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AcquireConnections メソッド

接続マネージャへの接続を確立します。

名前空間:  Microsoft.SqlServer.Dts.Pipeline
アセンブリ:  Microsoft.SqlServer.PipelineHost (Microsoft.SqlServer.PipelineHost.dll)

構文

'宣言
Public Overridable Sub AcquireConnections ( _
    transaction As Object _
)
'使用
Dim instance As PipelineComponent
Dim transaction As Object

instance.AcquireConnections(transaction)

public virtual void AcquireConnections(
    Object transaction
)

public:
virtual void AcquireConnections(
    Object^ transaction
)

abstract AcquireConnections : 
        transaction:Object -> unit 
override AcquireConnections : 
        transaction:Object -> unit 

public function AcquireConnections(
    transaction : Object
)

パラメーター

説明

AcquireConnections は、コンポーネントのデザイン時と実行時の両方で呼び出されます。外部データ ソースに接続するコンポーネントは、このメソッドの間にこれらの接続を確立する必要があります。このメソッドで確立されたすべての接続は、ローカル メンバ変数にキャッシュし、ReleaseConnections メソッドで解放する必要があります。接続は、AcquireConnections のみで確立する必要があります。

使用例

次の例は、AcquireConnections の間に ADO.NET 接続マネージャに接続するコンポーネントを示します。

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