ContactNull Property

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 ContactNull property specifies NULL-value handling for catenation.

语法

object.ContactNull [=value]

Parts

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

• value
  TRUE or FALSE

Data Type

Boolean

Modifiable

Read/write

Prototype (C/C++)

HRESULT GetContactNull(LPBOOL pRetVal);
HRESULT SetContactNull(BOOL NewValue);

注释

If TRUE, A + NULL, where A is a string, yields NULL.

If FALSE, A + NULL, where A is a string, yields A.

Any value for ContactNull is overridden by the AnsiNulls property, which controls NULL catenation behavior for a client session.

Applies To:

DBOption Object