使用 EF 和存储过程进行延迟加载
[英]LazyLoading with EF and stored procedures
问题描述
我的 EF 需要很长时间才能执行，当使用 SQL Server Profiler 时，我可以看到它将我的查询分成小部分，这些小部分都是加起来的。
我决定创建一个存储过程来减少加载时间。 它看起来像这样：
CREATE PROCEDURE GetAllProducts
AS
BEGIN
SET NOCOUNT ON;
SELECT
a.*,
b.*,
b1.*,
c.*,
preview.*,
e.*,
a1.*,
a2.*,
a3.*,
a4.*,
a5.*,
a6.*,
a7.*,
a8.*,
a9.*,
a10.*,
a11.*,
a12.*,
a13.*
FROM
Products AS a
INNER JOIN
Details AS b ON a.DetailId = b.Id
INNER JOIN
Categories AS c ON a.CategoryId = c.Id
INNER JOIN
Previews AS preview ON a.PreviewId = preview.Id
INNER JOIN
CameraAttributes AS e ON a.AttributeId = e.Id
INNER JOIN
CameraAttributePicture AS a1 ON e.Id = a1.AttributeId
INNER JOIN
CameraAttributeVideo AS a2 ON e.Id = a2.AttributeId
INNER JOIN
CameraAttributeAudio AS a3 ON e.Id = a3.AttributeId
INNER JOIN
CameraAttributeBattery AS a4 ON e.Id = a4.AttributeId
INNER JOIN
CameraAttributeDimensions AS a5 ON e.Id = a5.AttributeId
INNER JOIN
CameraAttributeDisplay AS a6 ON e.Id = a6.AttributeId
INNER JOIN
CameraAttributeLightExposure AS a7 ON e.Id = a7.AttributeId
INNER JOIN
CameraAttributeFlash as a8 ON e.Id = a8.AttributeId
INNER JOIN
CameraAttributeFocusing AS a9 ON e.Id = a9.AttributeId
INNER JOIN
CameraAttributeInterface AS a10 ON e.Id = a10.AttributeId
INNER JOIN
CameraAttributeLens AS a11 ON e.Id = a11.AttributeId
INNER JOIN
CameraAttributeLensZoom AS b1 ON a11.id = b1.LensId
INNER JOIN
CameraAttributeNetwork AS a12 ON e.Id = a12.AttributeId
INNER JOIN
CameraAttributeShutter AS a13 ON e.Id = a13.AttributeId
END
GO
我已加入查询中的所有表，希望它们与我的应用程序中的模型相匹配：
public class Product
{
public int Id { get; set; }
[MaxLength(255)] public string GTIN { get; set; }
[Required] [MaxLength(100)] public string ProductId { get; set; }
[Required] [MaxLength(100)] public string Make { get; set; }
[MaxLength(100)] public string Model { get; set; }
public bool Expert { get; set; }
public bool Sponsored { get; set; }
public virtual CameraAttribute Attributes { get; set; }
public virtual Detail Details { get; set; }
public virtual Category Category { get; set; }
public virtual Preview Preview { get; set; }
}
问题是，所有的虚拟属性都是空的。
我假设在使用存储过程时我不能延迟加载它们，那么我怎样才能填充属性呢？
我无法全部发布，因为它会使浏览器崩溃，但这里有一个片段。 我希望这有帮助：
Opened connection asynchronously at 19/04/2016 12:31:57 +01:00
'iisexpress.exe' (CLR v4.0.30319: /LM/W3SVC/2/ROOT-38-131055390555737826): Loaded 'EntityFrameworkDynamicProxies-Piiick.Web'.
