ProtocolField.SqlExpression Property

Gets or sets the Transact-SQL expression that computes the protocol field value.

Пространство имен: Microsoft.SqlServer.Management.Nmo
Сборка: Microsoft.SqlServer.Smo (in microsoft.sqlserver.smo.dll)

Синтаксис

'Декларация
Public Property SqlExpression As String

public string SqlExpression { get; set; }

public:
property String^ SqlExpression {
    String^ get ();
    void set (String^ value);
}

/** @property */
public String get_SqlExpression ()

/** @property */
public void set_SqlExpression (String value)

public function get SqlExpression () : String

public function set SqlExpression (value : String)

Значение свойства

A String, between 0 and 4000 characters in length, that specifies the Transact-SQL statement that computes the field value.

Замечания

A Transact-SQL expression is a combination of identifiers, values, and operators that the Database Engine can evaluate to get a result. You can use any expression that can be part of a SELECT statement. The terms of the expression can be any of the following:

• Constants.

• Calls to functions.

• The notification fields defined in the ADF (but not computed fields).

• The following built-in notification fields:

  • SubscriberId

  • DeviceName

  • DeviceTypeName

  • DeviceAddress

  • SubscriberLocale

  • DeliveryChannelName

For more information, see Выражения (компонент Database Engine).

Enclose string constants in single quotation marks.

If the ProtocolField does not use a SqlExpression property it must use a FieldReference property instead.

Пример

The following examples show how to define a protocol field that uses a Transact-SQL expression to generate the protocol field value:

ProtocolField smtpProtocolField1 = 
    new ProtocolField(smtpProtocol, "Subject");
smtpProtocolField1.SqlExpression = 
    "'Flight notification: '+CONVERT (NVARCHAR(30), GETDATE())";
smtpProtocol.ProtocolFields.Add(smtpProtocolField1);

Dim smtpProtocolField1 As ProtocolField = _
    New ProtocolField(smtpProtocol, "Subject")
smtpProtocolField1.SqlExpression = _
    "'Flight notification: '+CONVERT (NVARCHAR(30), GETDATE())"
smtpProtocol.ProtocolFields.Add(smtpProtocolField1)

Синхронизация потоков

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Платформы

Платформы разработки

Список поддерживаемых платформ см. в разделе Hardware and Software Requirements for Installing SQL Server 2005.

Целевые платформы

Список поддерживаемых платформ см. в разделе Hardware and Software Requirements for Installing SQL Server 2005.

См. также

Справочник

ProtocolField Class
ProtocolField Members
Microsoft.SqlServer.Management.Nmo Namespace

Другие ресурсы

Protocol Element (ADF)
SqlExpression Element for Protocol/Fields/Field (ADF)