SQL Server 2005 connection strings

.NET Framework Data Provider for SQL Server

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SQL Server Native Client 10.0 OLE DB Provider

SQL Native Client 9.0 OLE DB Provider

SQLXML 4.0 OLEDB Provider

.NET Framework Data Provider for OLE DB

  • Use an OLE DB provider from .NET

    Provider=any oledb provider's name;OledbKey1=someValue;OledbKey2=someValue;

    See the respective OLEDB provider's connection strings options. The .net OleDbConnection will just pass on the connection string to the specified OLEDB provider. Read more here.

SQL Server Native Client 10.0 ODBC Driver

SQL Native Client 9.0 ODBC Driver

  • Standard security

    Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;
    Uid
    =myUsername;Pwd=myPassword;

    Are you using SQL Server 2005 Express? Don't miss the server name syntax Servername\SQLEXPRESS where you substitute Servername with the name of the computer where the SQL Server 2005 Express installation resides.

    When to use SQL Native Client?

  • Trusted Connection

    Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;
    Trusted_Connection
    =yes;

    Equivalent key-value pair: "Integrated Security=SSPI" equals "Trusted_Connection=yes"

  • Connecting to an SQL Server instance

    The syntax of specifying the server instance in the value of the server key is the same for all connection strings for SQL Server.

    Driver={SQL Native Client};Server=myServerName\theInstanceName;
    Database
    =myDataBase;Trusted_Connection=yes;
  • Prompt for username and password

    This one is a bit tricky. First you need to set the connection object's Prompt property to adPromptAlways. Then use the connection string to connect to the database.

    oConn.Properties("Prompt") = adPromptAlways

    oConn.Open "Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;"
  • Enable MARS

    Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;
    Trusted_Connection
    =yes;MARS_Connection=yes;
  • Encrypt data sent over network

    Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;
    Trusted_Connection
    =yes;Encrypt=yes;
  • Attach a database file on connect to a local SQL Server Express instance

    Driver={SQL Native Client};Server=.\SQLExpress;AttachDbFilename=c:\mydbfile.mdf;
    Database
    =dbname;Trusted_Connection=Yes;

    Why is the Database parameter needed? If the named database have already been attached, SQL Server does not reattach it. It uses the attached database as the default for the connection.

  • Attach a database file, located in the data directory, on connect to a local SQL Server Express instance

    Driver={SQL Native Client};Server=.\SQLExpress;
    AttachDbFilename
    =|DataDirectory|mydbfile.mdf;Database=dbname;
    Trusted_Connection
    =Yes;

    Why is the Database parameter needed? If the named database have already been attached, SQL Server does not reattach it. It uses the attached database as the default for the connection.

  • Database mirroring

    If you connect with ADO.NET or the SQL Native Client to a database that is being mirrored, your application can take advantage of the drivers ability to automatically redirect connections when a database mirroring failover occurs. You must specify the initial principal server and database in the connection string and the failover partner server.

    Driver={SQL Server Native Client 10.0};Server=myServerAddress;
    Failover_Partner
    =myMirrorServerAddress;Database=myDataBase;
    Trusted_Connection
    =yes;

    There is ofcourse many other ways to write the connection string using database mirroring, this is just one example pointing out the failover functionality. You can combine this with the other connection strings options available.

    Please note if you are using TCP/IP (using the network library parameter) and database mirroring, including port number in the address (formed as servername,portnumber) for both the main server and the failover partner can solve some reported issues.

.NET Framework Data Provider for ODBC

  • Use an ODBC driver from .NET

    Driver={any odbc driver's name};OdbcKey1=someValue;OdbcKey2=someValue;

    See the respective ODBC driver's connection strings options. The .net OdbcConnection will just pass on the connection string to the specified ODBC driver. Read more here.

Context Connection

  • Context Connection

    Connecting to "self" from within your CLR stored prodedure/function. The context connection lets you execute Transact-SQL statements in the same context (connection) that your code was invoked in the first place.

    C#
     using(SqlConnection connection = new SqlConnection("context connection=true"))
     {
         connection.Open();
         // Use the connection
     }

    VB.Net
     Using connection as new SqlConnection("context connection=true")
         connection.Open()
         ' Use the connection
     End Using

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