DTSUsageType 枚举
Indicates how an IDTSInputColumn100 object is used by a component.
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 Enumeration DTSUsageType
用法
Dim instance As DTSUsageType
public enum DTSUsageType
public enum class DTSUsageType
type DTSUsageType
public enum DTSUsageType
成员
| 成员名称 | 说明 | |
|---|---|---|
| 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. |
注释
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.