Välja indatakolumner programmatiskt

Gäller för:SQL Server SSIS Integration Runtime i Azure Data Factory

När du har programmässigt anslutna komponenter, välj kolumnerna från uppströmskomponenter som du ska transformera eller skicka vidare till nedströmskomponenter. Om du inte väljer indatakolumner för din komponent får komponenten inga rader från dataflödesuppgiften.

Val av kolumner

Anropa GetVirtualInput metoden för att hämta listan över tillgängliga kolumner från en uppströmskomponent, och anropa SetUsageType sedan metoden för designtidskomponentinstansen för att välja kolumner från den virtuella indatakolumnsamlingen. När du anropar denna metod skapar komponenten en ny indatakolumn i sin indatakolumnsamling som har samma linje-ID som motsvarande kolumn i utdatasamlingen för den uppströms komponenten.

Välj inte kolumner genom att direkt anropa SetUsageType metoden för det virtuella indataobjektet, eftersom detta kringgår komponentens förmåga att avvisa kolumner baserat på olämpliga datatyper eller andra egenskaper.

Sample

Följande kodexempel visar hur man använder designtidsinstansen för en komponent för att välja kolumner för en komponent.

using System;  
using Microsoft.SqlServer.Dts.Runtime;  
using Microsoft.SqlServer.Dts.Pipeline;  
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;  
  
namespace Microsoft.SqlServer.Dts.Samples  
{  
  class Program  
  {  
    static void Main(string[] args)  
    {  
      // Create a package and add a Data Flow task.  
      Package package = new Package();  
      Executable e = package.Executables.Add("STOCK:PipelineTask");  
      TaskHost thMainPipe = e as TaskHost;  
      MainPipe dataFlowTask = thMainPipe.InnerObject as MainPipe;  
  
      // Add an OLE DB connection manager to the package.  
      ConnectionManager conMgr = package.Connections.Add("OLEDB");  
      conMgr.ConnectionString = "Provider=SQLOLEDB.1;" +  
        "Data Source=<servername>;Initial Catalog=AdventureWorks;" +  
        "Integrated Security=SSPI;";  
      conMgr.Name = "SSIS Connection Manager for OLE DB";  
      conMgr.Description = "OLE DB connection to the AdventureWorks database.";  
  
      // Create and configure an OLE DB source component.    
      IDTSComponentMetaData100 source =  
        dataFlowTask.ComponentMetaDataCollection.New();  
      source.ComponentClassID = "DTSAdapter.OleDbSource";  
      // Create the design-time instance of the source.  
      CManagedComponentWrapper srcDesignTime = source.Instantiate();  
      // The ProvideComponentProperties method creates a default output.  
      srcDesignTime.ProvideComponentProperties();  
      // Assign the connection manager.  
      source.RuntimeConnectionCollection[0].ConnectionManager =  
        DtsConvert.GetExtendedInterface(conMgr);  
      // Set the custom properties of the source.  
      srcDesignTime.SetComponentProperty("AccessMode", 2);  
      srcDesignTime.SetComponentProperty("SqlCommand",  
        "Select * from Production.Product");  
  
      // Connect to the data source,  
      //  and then update the metadata for the source.  
      srcDesignTime.AcquireConnections(null);  
      srcDesignTime.ReinitializeMetaData();  
      srcDesignTime.ReleaseConnections();  
  
      // Create and configure an OLE DB destination.  
      IDTSComponentMetaData100 destination =  
        dataFlowTask.ComponentMetaDataCollection.New();  
      destination.ComponentClassID = "DTSAdapter.OleDbDestination";  
      // Create the design-time instance of the destination.  
      CManagedComponentWrapper destDesignTime = destination.Instantiate();  
      // The ProvideComponentProperties method creates a default input.  
      destDesignTime.ProvideComponentProperties();  
  
      // Create the path from source to destination.  
      IDTSPath100 path = dataFlowTask.PathCollection.New();  
      path.AttachPathAndPropagateNotifications(source.OutputCollection[0],  
        destination.InputCollection[0]);  
  
      // Get the destination's default input and virtual input.  
      IDTSInput100 input = destination.InputCollection[0];  
      IDTSVirtualInput100 vInput = input.GetVirtualInput();  
  
      // Iterate through the virtual input column collection.  
      foreach (IDTSVirtualInputColumn100 vColumn in vInput.VirtualInputColumnCollection)  
      {  
        // Call the SetUsageType method of the destination  
        //  to add each available virtual input column as an input column.  
        destDesignTime.SetUsageType(  
           input.ID, vInput, vColumn.LineageID, DTSUsageType.UT_READONLY);  
      }  
  
