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|
type pool = ((module Rapper_helper.CONNECTION), Caqti_error.t) Caqti_eio.Pool.t
module Q = struct
let transaction =
[%rapper
execute
{sql|
INSERT INTO transactions (client_id, value, type, description)
VALUES (%int{client_id}, %int{value}, %Operation.TransactionType{transaction_type}, %string{description})
|sql}]
;;
let debit =
[%rapper
execute
{sql|
UPDATE balances SET value = value - %int{value} WHERE client_id = %int{client_id}
|sql}]
;;
let credit =
[%rapper
execute
{sql|
UPDATE balances SET value = value + %int{value} WHERE client_id = %int{client_id}
|sql}]
;;
let client =
let open Client in
[%rapper
get_opt
{sql|
SELECT @int{id}, @int{mov_limit} FROM clients WHERE id = %int{id}
|sql}
record_out]
;;
let balance =
[%rapper
get_opt
{sql|
SELECT @int{value}, @ptime{now()} as time FROM balances WHERE client_id = %int{client_id}
|sql}]
;;
end
let ( let* ) = Result.bind
let execute_operation ~client_id ~(op : Operation.t) conn =
match op with
| Transaction { value; description; transaction_type } ->
let* () = Q.transaction ~client_id ~value ~description conn ~transaction_type in
(match transaction_type with
| Credit -> Q.credit ~value ~client_id conn
| Debit -> Q.debit ~value ~client_id conn)
| _ -> failwith "TODO"
;;
let find_client id conn = Q.client ~id conn
let balance client_id conn = Q.balance ~client_id conn
|
