AllowNulls Property

Esta característica se quitará en una versión futura de Microsoft SQL Server. Evite utilizar esta característica en nuevos trabajos de desarrollo y tenga previsto modificar las aplicaciones que actualmente la utilizan.

The AllowNulls property exposes the ability of a data type to accept NULL as a value.

Sintaxis

object
.AllowNulls [=value]

Parts

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

• value
  TRUE or FALSE

Data Type

Boolean

Modifiable

Read-only for SystemDatatype objects. Read/write for Column and UserDefinedDatatype objects.

Prototype (C/C++)

HRESULT GetAllowNulls(LPBOOL pRetVal);
HRESULT SetAllowNulls(BOOL NewValue);

Comentarios

If TRUE, the Microsoft SQL Server data type or column referenced can accept NULL as a value.

If FALSE, NULL is not allowed.

Set the AllowNulls property to set NULL as an accepted value for columns and user-defined data types.

Applies To:

Column Object	UserDefinedDatatype Object
SystemDatatype Object