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我试图通过在一次访问数据库时包含子属性来使我的Linq-to-SQL查询更高效。我开始尝试各种linq查询来完成此操作。这些查询都拿到复杂，所以我尝试了LoadWith（）选项：Linq-To-SQL对数据库的多次访问
我DAL类的构造函数设置LoadWith（）设置：
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;
}
这里是我使用的查询：
public TrackerJob GetItem(int trackerJobId)
{
TrackerJobRecord record =
(from trackerJob in this.Database.TrackerJobRecords
where trackerJob.TrackerJobId == trackerJobId
select trackerJob).FirstOrDefault();
return record.Map();
}
当我调试，并在刚刚LINQ查询（不返回）F10 ，我得到这个输出在SQL事件探查器：
请原谅我对SQL事件探查器的无知，但是三条突出显示的行意味着从客户端（我的代码）到服务器有三次往返？如果是这样，为什么？ SQL Server会在之间执行多个sp_executesql调用吗？一个之旅？
因为我认为LoadWith（）会消除多个调用，我做了什么不正确？
编辑
这里是SQL事件探查器中的三句话：
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
你介意张贴正在执行的三个查询？ – 2012-08-08 17:30:06
@JeffMercado完成。 – 2012-08-08 17:33:36
何时以及如何初始化this.Database？你在构造函数中设置它的属性，但我不明白它是如何设置的。 – 2012-08-08 17:57:27