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What is the difference between System.Data.SqlClient, System.Data.OledbClient and System.Data.OdbcClient for accessing sql data.

    Question

  • I would like to know what will be the difference between the sqlclient or oledbclient or odbcclient for accessing data from SQL Server relational database. I would like to point my question in the performance direction.
    Thursday, February 18, 2010 5:31 AM

Answers

  • odbcclient and oledbclient are using native ODBC driver or OleDb provider. These are bridge for some data source that does not ship the managed provider.
    sqlclient is using the "managed ADO.net provider for SQL Server", which is written in managed code.

    For performance aspect and many other aspects, the recommendation is to use the "sqlclient" since there are less switching between managed code and native code.

    Thanks,
    Ming.
    WDAC Team, Microsoft.
    Pak-Ming Cheung - MSFT
    Thursday, February 18, 2010 10:36 AM
    Answerer
  • In addition to what has been said


    System.Data.SQLClient

     

    Can only be used for connecting to SQL Server 2000 and later. But you will get optimal performance when connecting to those databases.

     

    System.Data.OledbClient

     

    Can be used to connected to SQL 6.5

     

    OLEDBClient gives you ability to connect to other database like ORALCE or Access. But for working with SQL Server you will get better performance using SQLClient.

     

    Note: For connecting to ORALCE Microsoft also has ORACLEClient.

     

     

    System.Data.ODBCClient provides connection to legacy databases ( e.g. MS Access 97) using ODBC drivers.

    Thursday, February 18, 2010 2:58 PM

All replies

  • odbcclient and oledbclient are using native ODBC driver or OleDb provider. These are bridge for some data source that does not ship the managed provider.
    sqlclient is using the "managed ADO.net provider for SQL Server", which is written in managed code.

    For performance aspect and many other aspects, the recommendation is to use the "sqlclient" since there are less switching between managed code and native code.

    Thanks,
    Ming.
    WDAC Team, Microsoft.
    Pak-Ming Cheung - MSFT
    Thursday, February 18, 2010 10:36 AM
    Answerer
  • In addition to what has been said


    System.Data.SQLClient

     

    Can only be used for connecting to SQL Server 2000 and later. But you will get optimal performance when connecting to those databases.

     

    System.Data.OledbClient

     

    Can be used to connected to SQL 6.5

     

    OLEDBClient gives you ability to connect to other database like ORALCE or Access. But for working with SQL Server you will get better performance using SQLClient.

     

    Note: For connecting to ORALCE Microsoft also has ORACLEClient.

     

     

    System.Data.ODBCClient provides connection to legacy databases ( e.g. MS Access 97) using ODBC drivers.

    Thursday, February 18, 2010 2:58 PM
  • Thanks for crisp answers Pak-Ming Cheung and Chirag Shah. :)
    Sunday, February 21, 2010 1:35 PM
  • Hi,

    Could you please explain how System.Data.SQLClient is implemented? is it using OLEDB internally?

    I am looking for clear differentiation between System.Data.SQLClient and System.Data.OledbClient

    Regards

    Kishore

    Tuesday, July 17, 2018 12:29 AM
  • Could you please explain how System.Data.SQLClient is implemented? is it using OLEDB internally?

    I am looking for clear differentiation between System.Data.SQLClient and System.Data.OledbClient

    The big differentiators between SqlClient and OleDbClient (and OdbcClient too) are:

    1) SqlClient is managed (.NET). OleDbClient is a .NET wrapper of an unmanaged OLE DB provider

    2) SqlClient only works with SQL Server. OleDbClient can use any relational DBMS that has an OLE DB driver

    3) SqlClient is included with .NET. OleDbClient requires a separately installed OLE DB driver (although one could use the legacy SQLOLEDB provider that ships with windows).

    As mentioned earlier in this thread, .NET applications should always use SqlClient for SQL Server data access. It is also best to use a managed provider for other DBMS products when one is available. OleDbClient or OdbcClient should are intended to be used in .NET apps only when a suitable managed provider is not available.


    Dan Guzman, Data Platform MVP, http://www.dbdelta.com

    Tuesday, July 17, 2018 1:03 AM
    Moderator
  • Could you please explain how System.Data.SQLClient is implemented? is it using OLEDB internally?
    No, it is a ground-up implementation that talks to SQL Server directly through the TDS protocol. It has no relation to OLE DB or ODBC.

    Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

    Tuesday, July 17, 2018 7:51 AM
  • Thanks for your reply.

    Could you provide link where i can find SqlCliet using TDS protocol.?

    Regards

    Kishore

    Tuesday, July 17, 2018 9:44 AM
  • Could you provide link where i can find SqlCliet using TDS protocol.?

    Here's a link to the TDS protocol spec: https://msdn.microsoft.com/en-us/library/dd304523.aspx

    There is nothing unique to SqlClient in it's use of TDS; all SQL Server client APIs communicate with SQL Server over the TDS protocol. The job of client APIs is to establish and manage the TDS session. This is largely an implementation detail transparent to applications. You could run a network trace to see the low-level interaction between client and server. Some network tracing tools (e.g. Wireshark) can parse the TDS messages (unless they are encrypted).


    Dan Guzman, Data Platform MVP, http://www.dbdelta.com

    Tuesday, July 17, 2018 12:25 PM
    Moderator