GetColumnSQLVARIANTDataType Method

后续版本的 Microsoft SQL Server 将删除该功能。请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。

The GetColumnSQLVARIANTDataType method retrieves the underlying data type of the specified sql_variant column.

语法

object
.GetColumnSQLVARIANTDataType( 
Row
, 
Column
, 
ObjName
)
as String

Parts

• object
  Expression that evaluates to an object in the Applies To list.

• Row
  Long integer that identifies a row by ordinal position.

• Column
  Long integer that identifies a column by ordinal position.

• ObjName
  String that specifies a table or view name.

Prototype (C/C++)

HRESULT GetColumnSQLVARIANTDataType(
long lRow, 
long lColumn, 
SQLDMO_LPCSTR ObjName, 
SQLDMO_LPBSTR pRetVal);

注意：
SQL Distributed Management Objects (SQL-DMO) strings are returned as OLE BSTR objects. A C/C++ application obtains a reference to the string. The application must release the reference using SysFreeString.

备注

An application written in C++ can use the information returned by the GetColumnSQLVARIANTDataType and GetColumnSQLVARIANTLength methods to allocate an appropriate amount of buffer space in which to manipulate the data retrieved from a sql_variant column.

The application can then call GetColumnSQLVARIANT to return the contents of a sql_variant column as an array. The application can then cast the contents of the array into the required data type.

注意：
If an application calls GetColumnSQLVARIANTDataType on an instance of SQL Server version 7.0, the constant, SQLDMO_E_SQL80ONLY, and the message "This property or method requires Microsoft SQL Server 2000 or later" are returned.

Applies To:

请参阅

参考

GetColumnSQLVARIANT Method
GetColumnSQLVARIANTLength Method

帮助和信息

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