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Adding Product Recommendations
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Make sure you understand the data tier logic explained earlier because you ll implement it in the catalog_get_recommendations database function. The only significant difference from the queries shown earlier is that you ll also ask for the product description, which will be truncated at a specified number of characters. The catalog_get_recommendations database function is called when displaying what products were ordered together with the selected product. Follow the steps in the next exercise to add the catalog_get_recommendations function to the hatshop database.
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Exercise: Adding the catalog_get_recommendations Function
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1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the product_recommendation type and the catalog_get_recommendations function in your hatshop database: -- Create product_recommendation type CREATE TYPE product_recommendation AS ( product_id INTEGER, name VARCHAR(50), description VARCHAR(1000) ); -- Create catalog_get_recommend+ations function CREATE FUNCTION catalog_get_recommendations(INTEGER, INTEGER) RETURNS SETOF product_recommendation LANGUAGE plpgsql AS $$ DECLARE inProductId ALIAS FOR $1; inShortProductDescriptionLength ALIAS FOR $2; outProductRecommendationRow product_recommendation; BEGIN FOR outProductRecommendationRow IN SELECT product_id, name, description FROM product WHERE product_id IN (SELECT od2.product_id FROM order_detail od1 JOIN order_detail od2 ON od1.order_id = od2.order_id WHERE od1.product_id = inProductId AND od2.product_id != inProductId GROUP BY od2.product_id ORDER BY COUNT(od2.product_id) DESC LIMIT 5) LOOP
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IF char_length(outProductRecommendationRow.description) > inShortProductDescriptionLength THEN outProductRecommendationRow.description := substring(outProductRecommendationRow.description, 1, inShortProductDescriptionLength) || '...'; END IF; RETURN NEXT outProductRecommendationRow; END LOOP; END; $$;
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An Alternate Solution Using Subqueries
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Because SQL is so versatile, catalog_get_recommendations can be written in a variety of ways. In our case, one popular alternative to using table joins is using subqueries. Here s a version of catalog_get_recommendations that uses subqueries instead of joins. The commented code is self-explanatory: -- Create catalog_get_recommendations function CREATE OR REPLACE FUNCTION catalog_get_recommendations(INTEGER, INTEGER) RETURNS SETOF product_recommendation LANGUAGE plpgsql AS $$ DECLARE inProductId ALIAS FOR $1; inShortProductDescriptionLength ALIAS FOR $2; outProductRecommendationRow product_recommendation; BEGIN FOR outProductRecommendationRow IN -- Returns the product recommendations SELECT product_id, name, description FROM product WHERE product_id IN (-- Returns the products that were ordered -- together with inProductId SELECT product_id FROM order_detail WHERE order_id IN (-- Returns the orders that contain inProductId SELECT DISTINCT order_id FROM order_detail WHERE product_id = inProductId LIMIT 5) -- Must not include products that already -- exist in the visitor's cart AND product_id != inProductId -- Group the product_id so we can calculate the rank GROUP BY product_id
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-- Order descending by rank ORDER BY COUNT(product_id) DESC LIMIT 5) LOOP IF char_length(outProductRecommendationRow.description) > inShortProductDescriptionLength THEN outProductRecommendationRow.description := substring(outProductRecommendationRow.description, 1, inShortProductDescriptionLength) || '...'; END IF; RETURN NEXT outProductRecommendationRow; END LOOP; END; $$;
Adding Shopping Cart Recommendations
The logic for showing shopping cart recommendations is very similar to what you did earlier, except now you need to take into account all products that exist in the shopping cart, instead of a single product. Follow the steps in the next exercise to add the shopping_cart_get_ recommendations function to the hatshop database.
Exercise: Adding the shopping_cart_get_recommendations Function
1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the shopping_cart_get_recommendations function in your hatshop database: -- Create shopping_cart_get_recommendations function CREATE FUNCTION shopping_cart_get_recommendations(CHAR(32), INTEGER) RETURNS SETOF product_recommendation LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; inShortProductDescriptionLength ALIAS FOR $2; outProductRecommendationRow product_recommendation; BEGIN FOR outProductRecommendationRow IN -- Returns the product recommendations SELECT product_id, name, description FROM product WHERE product_id IN (-- Returns the products that exist in a list of orders SELECT od1.product_id FROM order_detail od1 JOIN order_detail od2
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ON od1.order_id = od2.order_id shopping_cart ON od2.product_id = shopping_cart.product_id WHERE shopping_cart.cart_id = inCartId -- Must not include products that already exist -- in the visitor's cart AND od1.product_id NOT IN (-- Returns the products in the specified -- shopping cart SELECT product_id FROM shopping_cart WHERE cart_id = inCartId) -- Group the product_id so we can calculate the rank GROUP BY od1.product_id -- Order descending by rank ORDER BY COUNT(od1.product_id) DESC LIMIT 5) JOIN LOOP IF char_length(outProductRecommendationRow.description) > inShortProductDescriptionLength THEN outProductRecommendationRow.description := substring(outProductRecommendationRow.description, 1, inShortProductDescriptionLength) || '...'; END IF; RETURN NEXT outProductRecommendationRow; END LOOP; END; $$; The alternate version of this function, which uses subqueries instead of table joins, looks like this: -- Create shopping_cart_get_recommendations function CREATE OR REPLACE FUNCTION shopping_cart_get_recommendations(CHAR(32), INTEGER) RETURNS SETOF product_recommendation LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; inShortProductDescriptionLength ALIAS FOR $2; outProductRecommendationRow product_recommendation; BEGIN FOR outProductRecommendationRow IN -- Returns the product recommendations SELECT product_id, name, description FROM product WHERE product_id IN (-- Returns the products that exist in a list of orders SELECT product_id FROM order_detail WHERE order_id IN
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