# Module type Netcgi_dbi.DBI_DRIVER

    module type DBI_DRIVER = sig .. end

    type connection

    val connect : ?host:string ->
           ?port:string ->
           ?user:string ->
           ?password:string -> string -> connection

    val close : connection -> unit

    val closed : connection -> bool

    val commit : connection -> unit

    val ping : connection -> bool

    val rollback : connection -> unit