Hvofor kan jeg ikke update?

    set DbConn = Server.CreateObject(\"ADODB.Connection\")
    dbDir = Server.MapPath(\"./data/tips.mdb\")
    DbConn.Open \"DBQ=\"& dbDir _
      &\";Driver={Microsoft Access Driver (*.mdb)};DriverId=25;FIL=MS Access;\"

sql = \"select * from picks\"
set rs = DbConn.Execute(sql)
rs(\"username\") = \"peter\"
rs.update

**fremkalder følgende**


ADODB.Recordset fejl \'800a0cb3\'

Current Recordset does not support updating. This may be a limitation of the provider, or of the selected locktype.