13 lines
579 B
MySQL
13 lines
579 B
MySQL
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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(
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(SELECT m FROM __DO_NOT_MANIPULATE__trigger_memory WHERE c IS NULL AND d IS NULL), 0
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) ) <> OLD.spent;
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END;
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