Source file database_migration_repo.ml
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module Migration = struct
type t =
{ namespace : string
; version : int
; dirty : bool
}
[@@deriving fields]
let create ~namespace = { namespace; version = 0; dirty = true }
let mark_dirty state = { state with dirty = true }
let mark_clean state = { state with dirty = false }
let increment state = { state with version = state.version + 1 }
let steps_to_apply (namespace, steps) { version; _ } =
namespace, CCList.drop version steps
;;
let of_tuple (namespace, version, dirty) = { namespace; version; dirty }
let to_tuple state = state.namespace, state.version, state.dirty
let dirty state = state.dirty
end
module type Sig = sig
module Migration = Migration
val create_table_if_not_exists
: ?ctx:(string * string) list
-> string
-> unit Lwt.t
val get
: ?ctx:(string * string) list
-> string
-> namespace:string
-> Migration.t option Lwt.t
val get_all : ?ctx:(string * string) list -> string -> Migration.t list Lwt.t
val upsert
: ?ctx:(string * string) list
-> string
-> Migration.t
-> unit Lwt.t
end
let get_request table =
Caqti_request.find_opt
Caqti_type.string
Caqti_type.(tup3 string int bool)
(Format.sprintf
{sql|
SELECT
namespace,
version,
dirty
FROM %s
WHERE namespace = ?;
|sql}
table)
;;
let get ?ctx table ~namespace =
Database.find_opt ?ctx (get_request table) namespace
|> Lwt.map (Option.map Migration.of_tuple)
;;
let get_all_request table =
Caqti_request.collect
Caqti_type.unit
Caqti_type.(tup3 string int bool)
(Format.sprintf
{sql|
SELECT
namespace,
version,
dirty
FROM %s;
|sql}
table)
;;
let get_all ?ctx table =
Database.collect ?ctx (get_all_request table) ()
|> Lwt.map (List.map Migration.of_tuple)
;;
module MariaDb : Sig = struct
module Migration = Migration
let create_request table =
Caqti_request.exec
Caqti_type.unit
(Format.sprintf
{sql|
CREATE TABLE IF NOT EXISTS %s (
namespace VARCHAR(128) NOT NULL,
version INTEGER,
dirty BOOL NOT NULL,
PRIMARY KEY (namespace)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
|sql}
table)
;;
let create_table_if_not_exists ?ctx table =
Database.exec ?ctx (create_request table) ()
;;
let get = get
let get_all = get_all
let upsert_request table =
Caqti_request.exec
Caqti_type.(tup3 string int bool)
(Format.sprintf
{sql|
INSERT INTO %s (
namespace,
version,
dirty
) VALUES (
?,
?,
?
) ON DUPLICATE KEY UPDATE
version = VALUES(version),
dirty = VALUES(dirty)
|sql}
table)
;;
let upsert ?ctx table state =
Database.exec ?ctx (upsert_request table) (Migration.to_tuple state)
;;
end
module PostgreSql : Sig = struct
module Migration = Migration
let create_request table =
Caqti_request.exec
Caqti_type.unit
(Format.sprintf
{sql|
CREATE TABLE IF NOT EXISTS %s (
namespace VARCHAR(128) NOT NULL PRIMARY KEY,
version INTEGER,
dirty BOOL NOT NULL
);
|sql}
table)
;;
let create_table_if_not_exists ?ctx table =
Database.exec ?ctx (create_request table) ()
;;
let get = get
let get_all = get_all
let upsert_request table =
Caqti_request.exec
Caqti_type.(tup3 string int bool)
(Format.sprintf
{sql|
INSERT INTO %s (
namespace,
version,
dirty
) VALUES (
?,
?,
?
) ON CONFLICT (namespace)
DO UPDATE SET version = EXCLUDED.version,
dirty = EXCLUDED.dirty
|sql}
table)
;;
let upsert ?ctx table state =
Database.exec ?ctx (upsert_request table) (Migration.to_tuple state)
;;
end