      // Verify that the columns have been added to the input.  
      foreach (IDTSInputColumn100 inputColumn in destination.InputCollection[0].InputColumnCollection)  
        Console.WriteLine(inputColumn.Name);  
      Console.Read();  
  
      // Add other components to the data flow and connect them.  
    }  
  }  
}  

Imports Microsoft.SqlServer.Dts.Runtime  
Imports Microsoft.SqlServer.Dts.Pipeline  
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper  
  
Module Module1  
  
  Sub Main()  
  
    ' Create a package and add a Data Flow task.  
    Dim package As Microsoft.SqlServer.Dts.Runtime.Package = _  
      New Microsoft.SqlServer.Dts.Runtime.Package()  
    Dim e As Executable = package.Executables.Add("STOCK:PipelineTask")  
    Dim thMainPipe As Microsoft.SqlServer.Dts.Runtime.TaskHost = _  
      CType(e, Microsoft.SqlServer.Dts.Runtime.TaskHost)  
    Dim dataFlowTask As MainPipe = CType(thMainPipe.InnerObject, MainPipe)  
  
    ' Add an OLE DB connection manager to the package.  
    Dim conMgr As ConnectionManager = package.Connections.Add("OLEDB")  
    conMgr.ConnectionString = "Provider=SQLOLEDB.1;" & _  
      "Data Source=<servername>;Initial Catalog=AdventureWorks;" & _  
      "Integrated Security=SSPI;"  
    conMgr.Name = "SSIS Connection Manager for OLE DB"  
    conMgr.Description = "OLE DB connection to the AdventureWorks database."  
  
    ' Create and configure an OLE DB source component.    
    Dim source As IDTSComponentMetaData100 = _  
      dataFlowTask.ComponentMetaDataCollection.New  
    source.ComponentClassID = "DTSAdapter.OleDbSource"  
    ' Create the design-time instance of the source.  
    Dim srcDesignTime As CManagedComponentWrapper = source.Instantiate  
    ' The ProvideComponentProperties method creates a default output.  
    srcDesignTime.ProvideComponentProperties()  
    ' Assign the connection manager.  
    source.RuntimeConnectionCollection(0).ConnectionManager = _  
      DtsConvert.GetExtendedInterface(conMgr)  
    ' Set the custom properties of the source.  
    srcDesignTime.SetComponentProperty("AccessMode", 2)  
    srcDesignTime.SetComponentProperty("SqlCommand", _  
      "Select * from Production.Product")  
  
    ' Connect to the data source,  
    '  and then update the metadata for the source.  
    srcDesignTime.AcquireConnections(Nothing)  
    srcDesignTime.ReinitializeMetaData()  
    srcDesignTime.ReleaseConnections()  
  
    ' Create and configure an OLE DB destination.  
    Dim destination As IDTSComponentMetaData100 = _  
      dataFlowTask.ComponentMetaDataCollection.New  
    destination.ComponentClassID = "DTSAdapter.OleDbDestination"  
    ' Create the design-time instance of the destination.  
    Dim destDesignTime As CManagedComponentWrapper = destination.Instantiate  
    ' The ProvideComponentProperties method creates a default input.  
    destDesignTime.ProvideComponentProperties()  
  
    ' Create the path from source to destination.  
    Dim path As IDTSPath100 = dataFlowTask.PathCollection.New  
    path.AttachPathAndPropagateNotifications(source.OutputCollection(0), _  
      destination.InputCollection(0))  
  
    ' Get the destination's default input and virtual input.  
    Dim input As IDTSInput100 = destination.InputCollection(0)  
    Dim vInput As IDTSVirtualInput100 = input.GetVirtualInput  
  
    ' Iterate through the virtual input column collection.  
    For Each vColumn As IDTSVirtualInputColumn100 In vInput.VirtualInputColumnCollection  
      ' Call the SetUsageType method of the destination  
      '  to add each available virtual input column as an input column.  
      destDesignTime.SetUsageType(input.ID, vInput, vColumn.LineageID, DTSUsageType.UT_READONLY)  
    Next  
  
    ' Verify that the columns have been added to the input.  
    For Each inputColumn As IDTSInputColumn100 In destination.InputCollection(0).InputColumnCollection  
      Console.WriteLine(inputColumn.Name)  
    Next  
    Console.Read()  
  
    ' Add other components to the data flow and connect them.  
  
  End Sub  
  
End Module

Relaterat innehåll

  • Last updated on