NotificationComputedField.SqlExpression Property

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

Espace de noms: Microsoft.SqlServer.Management.Nmo
Assembly: Microsoft.SqlServer.Smo (in microsoft.sqlserver.smo.dll)

Syntaxe

'Déclaration
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)

Valeur de propriété

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

Notes

The SqlExpression property is required.

A Transact-SQL expression is a combination of identifiers, values, and operators that the Moteur de base de données 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 Expressions (moteur de base de données).

If you update the SqlExpression property, updating the application deletes and re-creates the notification class to which it corresponds. This includes dropping and re-creating the Microsoft SQL Server tables used by this notification class. Any data existing in the original SQL Server tables is permanently deleted.

Exemple

The following example shows how to define a computed field for a notification class:

NotificationComputedField computedPrice = 
    new NotificationComputedField(flightNotifications, 
    "FormattedPrice");
computedPrice.SqlExpression = "CONVERT(NVARCHAR(10), Price, 1)";
flightNotifications.NotificationComputedFields.Add(computedPrice);

Dim computedPrice As NotificationComputedField = _
    New NotificationComputedField(flightNotifications, _
    "FormattedPrice")
computedPrice.SqlExpression = "CONVERT(NVARCHAR(10), Price, 1)"
flightNotifications.NotificationComputedFields.Add( _
    computedPrice)

Sécurité des threads

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.