通过

IDTSBuffer90.IsNull Method

  • 项目

Checks whether a specified column is null.

命名空间: Microsoft.SqlServer.Dts.Pipeline.Wrapper
程序集: Microsoft.SqlServer.DTSPipelineWrap (in microsoft.sqlserver.dtspipelinewrap.dll)

语法

声明
Sub IsNull ( _
    <InAttribute> hRow As Integer, _
    <InAttribute> hCol As Integer, _
    <InAttribute> <OutAttribute> ByRef pfNull As Boolean _
)

void IsNull (
    [InAttribute] int hRow,
    [InAttribute] int hCol,
    [InAttribute] out bool pfNull
)

void IsNull (
    [InAttribute] int hRow, 
    [InAttribute] int hCol, 
    [InAttribute] [OutAttribute] bool% pfNull
)

void IsNull (
    /** @attribute InAttribute() */ int hRow, 
    /** @attribute InAttribute() */ int hCol, 
    /** @attribute InAttribute() */ /** @attribute OutAttribute() */ /** @ref */ boolean pfNull
)

JScript 不支持由引用传递值类型参数。

参数

  • hRow
    The handle of the row.
  • hCol
    The handle of the column.
  • pfNull
    An out parameter that indicates whether the column value is null.

备注

This method checks whether the data stored in the buffer column is null or empty. Managed data flow component developers do not call this method, but instead use the IsNull method of the managed PipelineBuffer class.

线程安全

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

平台

开发平台

有关支持的平台列表，请参阅安装 SQL Server 2005 的硬件和软件要求。

目标平台

有关支持的平台列表，请参阅安装 SQL Server 2005 的硬件和软件要求。

请参阅

参考

IDTSBuffer90 Interface
IDTSBuffer90 Members
Microsoft.SqlServer.Dts.Pipeline.Wrapper Namespace