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[GTIN] AS [GTIN],
[Extent1].[ProductId] AS [ProductId],
[Extent1].[Make] AS [Make],
[Extent1].[Model] AS [Model],
[Extent1].[Expert] AS [Expert],
[Extent1].[Sponsored] AS [Sponsored],
[Extent1].[AttributeId] AS [AttributeId],
[Extent1].[CategoryId] AS [CategoryId],
[Extent1].[DetailId] AS [DetailId],
[Extent1].[PreviewId] AS [PreviewId]
FROM [dbo].[Products] AS [Extent1]
-- Executing asynchronously at 19/04/2016 12:31:57 +01:00
-- Completed in 7 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:31:57 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Join13].[Id1] AS [Id],
[Join13].[CompatibleMemory] AS [CompatibleMemory],
[Join13].[WhiteBalance] AS [WhiteBalance],
[Join13].[SceneModes] AS [SceneModes],
[Join13].[ShootingModes] AS [ShootingModes],
[Join13].[PhotoEffects] AS [PhotoEffects],
[Join13].[CameraPlayback] AS [CameraPlayback],
[Join13].[Tripod] AS [Tripod],
[Join13].[DirectPrinting] AS [DirectPrinting],
[Join13].[Colour] AS [Colour],
[Join13].[Id2] AS [Id1],
[Join13].[Id3] AS [Id2],
[Join13].[Id4] AS [Id3],
[Join13].[Id5] AS [Id4],
[Join13].[Id6] AS [Id5],
[Join13].[Id7] AS [Id6],
[Join13].[Id8] AS [Id7],
[Join13].[Id9] AS [Id8],
[Join13].[Id10] AS [Id9],
[Join13].[Id11] AS [Id10],
[Join13].[Id12] AS [Id11],
[Join13].[Id13] AS [Id12],
[Join13].[Id14] AS [Id13]
FROM [dbo].[Products] AS [Extent1]
INNER JOIN (SELECT [Extent2].[Id] AS [Id1], [Extent2].[CompatibleMemory] AS [CompatibleMemory], [Extent2].[WhiteBalance] AS [WhiteBalance], [Extent2].[SceneModes] AS [SceneModes], [Extent2].[ShootingModes] AS [ShootingModes], [Extent2].[PhotoEffects] AS [PhotoEffects], [Extent2].[CameraPlayback] AS [CameraPlayback], [Extent2].[Tripod] AS [Tripod], [Extent2].[DirectPrinting] AS [DirectPrinting], [Extent2].[Colour] AS [Colour], [Extent3].[Id] AS [Id2], [Extent4].[Id] AS [Id3], [Extent5].[Id] AS [Id4], [Extent6].[Id] AS [Id5], [Extent7].[Id] AS [Id6], [Extent8].[Id] AS [Id7], [Extent9].[Id] AS [Id8], [Extent10].[Id] AS [Id9], [Extent11].[Id] AS [Id10], [Extent12].[Id] AS [Id11], [Extent13].[Id] AS [Id12], [Extent14].[Id] AS [Id13], [Extent15].[Id] AS [Id14]
FROM [dbo].[CameraAttributes] AS [Extent2]
LEFT OUTER JOIN [dbo].[CameraAttributeAudio] AS [Extent3] ON [Extent2].[Id] = [Extent3].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeBattery] AS [Extent4] ON [Extent2].[Id] = [Extent4].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeDimensions] AS [Extent5] ON [Extent2].[Id] = [Extent5].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeDisplay] AS [Extent6] ON [Extent2].[Id] = [Extent6].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeLightExposure] AS [Extent7] ON [Extent2].[Id] = [Extent7].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeFlash] AS [Extent8] ON [Extent2].[Id] = [Extent8].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeFocusing] AS [Extent9] ON [Extent2].[Id] = [Extent9].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeInterface] AS [Extent10] ON [Extent2].[Id] = [Extent10].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeLens] AS [Extent11] ON [Extent2].[Id] = [Extent11].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeNetwork] AS [Extent12] ON [Extent2].[Id] = [Extent12].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributePicture] AS [Extent13] ON [Extent2].[Id] = [Extent13].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeShutter] AS [Extent14] ON [Extent2].[Id] = [Extent14].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeVideo] AS [Extent15] ON [Extent2].[Id] = [Extent15].[AttributeId] ) AS [Join13] ON [Extent1].[AttributeId] = [Join13].[Id1]
WHERE [Extent1].[Id] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 11 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[SupportedFormats] AS [SupportedFormats],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeAudio] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[PowerSource] AS [PowerSource],
[Extent1].[Technology] AS [Technology],
[Extent1].[Life] AS [Life],
[Extent1].[Type] AS [Type],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeBattery] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 6 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Width] AS [Width],
[Extent1].[Depth] AS [Depth],
[Extent1].[Height] AS [Height],
[Extent1].[Weight] AS [Weight],
[Extent1].[WeightIncludingBattery] AS [WeightIncludingBattery],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeDimensions] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 3 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Type] AS [Type],
