LogProviderBase.OpenLog Method

Artikkeli
12/03/2008

Called at the beginning of package execution to establish connections to external data sources.

Namespace: Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

Syntax

'Declaration
Public Overridable Sub OpenLog

public virtual void OpenLog ()

public:
virtual void OpenLog ()

public void OpenLog ()

public function OpenLog ()

Remarks

This method is called at the beginning of package execution and prior to any execution events occurring. You should use this method to establish connections to external data sources and prepare to respond to calls to the Log method.

Example

The following example demonstrates connecting to an external text file using the ConnectionManager specified in the ConfigString property. The connection variable was cached from the

InitializeLogProvider method.

public override void OpenLog()
{
    //    Get the ConnectionManager from the package's
    //    Connections collection.
    connectionManager cm = connections[ConfigString];
    //    AcquireConnection for a file ConnectionManager
    //    retrieves the path to the file.
    string path = (string)cm.AcquireConnection(null);
    //    Instantiate the stream writer, and writes the opening
    //    log entry.
    this.sw = new StreamWriter(path);
    sw.WriteLine("OpenLog: " + DateTime.Now.ToShortDateString());
}

Public Overrides  Sub OpenLog()
    '    Get the ConnectionManager from the package's
    '    Connections collection.
    Dim cm As connectionManager =  connections(ConfigString) 
    '    AcquireConnection for a file ConnectionManager
    '    retrieves the path to the file.
    Dim path As String = CType(cm.AcquireConnection(Nothing), String)
    '    Instantiate the stream writer, and writes the opening
    '    log entry.
    Me.sw = New StreamWriter(path)
    sw.WriteLine("OpenLog: " + DateTime.Now.ToShortDateString())
End Sub

Thread Safety

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.

Platforms

Development Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server 2005.

Target Platforms