sig
type stmt
type result
val create : Mysql.dbd -> string -> Mysql.Prepared.stmt
val execute : Mysql.Prepared.stmt -> string array -> Mysql.Prepared.result
val affected : Mysql.Prepared.stmt -> int64
val insert_id : Mysql.Prepared.stmt -> int64
val real_status : Mysql.Prepared.stmt -> int
val fetch : Mysql.Prepared.result -> string option array option
val close : Mysql.Prepared.stmt -> unit
end