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Working with Connection Managers Programmatically

In Integration Services, the AcquireConnection method of the associated connection manager class is the method that you call most often when you are working with connection managers in managed code. When you write managed code, you have to call the AcquireConnection method to use the functionality of a connection manager. You have to call this method regardless of whether you are writing managed code in a Script task, Script component, custom object, or custom application.

To call the AcquireConnection method successfully, you have to know the answers to the following questions:

  • Which connection managers return a managed object from the AcquireConnection method?

    Many connection managers return unmanaged COM objects (System.__ComObject) and these objects cannot easily be used from managed code. The list of these connection managers includes the frequently used OLE DB connection manager.

  • For those connection managers that return a managed object, what objects do their AcquireConnection methods return?

    To cast the return value to the appropriate type, you have to know what type of object the AcquireConnection method returns. For example, the AcquireConnection method for the ADO.NET connection manager returns an open SqlConnection object when you use the SqlClient provider. However, the AcquireConnection method for the File connection manager just returns a string.

This topic answers these questions for the connection managers that are included with Integration Services.

Connection Managers That Do Not Return a Managed Object

The following table lists the connection managers that return a native COM object (System.__ComObject) from the AcquireConnection method. These unmanaged objects cannot easily be used from managed code.

Connection Manager Type

Connection Manager Name

ADO

ADO Connection Manager

MSOLAP90

Analysis Services Connection Manager

EXCEL

Excel Connection Manager

FTP

FTP Connection Manager

HTTP

HTTP Connection Manager

ODBC

ODBC Connection Manager

OLEDB

OLE DB Connection Manager

Typically, you can use an ADO.NET connection manager from managed code to connect to an ADO, Excel, ODBC, or OLE DB data source.

Return Values from the AcquireConnection Method

The following table lists the connection managers that return a managed object from the AcquireConnection method. These managed objects can easily be used from managed code.

Connection Manager Type

Connection Manager Name

Type of Return Value

Additional Information

ADO.NET

ADO.NET Connection Manager

System.Data.SqlClient.SqlConnection

FILE

File Connection Manager

System.String

Path to the file.

FLATFILE

Flat File Connection Manager

System.String

Path to the file.

MSMQ

MSMQ Connection Manager

System.Messaging.MessageQueue

MULTIFILE

Multiple Files Connection Manager

System.String

Path to one of the files.

MULTIFLATFILE

Multiple Flat Files Connection Manager

System.String

Path to one of the files.

SMOServer

SMO Connection Manager

Microsoft.SqlServer.Management.Smo.Server

SMTP

SMTP Connection Manager

System.String

For example: SmtpServer=<server name>;UseWindowsAuthentication=True;EnableSsl=False;

WMI

WMI Connection Manager

System.Management.ManagementScope

SQLMOBILE

SQL Server Compact Connection Manager

System.Data.SqlServerCe.SqlCeConnection
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