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SetUsageType 方法

Creates an IDTSInputColumn100 object in the IDTSInputColumnCollection100 of the component and sets the UsageType property of the column.

命名空间：  Microsoft.SqlServer.Dts.Pipeline.Wrapper
程序集：  Microsoft.SqlServer.DTSPipelineWrap（在 Microsoft.SqlServer.DTSPipelineWrap.dll 中）

语法

声明
Public Overridable Function SetUsageType ( _
    lInputID As Integer, _
    pIDTSVirtualInputObject As IDTSVirtualInput100, _
    lLineageID As Integer, _
    eUsageType As DTSUsageType _
) As IDTSInputColumn100
用法
Dim instance As CManagedComponentWrapperClass
Dim lInputID As Integer
Dim pIDTSVirtualInputObject As IDTSVirtualInput100
Dim lLineageID As Integer
Dim eUsageType As DTSUsageType
Dim returnValue As IDTSInputColumn100

returnValue = instance.SetUsageType(lInputID, _
    pIDTSVirtualInputObject, lLineageID, _
    eUsageType)

public virtual IDTSInputColumn100 SetUsageType(
    int lInputID,
    IDTSVirtualInput100 pIDTSVirtualInputObject,
    int lLineageID,
    DTSUsageType eUsageType
)

public:
virtual IDTSInputColumn100^ SetUsageType(
    [InAttribute] int lInputID, 
    [InAttribute] IDTSVirtualInput100^ pIDTSVirtualInputObject, 
    [InAttribute] int lLineageID, 
    [InAttribute] DTSUsageType eUsageType
)

abstract SetUsageType : 
        lInputID:int * 
        pIDTSVirtualInputObject:IDTSVirtualInput100 * 
        lLineageID:int * 
        eUsageType:DTSUsageType -> IDTSInputColumn100 
override SetUsageType : 
        lInputID:int * 
        pIDTSVirtualInputObject:IDTSVirtualInput100 * 
        lLineageID:int * 
        eUsageType:DTSUsageType -> IDTSInputColumn100 

public function SetUsageType(
    lInputID : int, 
    pIDTSVirtualInputObject : IDTSVirtualInput100, 
    lLineageID : int, 
    eUsageType : DTSUsageType
) : IDTSInputColumn100

参数

返回值

类型：Microsoft.SqlServer.Dts.Pipeline.Wrapper. . :: . .IDTSInputColumn100
The IDTSInputColumn100 whose usage type is set, or nullNothingnullptrunitnull 引用（在 Visual Basic 中为 Nothing） if the column was removed from the collection.

实现

IDTSDesigntimeComponent100. . :: . .SetUsageType(Int32, IDTSVirtualInput100, Int32, DTSUsageType)

注释

This method is used to select the columns from the upstream component in the data flow graph that are used by the component. Call this method to add or remove an IDTSInputColumn100 from the InputColumnCollection of the component. It also specifies whether the component has read-only access to the column or if it can overwrite the values of the column during execution.

If eusageType is UT_READONLY or UT_READWRITE, the component adds the column to its input column collection and provides the column to the data flow engine during execution. If UT_IGNORED is specified, and the column has previously been added to the collection, the column is removed.

示例

The following code example shows how SetUsageType is used to select the columns from the upstream component that are used by the component. The example assumes that the package has already been created or loaded, and that the data flow task and components have been added to the package.

IDTSComponentMetaData100 md = dataFlow.ComponentMetaDataCollection[1];
CManagedComponentWrapper wrp = md.Instantiate();
IDTSInput100 input = md.InputCollection[0];
IDTSVirtualInput100 vInput = input.GetVirtualInput();

foreach(IDTSVirtualInputColumn100 vCol in vInput.VirtualInputColumnCollection)
{
    wrp.SetUsageType(input.ID,vInput,vCol.LineageID,DTSUsageType.UT_READWRITE);
}