383 lines
12 KiB
SQL
383 lines
12 KiB
SQL
CREATE TABLE Account (
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ID PRIMARY KEY NOT NULL,
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type NOT NULL,
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altId NOT NULL, -- e.g. when type "member", no. in external member table
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IBAN -- target account for returned payments (set '' to enable
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-- outgoing bank transfers to commercial partners from that account).
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);
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CREATE TABLE Debit (
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billId PRIMARY KEY NOT NULL,
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debtor NOT NULL, -- Account charged
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targetCredit INTEGER, -- record id in Credit table to pay into.
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-- just understand it as virtual payment
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-- NULL when debit is a bank transfer from the club account
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date DATE NOT NULL,
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purpose NOT NULL, -- description of receipt
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value INTEGER NOT NULL, -- Euro-Cent
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paid INTEGER DEFAULT 0, -- Euro-Cent, set and changed automatically (Cache)
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FOREIGN KEY (debtor) REFERENCES Account(ID),
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FOREIGN KEY (targetCredit) REFERENCES Credit(credId)
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);
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CREATE TABLE Credit (
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credId INTEGER PRIMARY KEY NOT NULL,
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account NOT NULL, -- Account des Begünstigten
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date DATE NOT NULL,
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purpose NOT NULL, -- as originally indicated in statement of bank account
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value INTEGER NOT NULL, -- Euro-Cent. Caution, two distinct cases need to be considered:
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-- Either deposit by bank transfer (>0) or target of internal payments (=0)
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spent INTEGER DEFAULT 0, -- Euro-Cent, set and changed automatically (Cache)
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-- for later traceability, necessary when revoking transfers
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FOREIGN KEY (account) REFERENCES Account(ID)
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);
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-- Which credit pays/paid down which debt is recorded traceably so as to clarify any case of reminder,
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-- without ambuiguity about, which debt is actually due yet, or to clarify which transfer is used for
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-- which debts. The user specifies which credit is intended for which debt, in accordance with the
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-- purpose if any is indicated in a received bank transfer. Following triggers verify this relation
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-- and mark a debit as paid and/or a credit as paid.
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-- Debits to which applies value > paid are meant to be suggested for assignment to newly inserted
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-- credit records without indicated purpose. Likewise, credits without indicated purpose to which
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-- applies value > spent are candidates for payment of newly inserted debts.
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CREATE TABLE Transfer (
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timestamp DATE DEFAULT CURRENT_TIMESTAMP,
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billId INTEGER NOT NULL,
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credId INTEGER NOT NULL,
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amount INTEGER, -- for later traceability, necessary when revoking transfers
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FOREIGN KEY (billId) REFERENCES Debit(billId),
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FOREIGN KEY (credId) REFERENCES Credit(credId),
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UNIQUE (billId, credId)
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);
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CREATE TABLE IF NOT EXISTS _temp (d, c, m);
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CREATE TRIGGER balanceTransfer
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AFTER INSERT ON Transfer
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BEGIN
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SELECT RAISE(FAIL, "It is not the debtor who is set to pay")
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WHERE (SELECT debtor FROM Debit WHERE billId=NEW.billId)
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!= (SELECT account FROM Credit WHERE credId=NEW.credId)
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;
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SELECT RAISE(FAIL, "Target of a debit cannot be an incoming payment")
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FROM Credit c
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JOIN Debit d ON c.credId = d.targetCredit
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WHERE c.credId = NEW.credId
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AND c.value > 0
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GROUP BY c.credId
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HAVING count(d.billId) == 0
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;
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INSERT INTO _temp
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SELECT remainingDebt, remainingCredit, min(remainingDebt,remainingCredit)
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FROM (SELECT
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(SELECT value - paid FROM Debit WHERE billId=NEW.billId) AS remainingDebt,
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(SELECT value - spent FROM Credit WHERE credId=NEW.credId) AS remainingCredit
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)
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;
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UPDATE Debit
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SET paid = paid + CASE
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WHEN (SELECT d FROM _temp) <= 0
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THEN RAISE(FAIL, "Debt settled")
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ELSE
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(SELECT m FROM _temp)
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END
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WHERE billId=NEW.billId;
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UPDATE Credit
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SET spent = spent + CASE
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WHEN (SELECT c FROM _temp) <= 0
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THEN RAISE(FAIL, "Credit spent")
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ELSE IFNULL(
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(SELECT m FROM _temp),
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RAISE(FAIL,"Oops, lost _temp record before increasing spent")
