PipelineComponent.AcquireConnections(Object) Método

Definição

Namespace:

Microsoft.SqlServer.Dts.Pipeline

Assembly:

Microsoft.SqlServer.PipelineHost.dll

Estabelece uma conexão com um gerenciador de conexões.

public:
 virtual void AcquireConnections(System::Object ^ transaction);

public virtual void AcquireConnections (object transaction);

abstract member AcquireConnections : obj -> unit
override this.AcquireConnections : obj -> unit

Public Overridable Sub AcquireConnections (transaction As Object)

Parâmetros

transaction

Object

A transação na qual a conexão está participando.

Exemplos

O exemplo a seguir mostra um componente que se conecta a um gerenciador de conexões ADO.NET durante AcquireConnections.

public override void AcquireConnections(object transaction)  
{  
    if (ComponentMetaData.RuntimeConnectionCollection[0].ConnectionManager != null)  
    {  
            // Convert the native IDTSConnectionManager100 to the managed ConnectionManager,  
            // then retrieve the underlying connection through the InnerObject.  
            ConnectionManager cm = Microsoft.SqlServer.Dts.Runtime.DtsConvert.ToConnectionManager(ComponentMetaData.RuntimeConnectionCollection[0].ConnectionManager);  
            ConnectionManagerAdoNet cmado = cm.InnerObject  as ConnectionManagerAdoNet;  

            // If the InnerObject is not an ConnectionManagerAdoNet, then  
            // the cmado object is null.  
            if( cmado == null )  
                throw new Exception("The ConnectionManager " + cm.Name + " is not an ADO.NET connection.");  

            // Get the underlying connection object.  
            this.oledbConnection = cmado.AcquireConnection(transaction) as OleDbConnection;  

            if( this.oledbConnection == null )  
                throw new Exception("The ConnectionManager " + cm.Name + " is not an ADO.NET connection.");  

            isConnected = true;  
    }  
}  

Public Overrides Sub AcquireConnections(ByVal transaction As Object)   
 If Not (ComponentMetaData.RuntimeConnectionCollection(0).ConnectionManager Is Nothing) Then   
   ' Convert the native IDTSConnectionManager100 to the managed ConnectionManager,  
   '  then retrieve the underlying connection through the InnerObject.  
   Dim cm As ConnectionManager = Microsoft.SqlServer.Dts.Runtime.DtsConvert.ToConnectionManager(ComponentMetaData.RuntimeConnectionCollection(0).ConnectionManager)   
   Dim cmado As ConnectionManagerAdoNet = CType(ConversionHelpers.AsWorkaround(cm.InnerObject, GetType(ConnectionManagerAdoNet)), ConnectionManagerAdoNet)   
   ' If the InnerObject is not an ConnectionManagerAdoNet, then  
   '  the cmado object is null.  
   If cmado Is Nothing Then   
     Throw New Exception("The ConnectionManager " + cm.Name + " is not an ADO.NET connection.")   
   End If   
   ' Get the underlying connection object.  
   Me.oledbConnection = CType(ConversionHelpers.AsWorkaround(cmado.AcquireConnection(transaction), GetType(OleDbConnection)), OleDbConnection)   
   If Me.oledbConnection Is Nothing Then   
     Throw New Exception("The ConnectionManager " + cm.Name + " is not an ADO.NET connection.")   
   End If   
   isConnected = True   
 End If   
End Sub  

Comentários

AcquireConnections é chamado durante o design e a execução do componente. Os componentes que se conectam a fontes de dados externas devem estabelecer suas conexões durante esse método. Qualquer conexão estabelecida durante esse método deve ser armazenada em cache em uma variável de membro local e liberada no ReleaseConnections método . As conexões só devem ser estabelecidas durante AcquireConnections.