GetColumnSQLVARIANTDataType Method
Esta característica se quitará en una versión futura de Microsoft SQL Server. Evite utilizar esta característica en nuevos trabajos de desarrollo y tenga previsto modificar las aplicaciones que actualmente la utilizan.
The GetColumnSQLVARIANTDataTypemethod retrieves the underlying data type of the specified sql_variant column.
Sintaxis
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);
Nota
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.
Comentarios
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.
Nota
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.