。精度：0。比例：0。方向：输入。值：“%%”。

正如您所看到的那样，没有进行排序或分页（就像在我的存储过程中一样）。这可能是在获取所有结果后在代码内部完成的。这会花费很多性能！有谁知道如何将我的存储过程转换为Linq到LLBLGen的正确方法？

Answer 1

您是否尝试使用TakePage（）而不是Skip / Take？文档说这是首选，我遇到了Skip / Take的一些奇怪问题。

我认为OrderBy子句在return语句中可能更好？我怀疑这是问题的根源。

所以也许试试：

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

Linq到LLBLGen查询问题

1 个答案: