AllowNulls Property

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Dieses Feature wird in einer zukünftigen Version von Microsoft SQL Server entfernt. Verwenden Sie dieses Feature beim Entwickeln neuer Anwendungen nicht, und planen Sie das Ändern von Anwendungen, in denen es zurzeit verwendet wird.

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

Syntax

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);

Hinweise

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