17 lines
582 B
MySQL
17 lines
582 B
MySQL
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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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