Column2 Object
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 Column2 object represents the properties of a single column in a table in Microsoft SQL Server 2000 and later and extends the functionality of the Column object.
注释
The Column2 object extends the functionality of the Column object for use with features that were introduced in SQL Server 2000. It also inherits the properties and methods of the Column object. With the Column2 object, you can:
Retrieve information about column-level collation.
Set and retrieve attributes of image columns used in a full-text index.
Alter the data type of a column.
The methods and properties of the Column2 object may not be compatible with instances of SQL Server version 7.0 or earlier. For more information about using the Column2 object in an application that also runs with an instance of SQL Server 7.0, refer to the Remarks section for specific methods and properties. For more information, see Programming Extended SQL-DMO Objects.