DTSUsageType 列舉
Indicates how an IDTSInputColumn100 object is used by a component.
命名空間： Microsoft.SqlServer.Dts.Pipeline.Wrapper
組件： Microsoft.SqlServer.DTSPipelineWrap (在 Microsoft.SqlServer.DTSPipelineWrap.dll 中)
語法
'宣告
Public Enumeration DTSUsageType
'用途
Dim instance As DTSUsageType
public enum DTSUsageType
public enum class DTSUsageType
type DTSUsageType
public enum DTSUsageType
成員
| 成員名稱 | 說明 | |
|---|---|---|
| UT_IGNORED | The column is ignored by the component. | |
| UT_READONLY | The component will read the values of an input column, but will not modify them. | |
| UT_READWRITE | The component will read and write to the column data. |
備註
This enumeration contains values that indicate how a component will use an IDTSInputColumn100 object.
Components validate that each column in their IDTSInputColumnCollection100 has its UsageType property set correctly.
For example, if a component needs read/write permission to an input column and the column's UsageType property is set to UT_READONLY, it should post a DTS_E_CANTSETUSAGETYPE message and return a failure result from Validate.