package ppx_mysql
Syntax extension for facilitating usage of MySQL bindings
Install
Dune Dependency
Authors
Maintainers
Sources
ppx_mysql-1.1.3.tbz
sha256=7ac90d54b649692b9d2c2bedb3a2f9cce4d100d4db5443fc482f1e8337e19911
sha512=d47a05607a526bb1c2f3a0a3a79f84d181362810845f2c1e1004b80cb41ee748e9216be971c5e3c9c1e4027eec91de2d9effe57fd8e0d83b8861d5d0bfd6c3d1
doc/src/ppx_mysql.runtime/ppx_mysql_runtime.ml.html
Source file ppx_mysql_runtime.ml
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type deserialization_error = { idx : int; name : string; func : string; value : string; message : string } type column_error = [ `Expected_non_null_column of int * string | `Deserialization_error of deserialization_error ] type 'a deserializer = string -> ('a, string) result let wrap_failure : (string -> 'a) -> 'a deserializer = fun of_string s -> match of_string s with | v -> Ok v | exception Failure _ -> Error "cannot parse number" let string_of_string str = Ok str let int_of_string = wrap_failure Stdlib.int_of_string let int32_of_string = wrap_failure Int32.of_string let int64_of_string = wrap_failure Int64.of_string let bool_of_string str = match Stdlib.int_of_string str with | v -> Ok (v <> 0) | exception Failure _ -> Error "cannot parse boolean" external identity : 'a -> 'a = "%identity" let deserialize_non_nullable_column idx name of_string func err_accum = function | None -> let err = `Expected_non_null_column (idx, name) in None, err :: err_accum | Some value -> ( match of_string value with | Ok ok -> Some ok, err_accum | Error message -> let err = `Deserialization_error {idx; name; func; value; message} in None, err :: err_accum ) let deserialize_nullable_column idx name of_string func err_accum = function | None -> Some None, err_accum | Some value -> ( match of_string value with | Ok ok -> Some (Some ok), err_accum | Error message -> let err = `Deserialization_error {idx; name; func; value; message} in None, err :: err_accum ) module type SERIALIZABLE = sig type t val of_mysql : string -> (t, string) result val to_mysql : t -> string end module type PPX_MYSQL_CONTEXT_ARG = sig module IO : sig type 'a t val return : 'a -> 'a t val bind : 'a t -> ('a -> 'b t) -> 'b t end module Prepared : sig type dbh type stmt type stmt_result type error val create : dbh -> string -> (stmt, error) result IO.t val close : stmt -> (unit, error) result IO.t val execute_null : stmt -> string option array -> (stmt_result, error) result IO.t val fetch : stmt_result -> (string option array option, error) result IO.t end end module type PPX_MYSQL_CONTEXT = sig module IO : sig type 'a t val return : 'a -> 'a t val bind : 'a t -> ('a -> 'b t) -> 'b t val ( >>= ) : 'a t -> ('a -> 'b t) -> 'b t end module IO_result : sig type ('a, 'e) t = ('a, 'e) result IO.t val return : 'a -> ('a, 'e) t val bind : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t val ( >>= ) : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t end module Prepared : sig type dbh type stmt type stmt_result type error type wrapped_dbh type wrapped_error = [`Mysql_error of error] val init : dbh -> wrapped_dbh val execute_null : stmt -> string option array -> (stmt_result, [> wrapped_error]) result IO.t val fetch : stmt_result -> (string option array option, [> wrapped_error]) result IO.t val with_stmt_cached : wrapped_dbh -> string -> (stmt -> ('a, ([> wrapped_error] as 'e)) result IO.t) -> ('a, 'e) result IO.t val with_stmt_uncached : wrapped_dbh -> string -> (stmt -> ('a, ([> wrapped_error] as 'e)) result IO.t) -> ('a, 'e) result IO.t end end module Make_context (M : PPX_MYSQL_CONTEXT_ARG) : PPX_MYSQL_CONTEXT with type 'a IO.t = 'a M.IO.t and type Prepared.dbh = M.Prepared.dbh and type Prepared.error = M.Prepared.error = struct module IO = struct include M.IO let ( >>= ) = bind end module IO_result = struct type ('a, 'e) t = ('a, 'e) result IO.t let return x = IO.return @@ Ok x let bind x f = IO.bind x (function | Ok v -> f v | Error _ as e -> IO.return e ) let ( >>= ) = bind end module Prepared = struct type dbh = M.Prepared.dbh type stmt = M.Prepared.stmt type stmt_result = M.Prepared.stmt_result type error = M.Prepared.error type wrapped_dbh = { dbh : dbh; stmt_cache : (string, stmt) Hashtbl.t } type wrapped_error = [`Mysql_error of error] let wrap f x = IO.bind (f x) @@ function | Ok _ as ok -> IO.return ok | Error err -> IO.return @@ Error (`Mysql_error err) let init dbh = {dbh; stmt_cache = Hashtbl.create 16} let create dbh sql = wrap (M.Prepared.create dbh) sql let create_or_reuse {dbh; stmt_cache} sql = match Hashtbl.find_opt stmt_cache sql with | Some stmt -> IO_result.return stmt | None -> IO_result.bind (create dbh sql) @@ fun stmt -> Hashtbl.replace stmt_cache sql stmt; IO_result.return stmt let close stmt = wrap M.Prepared.close stmt let execute_null stmt args = wrap (M.Prepared.execute_null stmt) args let fetch stmt_res = wrap M.Prepared.fetch stmt_res let with_stmt_cached wrapped_dbh sql f = IO_result.bind (create_or_reuse wrapped_dbh sql) @@ fun stmt -> f stmt let with_stmt_uncached {dbh; stmt_cache = _} sql f = IO_result.bind (create dbh sql) @@ fun stmt -> IO.bind (f stmt) @@ fun res -> IO.bind (close stmt) @@ function | Ok () -> IO.return res | Error _ as e -> IO.return e end end module Stdlib = struct module Array = Array module List = List module Option = struct type 'a t = 'a option = | None | Some of 'a let map f = function | Some x -> Some (f x) | None -> None let get = function | Some x -> x | None -> invalid_arg "Option.get" end module Result = struct type ('a, 'e) t = ('a, 'e) result = | Ok of 'a | Error of 'e let bind r f = match r with | Ok x -> f x | Error _ as e -> e let ( >>= ) = bind end module String = struct include String let append = ( ^ ) end let ( = ) = ( = ) end
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