LogProviderBase.OpenLog Method

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

命名空间: Microsoft.SqlServer.Dts.Runtime
程序集: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

语法

声明
Public Overridable Sub OpenLog

public virtual void OpenLog ()

public:
virtual void OpenLog ()

public void OpenLog ()

public function OpenLog ()

备注

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.

示例

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

线程安全

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.

平台

开发平台

有关支持的平台列表，请参阅安装 SQL Server 2005 的硬件和软件要求。

目标平台

有关支持的平台列表，请参阅安装 SQL Server 2005 的硬件和软件要求。

请参阅

参考

LogProviderBase Class
LogProviderBase Members
Microsoft.SqlServer.Dts.Runtime Namespace