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)
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END
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WHERE credId=NEW.credId;
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UPDATE Transfer
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SET amount = (SELECT m FROM _temp)
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WHERE billId=NEW.billId AND credId=NEW.credId
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;
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UPDATE Credit
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SET value = value + IFNULL(
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(SELECT m FROM _temp),
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RAISE(FAIL, "Oops, lost _temp record before increasing value")
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)
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WHERE credId = (
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SELECT targetCredit
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FROM Debit
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WHERE billId=NEW.billId
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);
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DELETE FROM _temp;
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END;
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CREATE TRIGGER revokeTransfer
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BEFORE DELETE ON Transfer
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BEGIN
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INSERT INTO _temp VALUES (null,null,OLD.amount);
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UPDATE Debit
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SET paid = paid - OLD.amount
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WHERE billId=OLD.billId
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;
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UPDATE Credit
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SET value = value - OLD.amount
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WHERE credId = (
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SELECT targetCredit
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FROM Debit
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WHERE billId=OLD.billId
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);
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UPDATE Credit
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SET spent = spent - OLD.amount
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WHERE credId = OLD.credId;
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DELETE FROM _temp;
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END;
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CREATE TRIGGER enforceImmutableTransfer
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BEFORE UPDATE ON Transfer
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WHEN OLD.amount IS NOT NULL
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BEGIN
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SELECT RAISE(FAIL, "Transfer cannot be updated, but needs to be replaced to make triggers run");
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END;
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CREATE TRIGGER enforceiZeroPaidAtStart
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BEFORE INSERT ON Debit
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BEGIN
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SELECT RAISE(FAIL, "Debt must be initially unpaid")
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WHERE NEW.paid <> 0;
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END;
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-- Prevent modification of paid value outside triggers which must adjust it exclusively
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-- when new transfer records are inserted
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CREATE TRIGGER enforceDebtImmutableOutsideTrigger
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BEFORE UPDATE OF paid ON Debit
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WHEN NOT EXISTS (SELECT * FROM Transfer t WHERE NEW.billId=t.billId AND amount IS NULL)
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BEGIN
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SELECT RAISE(FAIL, "paid is set and adjusted automatically according to added Transfer records")
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WHERE (NEW.paid + IFNULL((SELECT m FROM _temp WHERE c IS NULL AND d IS NULL),0) ) <> OLD.paid;
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END;
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-- When a transfer is revoked, the targetCredit of the associated bill is reduced. Hence we must
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-- check if we can still have paid the debts linked to this transfer in an "is paid from" relation,
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-- otherwise we have to revoke these transfers as well.
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CREATE TRIGGER rebalanceReducedCredit
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AFTER UPDATE OF value ON Credit
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WHEN NEW.value < OLD.spent
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BEGIN
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REPLACE INTO _temp (d, m)
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SELECT
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'from_' || NEW.credId,
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billId
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FROM Transfer
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WHERE credId = NEW.credId
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ORDER BY timestamp DESC
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LIMIT 1
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;
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DELETE
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FROM Transfer
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WHERE credId = NEW.credId
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AND billId IN (
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SELECT billId
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FROM _temp
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WHERE c = 'from_' || NEW.credId
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)
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;
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INSERT INTO Transfer (credId, billId)
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SELECT NEW.credId, m
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FROM _temp
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WHERE d = 'from_' || NEW.credId
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AND NEW.value > (
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SELECT spent
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FROM Credit
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WHERE credId = NEW.credId
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)
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;
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DELETE FROM _temp WHERE d = 'from_' || NEW.credId;
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END;
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-- When we enter a transfer, the targetCredit of the associated bill might already be the credId
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-- of a transfer for other dues itself. We can update (replace) the transfer for an unfullfilled one.
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-- That way, a transfer may issue recursively chained transfers.
