Question

I’m working against a Informix DB from C# ASP .Net 4.0 via an ODBC connection. This database does change frequently so I read out what DBs that are installed from the sysmaster table.

Depending on choice my user makes I need to setup a ODBC connection to the choosen DB or change the current connection to change from the systmaster DB to the one choosen.

Anyone got any idea how to do this? I suspect it must be possible to setup a temporary ODBC connection. Also in Visual Studio under the properties for my ODBC connection I do have a connection string looking like this:

Dsn=Informix;uid=xxxxx;database=sysmaster;host=10.10.10.10;srvr=testdb1;serv=3000;pro=onsoctcp;cloc=en_US.819;dloc=en_US.819;vmb=0;curb=0;scur=0;icur=0;oac=1;optofc=0;rkc=0;odtyp=0;ddfp=0;dnl=0;rcwc=0

I have looked around for a library to connect directly without the ODBC to informix but with now success.

Thanks,
Stefan

Answer 1

I have worked out a working solution that is quite nice. I did not realise .NET had full support to do this from code behind without actually modifying the ODBC settings.

    const string sConnString = "Driver=Informix;uid=user;pwd=password;database=x10stg01_1312;host=10.10.10.10;srvr=testdb1;serv=3000;pro=onsoctcp;cloc=en_US.819;dloc=en_US.819;vmb=0;curb=0;scur=0;icur=0;oac=1;optofc=0;rkc=0;odtyp=0;ddfp=0;dnl=0;rcwc=0";
    var oOdbcConnection = new System.Data.Odbc.OdbcConnection(sConnString);

    string queryString =
        "SELECT * FROM tevoc WHERE ev_oc_id=6599098";
    OdbcCommand command = new OdbcCommand(queryString);

    command.Connection = oOdbcConnection;
    oOdbcConnection.Open();
    OdbcDataReader odbcDataReader = command.ExecuteReader();

    while (odbcDataReader.Read())
    {
        CheckDiv.InnerHtml += "Result: " + odbcDataReader.GetString(6) + "<br/>";
    }

I guess you have to setup a working ODBC connection one before trying the code behind to just be sure the Driver can be located ok or at least look in the list of available ODBC drivers.