33 lines
1.9 KiB
PL/PgSQL
33 lines
1.9 KiB
PL/PgSQL
-- 为套餐使用记录增加购买时不可变计时条款快照；空值和零值保留为历史未快照标记。
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ALTER TABLE tb_package_usage
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ADD COLUMN expiry_base_snapshot VARCHAR(30) NOT NULL DEFAULT '',
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ADD COLUMN calendar_type_snapshot VARCHAR(20) NOT NULL DEFAULT '',
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ADD COLUMN duration_months_snapshot INTEGER NOT NULL DEFAULT 0,
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ADD COLUMN duration_days_snapshot INTEGER NOT NULL DEFAULT 0;
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COMMENT ON COLUMN tb_package_usage.expiry_base_snapshot IS '购买时生效条件快照，空字符串表示历史未快照';
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COMMENT ON COLUMN tb_package_usage.calendar_type_snapshot IS '购买时周期类型快照，空字符串表示历史未快照';
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COMMENT ON COLUMN tb_package_usage.duration_months_snapshot IS '购买时月数快照，0表示未使用或历史未快照';
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COMMENT ON COLUMN tb_package_usage.duration_days_snapshot IS '购买时天数快照，0表示未使用或历史未快照';
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-- 触发器只校验新记录及快照字段变更，历史空快照仍可更新状态等非快照字段。
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CREATE OR REPLACE FUNCTION validate_package_usage_terms_snapshot()
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RETURNS TRIGGER AS $$
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BEGIN
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IF NEW.expiry_base_snapshot NOT IN ('from_purchase', 'from_activation')
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OR NOT (
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(NEW.calendar_type_snapshot = 'natural_month' AND NEW.duration_months_snapshot > 0 AND NEW.duration_days_snapshot = 0)
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OR (NEW.calendar_type_snapshot = 'by_day' AND NEW.duration_days_snapshot > 0 AND NEW.duration_months_snapshot = 0)
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) THEN
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RAISE EXCEPTION '套餐使用记录计时快照不完整或无效';
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER trg_validate_package_usage_terms_snapshot
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BEFORE INSERT OR UPDATE OF expiry_base_snapshot, calendar_type_snapshot, duration_months_snapshot, duration_days_snapshot
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ON tb_package_usage
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FOR EACH ROW
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EXECUTE FUNCTION validate_package_usage_terms_snapshot();
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