GetColumnSQLVARIANTDataType Method
This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
The GetColumnSQLVARIANTDataType method retrieves the underlying data type of the specified sql_variant column.
Syntax
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);
Note
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.
Remarks
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.
Note
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:
See Also
Reference
GetColumnSQLVARIANT Method
GetColumnSQLVARIANTLength Method