val requestDbUser : {dbtype : string, passwd : string option} -> unit
val requestDbPasswd : {dbtype : string, passwd : string} -> unit
val requestDbTable : {dbtype : string, dbname : string} -> unit
val requestDbUser : {dbtype : string, passwd : string option} -> unit
val requestDbPasswd : {dbtype : string, passwd : string} -> unit
val requestDbTable : {dbtype : string, dbname : string} -> unit