68 lines
1.6 KiB
Scheme
68 lines
1.6 KiB
Scheme
;;
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;; bar-db.scm
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;;
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;; Bar database queries.
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;;
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;; ISC License
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;;
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;; Copyright 2023-2025 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit bar-db))
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(module
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bar-db
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(
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bar-db-init!
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bd-barcode-lookup
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)
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(import scheme
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(chicken base)
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postgresql
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sql-null)
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(define bd-conn (make-parameter #f))
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(define (bar-db-init! name host user pass)
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(bd-conn
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(connect
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`((dbname . ,name)
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,@(if host
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`((host . ,host))
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'())
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,@(if user
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`((user . ,user)
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(password . ,pass))
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'())))))
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(define (sql-null->symbol v)
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(if (sql-null? v)
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'null
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v))
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(define (bd-barcode-lookup bc)
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(sql-null->symbol
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(car
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(row-values
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(query
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(bd-conn)
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"select sum(amount*case side when 'credit' then -1 else 1 end) amt from transaction_splits where account=(select account from barcodes where barcode=$1)"
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bc)))))
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)
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