SQL Server Connections Strings for SQL Server

Readers of my blog know how passionate I am connecting Access to SQL Server, it’s one of my favorite ways to deploy my solutions. Today I’m going to talk about the different methods and connection strings you can use to connect between Access and SQL Server.

Two Drivers Available
You have two sets of drivers available when connecting: use the standard driver that ships with every Windows station and SQL Server Native Client. The latter is recommended since I’ve personally seen better speeds connecting with SQL using it. You can download the client here, just navigate to the section called “Microsoft SQL Server 2008 Native Client”. Make sure you pick the version compatible with your operating system.

ODBC Connection
The easiest way to connect with SQL would be creating a DSN on the local machine and use it to link SQL tables in Access. This is also the least recommended, since you have to repeat the process for every computer using your Access with SQL database. You can also distribute a DSN file with your application as well. If you installed SQL Server Native Client then you will see both the old SQL Server driver and the new one as an option when creating the DSN. If you decide to use SQL Server Native client you will also need to install it on the local machine when installing your solution.

DSNless Connections
This is the preferred method in connecting with SQL, there is no need to create a DSN on each machine, thus avoiding all the hassles in visiting each machine when you’re ready to roll out the database. When creating DSNless or connecting with ADODB to SQL, you have four options: Old vs new SQL drivers and Integrated Security or SQL Server logins.

Integrated security means you are using the user’s windows credentials when connecting with SQL and is the preferred method in connecting. It allows you to leverage domain credentials and security to easily manage user rights in your application.

The other connection method is using SQL Server security. It’s the only method available if the SQL Server is on the Internet and your users are connecting from the road. If you go this route you will need to pass along the user name and password in order to validate your connection.

Here is an example of Integrated Security with the Windows standard SQL server driver:

stConnect = “ODBC;DRIVER=SQL Server;SERVER=” & stServer & “;DATABASE=” & stDatabase &  _ “;Trusted_Connection=Yes”

and here’s one using SQL Server security:

stConnect = “ODBC;DRIVER=SQL Server;SERVER=” & stServer & “;DATABASE=” & stDatabase & “;UID=” & stUsername & “;PWD=” & stPassword

Here is an example using SQL Server Native Client 10.0:

stConnect = “ODBC;DRIVER=SQL Server Native Client 10.0;SERVER=” & stServer & “;DATABASE=” & stDatabase & “;UID=” & stUsername & “;PWD=” & stPassword

 

Bypass ODBC in your code
You should bypass the ODBC layer altogether when connecting to SQL Sever by using a connection string similar to this one in your code:

stConnect = “Provider=SQLOLEDB;Data Source=” & stServer & “;Initial Catalog=” & stDatabase & “;Integrated Security=SSPI;”

Or if you’re using native client:

stConnect = “Provider=SQLNCLI10;Data Source=” & stServer & “;Initial Catalog=” & stDatabase & “;Integrated Security=SSPI;”

You can see additional examples here.

Don’t forget the instance name!
When connecting to a SQL Server Express database, you must include the instance name along with the server name. For example, the default instance name when installing Express is “SQLExpress”, if you’re connecting to a server called “DEVServer” than the server portion of your connection string should be: “DEVServerSQLExpress”

 

 

About

Juan Soto is a Senior Access Developer at IT Impact Inc. and a Microsoft Access MVP. He specializes in Access with SQL Server databases. His passion for Access has led him to helping a wide range of businesses in helping them establish a secure, stable and efficient environment with SQL Server. He's a frequent speaker at Access user groups nationwide and recently spoke at the Orange County SQL Saturday # 73. If you wish to have Juan speak at your next group meeting you can contact him here.

Posted in Access Help, SQL Server
12 comments on “SQL Server Connections Strings for SQL Server
  1. Jose says:

    Juan,

    I am new to application development so please sorry for the ignorance. I built a MS Access front end with a SQL Server Backend. However, I used the DNS approach not knowing that each user machine will need a DNS created. I see the DNSless example above but I am not sure how to implement into my solution. Where do I write the code? Can I write it once then my application will have access to all SQL Server tables? Thanks in advance for you help.

    • Ben Clothier says:

      Jose,

      Generally, you’d use a standard module and add a procedure that you would call at startup to create the connection.

      To see an example of such thing, have a look at this article. I hope that helps.

  2. I truly have a tendency to go along with every aspect that was
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    Strings for Microsoft Access | accessexperts.com”. I am grateful for pretty much all the actual information.
    I appreciate it-Mariel

  3. Sonny says:

    Thanks for Great Article Juan
    I now have access2007 connected to an sqlserver.
    I’m completley new to ADO but have a rudimentary knowledge of SQL/VBA/DAO
    It took a bit of fiddling around and trial and error but essentially took me about 3 hours
    to scale up my Access application from an accessFE & BE to an access FE/SQLserver backend
    and be able to connect to it

    the global variables and the OpenMyRecordset and ExecuteMyCommand
    will be a big help to convert my functions

    Cheers

  4. Rx says:

    Integrated Security=SSPI;” Just noticed – both of your examples are the same. I need the string for SQL Server Security. My front-end will connect to SQL Server and be distributed via Citrix. It helps with security, lowers bandwidth and we even have Apple users that are happy with MS Access.

    • Juan Soto says:

      The first two examples demonstrate using integrated security and SQL Server security. The latter two demonstrate using the native SQL client vs. the standard ODBC driver that comes with Windows.

  5. Rx says:

    One of the best DSNLess examples out there. For my Access 2010 to SQL 2008, I noticed that SQL Server Native Client 10 converted all my date /time fields perfectlly when useing it manually as part of the ODBC connection.
    Building code for my tables DNSLess to connect to a SQL Server 2008 R2 on a virutal server. What would the connection string be any different than SQL Express?

    • Juan Soto says:

      With SQL Express you need to include the server instance, for example, the default instance is SQLExpress so that the proper way to connect would be the server IP followed by the instance and the port if it’s different than the standard port:
      SQLServerIPSQLExpress,1433

  6. Dave says:

    Hi Juan,

    I recently came across an odd thing that I can’t explain. If I use DRIVER={SQL Server}; in place or DRIVER=SQL Server; in my connections string my re-linking takes twice as long to complete. Can you explain why this is?

    Thanks
    Dave

1 Pings/Trackbacks for "SQL Server Connections Strings for SQL Server"
  1. [...] Fast Connection to SQL: By using ADODB objects and SQLOLEDB connection strings I bypass the ODBC layer altogether and connect straight to SQL, making my app that much more quicker. I’ll be writing an article on SQLOLDB next. [...]

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