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109 lines
3.1 KiB
SQL
109 lines
3.1 KiB
SQL
-- Remove QU conversions which are already defined by the products qu_factor_purchase_to_stock
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DELETE FROM quantity_unit_conversions
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WHERE id IN (
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SELECT quc.id
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FROM quantity_unit_conversions quc
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JOIN products p
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ON quc.product_id = p.id
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WHERE (p.qu_id_purchase = quc.to_qu_id AND p.qu_id_stock = quc.from_qu_id)
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OR (p.qu_id_purchase = quc.from_qu_id AND p.qu_id_stock = quc.to_qu_id)
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);
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DROP TRIGGER quantity_unit_conversions_custom_unique_constraint_INS;
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CREATE TRIGGER qu_conversions_custom_constraint_INS BEFORE INSERT ON quantity_unit_conversions
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BEGIN
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/*
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Necessary because unique constraints don't include NULL values in SQLite,
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and also because the constraint should include the products default conversion factor
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*/
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SELECT CASE WHEN((
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SELECT 1
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FROM quantity_unit_conversions
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WHERE from_qu_id = NEW.from_qu_id
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AND to_qu_id = NEW.to_qu_id
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AND IFNULL(product_id, 0) = IFNULL(NEW.product_id, 0)
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UNION
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SELECT 1
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FROM products
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WHERE id = NEW.product_id
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AND qu_id_purchase = NEW.from_qu_id
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AND qu_id_stock = NEW.to_qu_id
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UNION
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SELECT 1
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FROM products
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WHERE id = NEW.product_id
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AND qu_id_purchase = NEW.to_qu_id
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AND qu_id_stock = NEW.from_qu_id
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)
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NOTNULL) THEN RAISE(ABORT, "QU conversion already exists") END;
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END;
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DROP TRIGGER quantity_unit_conversions_custom_unique_constraint_UPD;
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CREATE TRIGGER qu_conversions_custom_constraint_UPD BEFORE UPDATE ON quantity_unit_conversions
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BEGIN
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/* This contains practically the same logic as the trigger qu_conversions_custom_constraint_INS */
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/*
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Necessary because unique constraints don't include NULL values in SQLite,
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and also because the constraint should include the products default conversion factor
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*/
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SELECT CASE WHEN((
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SELECT 1
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FROM quantity_unit_conversions
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WHERE from_qu_id = NEW.from_qu_id
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AND to_qu_id = NEW.to_qu_id
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AND IFNULL(product_id, 0) = IFNULL(NEW.product_id, 0)
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AND id != NEW.id
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UNION
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SELECT 1
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FROM products
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WHERE id = NEW.product_id
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AND qu_id_purchase = NEW.from_qu_id
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AND qu_id_stock = NEW.to_qu_id
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UNION
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SELECT 1
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FROM products
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WHERE id = NEW.product_id
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AND qu_id_purchase = NEW.to_qu_id
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AND qu_id_stock = NEW.from_qu_id
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)
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NOTNULL) THEN RAISE(ABORT, "QU conversion already exists") END;
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END;
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CREATE TRIGGER qu_conversions_inverse_INS AFTER INSERT ON quantity_unit_conversions
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BEGIN
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/*
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Create the inverse QU conversion
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*/
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INSERT OR REPLACE INTO quantity_unit_conversions
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(from_qu_id, to_qu_id, factor, product_id)
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VALUES
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(NEW.to_qu_id, NEW.from_qu_id, 1 / IFNULL(NEW.factor, 1), NEW.product_id);
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END;
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CREATE TRIGGER qu_conversions_inverse_UPD AFTER UPDATE ON quantity_unit_conversions
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BEGIN
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/*
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Update the inverse QU conversion
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*/
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UPDATE quantity_unit_conversions
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SET factor = 1 / IFNULL(NEW.factor, 1)
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WHERE from_qu_id = NEW.to_qu_id
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AND to_qu_id = NEW.from_qu_id
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AND IFNULL(product_id, -1) = IFNULL(NEW.product_id, -1);
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END;
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CREATE TRIGGER qu_conversions_inverse_DEL AFTER DELETE ON quantity_unit_conversions
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BEGIN
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/*
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Delete the inverse QU conversion
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*/
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DELETE FROM quantity_unit_conversions
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WHERE from_qu_id = OLD.to_qu_id
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AND to_qu_id = OLD.from_qu_id
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AND IFNULL(product_id, -1) = IFNULL(OLD.product_id, -1);
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END;
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