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IsConnected (clsDataSource)

HinweisHinweis

  Diese Funktion wird in der nächsten Version von Microsoft SQL Server entfernt. Verwenden Sie diese Funktion beim Entwickeln neuer Anwendungen nicht, und planen Sie so bald wie möglich das Ändern von Anwendungen, in denen es zurzeit verwendet wird.

The IsConnected method of an object of ClassType clsDataSource verifies the connection to the data source specified by the ConnectionString property. If the data source is not connected, the method attempts to connect to the source.

Syntax

bRet = object.IsConnected(ErrorMsg As String)

Parameter

  • bRet
    A Boolean variable that receives the returned value: True is returned if the data source is connected, False if the connection cannot be established.

  • object
    An object of ClassTypeclsDataSource.

  • ErrorMsg
    An optional string variable that receives the error definition if the connection cannot be established.

Hinweise

If the data source is already connected when the method is executed, the method returns True. If the data source is not connected, the method attempts to connect to the data source, returning True if the connection is established or False if the connection cannot be established.

It is not necessary to establish a connection to a data source before it can be used. Decision Support Objects (DSO) will automatically establish the connection when necessary (for example, to read a property value from the source database or to access data in the database).

Beispiel

Use the following code to establish a connection to a data source with the IsConnected property:

'Assume an object (dsoDS) of ClassType clsDataSource exists 
If Not dsoDS.IsConnected Then
   ' Code to handle connection error
Else 
   ' Connection is established 
End If