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CREATE TRIGGER rebalanceIncreasedCredit
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AFTER UPDATE OF value ON Credit
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WHEN NEW.value > OLD.spent
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BEGIN
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REPLACE INTO Transfer (credId, billId)
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SELECT OLD.credId, t.billId
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FROM Transfer t
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JOIN CurrentArrears ca ON t.billId = ca.billId
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WHERE OLD.credId = t.credId
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;
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END;
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CREATE TRIGGER enforceFixedDebits
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BEFORE UPDATE OF value ON Debit
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WHEN EXISTS (SELECT * FROM Transfer WHERE billId=NEW.billId)
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BEGIN
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SELECT RAISE(FAIL, "Debt is involved in transfers to revoke at first");
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END;
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CREATE TRIGGER enforceZeroSpentAtStart
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BEFORE INSERT ON Credit
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BEGIN
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SELECT RAISE(FAIL, "credit must be initially unused")
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WHERE NEW.spent != 0;
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END;
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-- Prevent modification of spent value outside triggers which must adjust it exclusively
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-- when new transfer records are inserted
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CREATE TRIGGER enforceSpentImmutableOutsideTrigger
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BEFORE UPDATE OF spent ON Credit
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WHEN NOT EXISTS (SELECT * FROM Transfer t WHERE NEW.credId=t.credId AND amount IS NULL)
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BEGIN
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SELECT RAISE(FAIL, "spent is set and adjusted automatically according to added Transfer records")
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WHERE (NEW.spent + IFNULL((SELECT m FROM _temp WHERE c IS NULL AND d IS NULL),0) ) <> OLD.spent;
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END;
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-- CREATE TRIGGER enforceFixedCredit
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-- BEFORE UPDATE OF value ON Credit
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-- BEGIN
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-- SELECT RAISE(FAIL, "Credit involved in transactions to revoke at first")
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-- WHERE EXISTS (SELECT * FROM Transfer WHERE credId=NEW.credId);
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-- END;
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CREATE TRIGGER checkIBANatTransfer
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BEFORE INSERT ON Debit
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WHEN NEW.targetCredit IS NULL
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BEGIN
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SELECT RAISE(FAIL, "IBAN used does not match IBAN currently stored in account record")
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FROM (
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SELECT instr(NEW.purpose, IBAN) AS fnd
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FROM Account
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WHERE ID=NEW.debtor
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) AS matchingIBAN
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WHERE fnd IS NULL OR fnd = 0;
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END;
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CREATE VIEW CurrentArrears AS
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SELECT billId,
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debtor,
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targetCredit,
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purpose,
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date,
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value - paid AS difference
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FROM Debit
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WHERE value != paid
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;
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CREATE VIEW AvailableCredits AS
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SELECT credId, account, purpose, date,
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value - spent AS difference
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FROM Credit
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WHERE value != spent
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;
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-- Log of internal transfers
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CREATE VIEW History AS
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-- internal transfers with account as source
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SELECT DATE(timestamp) AS date,
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d.purpose AS purpose,
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d.debtor AS account,
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NULL AS credit,
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t.amount AS debit,
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c.account AS contra,
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d.billId AS billId
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FROM Transfer t
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LEFT JOIN Debit AS d ON d.billId = t.billId
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LEFT JOIN Credit AS c ON c.credId = d.targetCredit
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-- internal transfers with account as target
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UNION
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SELECT DATE(timestamp) AS date,
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d.purpose AS purpose,
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c.account AS account,
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t.amount AS credit,
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NULL AS debit,
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d.debtor AS contra,
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d.billId AS billId
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FROM Transfer t
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LEFT JOIN Debit AS d ON d.billId = t.billId
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LEFT JOIN Credit AS c ON c.credId = d.targetCredit
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ORDER BY date ASC
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;
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CREATE VIEW Balance AS
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SELECT Account.ID AS ID,
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IFNULL(ac.allCredits,0) AS available,
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IFNULL(hi.credit,0) AS earned,
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IFNULL(hi.debit,0) AS spent,
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IFNULL(pr.allPromises, 0) AS promised,
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IFNULL(ca.allArrears, 0) AS arrears,
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even.until AS even_until
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FROM Account
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LEFT OUTER JOIN (
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SELECT debtor, sum(difference) AS allArrears
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FROM CurrentArrears
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GROUP BY debtor
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) AS ca ON Account.ID=ca.debtor
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LEFT OUTER JOIN (
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SELECT account, sum(difference) AS allCredits
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FROM AvailableCredits
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GROUP BY account
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) AS ac ON Account.ID=ac.account
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LEFT OUTER JOIN (
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SELECT a.ID AS ID, sum(difference) AS allPromises
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FROM CurrentArrears ca
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JOIN Credit c ON ca.targetCredit = c.credId
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JOIN Account a ON a.ID = c.account
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GROUP BY a.ID
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) AS pr ON Account.ID=pr.ID
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LEFT OUTER JOIN (
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SELECT account,
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sum(credit) AS credit,
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sum(debit) AS debit
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FROM History
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GROUP BY account
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) AS hi ON Account.ID=hi.account
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LEFT OUTER JOIN (
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SELECT d.debtor AS account,
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max(d.date) AS until
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FROM Debit d
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LEFT OUTER JOIN CurrentArrears ca ON d.debtor = ca.debtor
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GROUP BY d.debtor, ca.debtor
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HAVING d.date <= IFNULL( min(ca.date), d.date )
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) AS even ON Account.ID=even.account
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;
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CREATE VIEW ReconstructedBankStatement AS
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SELECT c.date AS date,
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c.purpose AS purpose,
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account,
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c.value AS credit,
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NULL AS debit
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FROM Credit AS c
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LEFT OUTER JOIN Debit AS d ON c.credId=d.targetCredit
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GROUP BY c.credId
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HAVING count(d.billId) == 0 -- exclude internal transfers
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UNION
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SELECT date,
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purpose,
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debtor AS account,
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NULL AS credit,
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value AS debit
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FROM Debit
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WHERE targetCredit IS NULL -- exclude internal transfers
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ORDER BY date ASC
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;
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