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我試圖通過在一次訪問數據庫時包含子屬性來使我的Linq-to-SQL查詢更高效。我開始嘗試各種linq查詢來完成此操作。這些查詢都拿到複雜，所以我嘗試了LoadWith（）選項：Linq-To-SQL對數據庫的多次訪問
我DAL類的構造函數設置LoadWith（）設置：
public TrackerJobData()
{
dataLoadOptions = new DataLoadOptions();
dataLoadOptions.LoadWith<TrackerJobRecord>(x => x.SpecBarcodeRecords);
dataLoadOptions.LoadWith<TrackerJobRecord>(x => x.TrackerJobEquipmentTriggerRecords);
dataLoadOptions.LoadWith<TrackerJobRecord>(x => x.EtaRecord);
this.Database.LoadOptions = dataLoadOptions;
}
這裏是我使用的查詢：
public TrackerJob GetItem(int trackerJobId)
{
TrackerJobRecord record =
(from trackerJob in this.Database.TrackerJobRecords
where trackerJob.TrackerJobId == trackerJobId
select trackerJob).FirstOrDefault();
return record.Map();
}
當我調試，並在剛剛LINQ查詢（不返回）F10 ，我得到這個輸出在SQL事件探查器：
請原諒我對SQL事件探查器的無知，但是三條突出顯示的行意味着從客戶端（我的代碼）到服務器有三次往返？如果是這樣，爲什麼？ SQL Server會在之間執行多個sp_executesql調用嗎？一個之旅？
因爲我認爲LoadWith（）會消除多個調用，我做了什麼不正確？
編輯
這裏是SQL事件探查器中的三句話：
exec sp_executesql N'SELECT TOP (1) [t0].[TrackerJobId], [t0].[Name], [t0].[EtaId], [t0].[SamplingProcessorTypeId], [t0].[Description], [t0].[LastModifiedUser], [t0].[LastModifiedTime], [t0].[VersionNumber], [t0].[Active], [t0].[Archived], [t1].[EtaId] AS [EtaId2], [t1].[EtaNumber], [t1].[Title], [t1].[State], [t1].[DateInitialized], [t1].[EtaOriginatorId], [t1].[Quantity], [t1].[Ehs], [t1].[Ship], [t1].[InternalUse], [t1].[DateClosed], [t1].[ExperimentId], [t1].[Disposition], [t1].[TestType], [t1].[LastModifiedUser] AS [LastModifiedUser2], [t1].[LastModifiedTime] AS [LastModifiedTime2], [t1].[VersionNumber] AS [VersionNumber2]
FROM [AutoTracker].[TrackerJob] AS [t0]
INNER JOIN [Global].[Eta] AS [t1] ON [t1].[EtaId] = [t0].[EtaId]
WHERE [t0].[TrackerJobId] = @p0',N'@p0 int',@p0=17
exec sp_executesql N'SELECT [t0].[SpecBarcodeId], [t0].[TrackerJobId], [t0].[EquipmentId], [t0].[StartTime], [t0].[EndTime], [t0].[LastModifiedUser], [t0].[LastModifiedTime], [t0].[VersionNumber]
FROM [AutoTracker].[SpecBarcode] AS [t0]
WHERE [t0].[TrackerJobId] = @x1',N'@x1 int',@x1=17
exec sp_executesql N'SELECT [t0].[TrackerJobId], [t0].[EquipmentId], [t0].[LastModifiedUser], [t0].[LastModifiedTime], [t0].[VersionNumber]
FROM [AutoTracker].[TrackerJobEquipmentTrigger] AS [t0]
WHERE [t0].[TrackerJobId] = @x1',N'@x1 int',@x1=17
你介意張貼正在執行的三個查詢？ – 2012-08-08 17:30:06
@JeffMercado完成。 – 2012-08-08 17:33:36
何時以及如何初始化this.Database？你在構造函數中設置它的屬性，但我不明白它是如何設置的。 – 2012-08-08 17:57:27