AlterDataType Method

Diese Funktion wird in zukünftigen Versionen von Microsoft SQL Server nicht mehr bereitgestellt. Verwenden Sie diese Funktion beim Entwickeln neuer Anwendungen nicht, und planen Sie das Ändern von Anwendungen, in denen es zurzeit verwendet wird.

The AlterDataType method alters the data type of the referenced column.

Syntax

object
.AlterDataType(
Datatype
, [ Length ] , [ Precision ] , [ Scale ] )

Parts

• object
  Expression that evaluates to an object in the Applies To list.

• DataType
  String that specifies the new data type.

• Length
  Optional long integer that specifies the length of a string data type.

• Precision
  Optional long integer that specifies the precision of a numeric data type.

• Scale
  Optional long integer that specifies the scale of a numeric data type.

Prototype (C/C++)

HRESULT AlterDataType(
SQLDMO_LPCSTR DataType, 
long Length,
long Precision,
long Scale);

Hinweise

When using AlterDataType to convert the data type of an existing column to a new data type, the two data types must be compatible. For example, an int data type can be converted to a decimal data type, and a char data type can be converted to an nvarchar data type. However string data types cannot be converted to numeric data types.

Hinweis
If an application calls AlterDataType 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" are returned.

Applies to:

Column2 Object

Siehe auch

Verweis

Datatype Property