GetColumnSQLVARIANTDataType Method
未來的 Microsoft SQL Server 版本將移除這項功能。請避免在新的開發工作中使用這項功能，並規劃修改目前使用這項功能的應用程式。
The GetColumnSQLVARIANTDataTypemethod retrieves the underlying data type of the specified sql_variant column.
語法
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);
[!附註]
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.
備註
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_variantcolumn.
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.
[!附註]
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.