44 lines
1.1 KiB
MySQL
44 lines
1.1 KiB
MySQL
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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 __DO_NOT_MANIPULATE__trigger_memory (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 __DO_NOT_MANIPULATE__trigger_memory
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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 __DO_NOT_MANIPULATE__trigger_memory
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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 __DO_NOT_MANIPULATE__trigger_memory WHERE d = 'from_' || NEW.credId;
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END;
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