[Extent1].[Diagonal] AS [Diagonal],
[Extent1].[Resolution] AS [Resolution],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeDisplay] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[IsoSensitivity] AS [IsoSensitivity],
[Extent1].[Mode] AS [Mode],
[Extent1].[Correction] AS [Correction],
[Extent1].[Metering] AS [Metering],
[Extent1].[Minimum] AS [Minimum],
[Extent1].[Maxiumum] AS [Maxiumum],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeLightExposure] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Modes] AS [Modes],
[Extent1].[ExposureLock] AS [ExposureLock],
[Extent1].[RangeWide] AS [RangeWide],
[Extent1].[RangeTelephoto] AS [RangeTelephoto],
[Extent1].[RechargeTime] AS [RechargeTime],
[Extent1].[Speed] AS [Speed],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeFlash] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 2 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Focus] AS [Focus],
[Extent1].[Adjustment] AS [Adjustment],
[Extent1].[AutoFocusModes] AS [AutoFocusModes],
[Extent1].[ClosestDistance] AS [ClosestDistance],
[Extent1].[NormalRange] AS [NormalRange],
[Extent1].[MacroRangeTelephoto] AS [MacroRangeTelephoto],
[Extent1].[MacroRangeWide] AS [MacroRangeWide],
[Extent1].[AutoModeTelephoto] AS [AutoModeTelephoto],
[Extent1].[AutoModeWide] AS [AutoModeWide],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeFocusing] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[PictBridge] AS [PictBridge],
[Extent1].[USBVersion] AS [USBVersion],
[Extent1].[USBType] AS [USBType],
[Extent1].[HDMI] AS [HDMI],
[Extent1].[HDMIType] AS [HDMIType],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeInterface] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Join1].[Id1] AS [Id],
[Join1].[FocalLength] AS [FocalLength],
[Join1].[MinimumFocalLength] AS [MinimumFocalLength],
[Join1].[MaximumFocalLength] AS [MaximumFocalLength],
[Join1].[MinimumAperture] AS [MinimumAperture],
[Join1].[MaximumAperture] AS [MaximumAperture],
[Join1].[LensStructure] AS [LensStructure],
[Join1].[Id2] AS [Id1],
[Join1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeLens] AS [Extent1]
INNER JOIN (SELECT [Extent2].[Id] AS [Id1], [Extent2].[FocalLength] AS [FocalLength], [Extent2].[MinimumFocalLength] AS [MinimumFocalLength], [Extent2].[MaximumFocalLength] AS [MaximumFocalLength], [Extent2].[MinimumAperture] AS [MinimumAperture], [Extent2].[MaximumAperture] AS [MaximumAperture], [Extent2].[LensStructure] AS [LensStructure], [Extent2].[AttributeId] AS [AttributeId], [Extent3].[Id] AS [Id2]
FROM [dbo].[CameraAttributeLens] AS [Extent2]
LEFT OUTER JOIN [dbo].[CameraAttributeLensZoom] AS [Extent3] ON [Extent2].[Id] = [Extent3].[LensId] ) AS [Join1] ON [Extent1].[Id] = [Join1].[Id1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 2 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Optical] AS [Optical],
[Extent1].[Digital] AS [Digital],
[Extent1].[ExtraSmart] AS [ExtraSmart],
[Extent1].[Combined] AS [Combined],
[Extent1].[LensId] AS [LensId]
FROM [dbo].[CameraAttributeLensZoom] AS [Extent1]
WHERE [Extent1].[LensId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[WiFi] AS [WiFi],
[Extent1].[WiFiStandards] AS [WiFiStandards],
[Extent1].[NFC] AS [NFC],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeNetwork] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 2 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Megapixel] AS [Megapixel],
[Extent1].[Type] AS [Type],
[Extent1].[SensorType] AS [SensorType],
[Extent1].[MaxResolution] AS [MaxResolution],
[Extent1].[Resolutions] AS [Resolutions],
[Extent1].[Stablizer] AS [Stablizer],
[Extent1].[Location] AS [Location],
[Extent1].[SupportedAspectRatios] AS [SupportedAspectRatios],
[Extent1].[TotalMegapixels] AS [TotalMegapixels],
[Extent1].[Formats] AS [Formats],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributePicture] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 2 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[FastestSpeed] AS [FastestSpeed],
[Extent1].[SlowestSpeed] AS [SlowestSpeed],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeShutter] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[MaxResolution] AS [MaxResolution],
[Extent1].[Resolutions] AS [Resolutions],
[Extent1].[CaptureResolution] AS [CaptureResolution],
[Extent1].[FrameRate] AS [FrameRate],
[Extent1].[FullHD] AS [FullHD],
[Extent1].[SupportedFormats] AS [SupportedFormats],
[Extent1].[AttributeId] AS [AttributeId]
