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Datatype Property

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 Datatype property exposes the data type name for the referenced column.

語法

object.Datatype [=value]

Parts

  • object
    An expression that evaluates to an object in the Applies To list

  • value
    A text string that identifies a Microsoft SQL Server system or user-defined data type

Data Type

String

Modifiable

Read/write before column creation. Read-only when referencing an existing column.

Prototype (C/C++)

HRESULT GetDatatype(SQLDMO_LPBSTR pRetVal);
HRESULT SetDatatype(SQLDMO_LPCSTR NewValue);

[!附註]

SQL Distributed Management Objects (SQL-DMO) strings are always returned as OLE BSTR objects. A C/C++ application obtains a reference to the string. The application must release the reference using SysFreeString.

備註

The Datatype property may not completely define the data type of a column. Columns requiring width specification, such as varchar, or specification of scale and precision, such as decimal, are defined using the Datatype property in concert with Length, NumericPrecision, and NumericScale properties.

Use the AlterDataType method to change the data type of an existing column.

Applies To:

Column Object