IsValidKeyDatatype 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 IsValidKeyDatatypemethod returns TRUE when the data type specified can participate in a PRIMARY KEY or FOREIGN KEY constraint.
語法
object.IsValidKeyDatatype(Type , [ ReferencingType ] )
Parts
object
Expression that evaluates to an object in the Applies To list.Type
String that identifies a single base or user-defined data type by name.ReferencingType
Optional. A string that identifies a second base or user-defined data type by name.
Prototype (C/C++)
HRESULT IsValidKeyDatatype(
SQLDMO_LPCSTR szKeyColType,
LPBOOL pRetVal,
SQLDMO_LPCSTR szReferencingColType = NULL);
Returns
TRUE or FALSE as described in Remarks.
備註
When only the Type argument is used, the IsValidKeyDatatype method returns TRUE when a column defined using the data type can participate in a PRIMARY KEY constraint.
When a second data type is specified in the ReferencingType argument, the IsValidKeyDatatype method returns TRUE when the types are compatible. A TRUE return value indicates that a column defined using one data type could reference a column defined using the other data type in a FOREIGN KEY constraint.