FROM [dbo].[CameraAttributeVideo] AS [Extent1]
WHERE [Extent1].[AttributeId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent2].[Id] AS [Id],
[Extent2].[Name] AS [Name]
FROM [dbo].[Products] AS [Extent1]
INNER JOIN [dbo].[Categories] AS [Extent2] ON [Extent1].[CategoryId] = [Extent2].[Id]
WHERE [Extent1].[Id] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Extent2].[Id] AS [Id],
[Extent2].[Title] AS [Title],
[Extent2].[Description] AS [Description],
[Extent2].[ShortDescription] AS [ShortDescription],
[Extent2].[Summary] AS [Summary],
[Extent2].[ShortSummary] AS [ShortSummary]
FROM [dbo].[Products] AS [Extent1]
INNER JOIN [dbo].[Details] AS [Extent2] ON [Extent1].[DetailId] = [Extent2].[Id]
WHERE [Extent1].[Id] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 1 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
Opened connection at 19/04/2016 12:32:01 +01:00
SELECT
[Join13].[Id1] AS [Id],
[Join13].[CompatibleMemory] AS [CompatibleMemory],
[Join13].[WhiteBalance] AS [WhiteBalance],
[Join13].[SceneModes] AS [SceneModes],
[Join13].[ShootingModes] AS [ShootingModes],
[Join13].[PhotoEffects] AS [PhotoEffects],
[Join13].[CameraPlayback] AS [CameraPlayback],
[Join13].[Tripod] AS [Tripod],
[Join13].[DirectPrinting] AS [DirectPrinting],
[Join13].[Colour] AS [Colour],
[Join13].[Id2] AS [Id1],
[Join13].[Id3] AS [Id2],
[Join13].[Id4] AS [Id3],
[Join13].[Id5] AS [Id4],
[Join13].[Id6] AS [Id5],
[Join13].[Id7] AS [Id6],
[Join13].[Id8] AS [Id7],
[Join13].[Id9] AS [Id8],
[Join13].[Id10] AS [Id9],
[Join13].[Id11] AS [Id10],
[Join13].[Id12] AS [Id11],
[Join13].[Id13] AS [Id12],
[Join13].[Id14] AS [Id13]
FROM [dbo].[Products] AS [Extent1]
INNER JOIN (SELECT [Extent2].[Id] AS [Id1], [Extent2].[CompatibleMemory] AS [CompatibleMemory], [Extent2].[WhiteBalance] AS [WhiteBalance], [Extent2].[SceneModes] AS [SceneModes], [Extent2].[ShootingModes] AS [ShootingModes], [Extent2].[PhotoEffects] AS [PhotoEffects], [Extent2].[CameraPlayback] AS [CameraPlayback], [Extent2].[Tripod] AS [Tripod], [Extent2].[DirectPrinting] AS [DirectPrinting], [Extent2].[Colour] AS [Colour], [Extent3].[Id] AS [Id2], [Extent4].[Id] AS [Id3], [Extent5].[Id] AS [Id4], [Extent6].[Id] AS [Id5], [Extent7].[Id] AS [Id6], [Extent8].[Id] AS [Id7], [Extent9].[Id] AS [Id8], [Extent10].[Id] AS [Id9], [Extent11].[Id] AS [Id10], [Extent12].[Id] AS [Id11], [Extent13].[Id] AS [Id12], [Extent14].[Id] AS [Id13], [Extent15].[Id] AS [Id14]
FROM [dbo].[CameraAttributes] AS [Extent2]
LEFT OUTER JOIN [dbo].[CameraAttributeAudio] AS [Extent3] ON [Extent2].[Id] = [Extent3].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeBattery] AS [Extent4] ON [Extent2].[Id] = [Extent4].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeDimensions] AS [Extent5] ON [Extent2].[Id] = [Extent5].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeDisplay] AS [Extent6] ON [Extent2].[Id] = [Extent6].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeLightExposure] AS [Extent7] ON [Extent2].[Id] = [Extent7].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeFlash] AS [Extent8] ON [Extent2].[Id] = [Extent8].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeFocusing] AS [Extent9] ON [Extent2].[Id] = [Extent9].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeInterface] AS [Extent10] ON [Extent2].[Id] = [Extent10].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeLens] AS [Extent11] ON [Extent2].[Id] = [Extent11].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeNetwork] AS [Extent12] ON [Extent2].[Id] = [Extent12].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributePicture] AS [Extent13] ON [Extent2].[Id] = [Extent13].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeShutter] AS [Extent14] ON [Extent2].[Id] = [Extent14].[AttributeId]
LEFT OUTER JOIN [dbo].[CameraAttributeVideo] AS [Extent15] ON [Extent2].[Id] = [Extent15].[AttributeId] ) AS [Join13] ON [Extent1].[AttributeId] = [Join13].[Id1]
WHERE [Extent1].[Id] = @EntityKeyValue1
-- EntityKeyValue1: '2' (Type = Int32, IsNullable = false)
-- Executing at 19/04/2016 12:32:01 +01:00
-- Completed in 0 ms with result: SqlDataReader
Closed connection at 19/04/2016 12:32:01 +01:00
1 个解决方案
解决方案1
1 已采纳 2016-04-19 11:00:59
您可以使用Include<T>在 EF 中快速加载加入的实体
像这样：
using (var context = new BloggingContext())
{
// Load all blogs and related posts
var blogs1 = context.Product
.Include(p => p.Category )
//more included properties
.Where(....) //filtering
.ToList(); //ToList() eagerly loads the Included entites
}
EF 5，存储过程和脚手架
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