UnbindFromDatatype 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 UnbindFromDatatype method breaks the binding between a Microsoft SQL Server default or rule and a user-defined data type.
语法
object.UnbindFromDatatype(Datatype, [ FutureOnly ] )
Parts
object
Expression that evaluates to an object in the Applies To list.Datatype
String that identifies an existing user-defined data type by name.FutureOnly
When TRUE, columns defined using the data type maintain the rule or default though the default no longer exhibits the behavior.
Prototype (C/C++)
HRESULT UnbindFromDatatype(
SQLDMO_LPCSTR Datatype,
BOOL bFutureOnly = FALSE);