barcode generator source code in c#.net STORING CUSTOMER ORDERS in C#.NET

Make Code 3/9 in C#.NET STORING CUSTOMER ORDERS

CHAPTER 12 STORING CUSTOMER ORDERS
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Implementing Tax and Shipping Charges
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As expected, you need to make several modifications to HatShop to enable the tax and shipping schemes outlined previously. You have two more database tables to add, tax and shipping, as well as modifications to make to the orders table. You ll need to add new database functions and make some modifications to existing ones. Some of the business tier classes need modifications to account for these changes, and the presentation tier must include a method for users to select a shipping method (the taxing scheme is selected automatically). So, let s get started.
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In this section, you ll add the new tables and modify the orders table and database functions.
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Exercise: Adding the Database Structures
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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 adds the shipping table to your hatshop database: -- Create shipping table CREATE TABLE shipping ( shipping_id SERIAL NOT NULL, shipping_type VARCHAR(100) NOT NULL, shipping_cost NUMERIC(10, 2) NOT NULL, shipping_region_id INTEGER NOT NULL, CONSTRAINT pk_shipping_id PRIMARY KEY (shipping_id), CONSTRAINT fk_shipping_region_id FOREIGN KEY (shipping_region_id) REFERENCES shipping_region (shipping_region_id) ON UPDATE RESTRICT ON DELETE RESTRICT ); 4. Use the query tool to execute this code, which populates the shipping table from your hatshop database: -- Populate shipping table INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(1, 'Next Day Delivery ($20)', 20.00, 2); INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(2, '3-4 Days ($10)', 10.00, 2); INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(3, '7 Days ($5)', 5.00, 2);
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CHAPTER 12 STORING CUSTOMER ORDERS
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INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(4, 'By air (7 days, $25)', 25.00, 3); INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(5, 'By sea (28 days, $10)', 10.00, 3); INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(6, 'By air (10 days, $35)', 35.00, 4); INSERT INTO shipping (shipping_id, shipping_type, shipping_cost, shipping_region_id) VALUES(7, 'By sea (28 days, $30)', 30.00, 4); 5. Use the query tool to execute this code, which adds the tax table to your hatshop database: -- Create tax table CREATE TABLE tax ( tax_id SERIAL NOT NULL, tax_type VARCHAR(100) NOT NULL, tax_percentage NUMERIC(10, 2) NOT NULL, CONSTRAINT pk_tax_id PRIMARY KEY (tax_id) ); 6. Use the query tool to execute this code, which populates the tax table from your hatshop database: -- Populate tax table INSERT INTO tax (tax_id, tax_type, tax_percentage) VALUES(1, 'Sales Tax at 8.5%', 8.50); INSERT INTO tax (tax_id, tax_type, tax_percentage) VALUES(2, 'No Tax', 0.00); 7. Execute this code, which adds the shipping_id column and a new constraint to the orders table from your hatshop database: -- Adding a new field named shipping_id to orders table ALTER TABLE orders ADD COLUMN shipping_id INTEGER; -- Adding a new foreign key constraint to orders table ALTER TABLE orders ADD CONSTRAINT fk_shipping_id FOREIGN KEY (shipping_id) REFERENCES shipping (shipping_id) ON UPDATE RESTRICT ON DELETE RESTRICT;
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CHAPTER 12 STORING CUSTOMER ORDERS
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8. Use the query tool to execute this code, which adds the tax_id column and a new constraint to the orders table from your hatshop database: -- Adding a new field named tax_id to orders table ALTER TABLE orders ADD COLUMN tax_id INTEGER; -- Adding a new foreign key constraint to orders table ALTER TABLE orders ADD CONSTRAINT fk_tax_id FOREIGN KEY (tax_id) REFERENCES tax (tax_id) ON UPDATE RESTRICT ON DELETE RESTRICT; 9. Delete the current shopping_cart_create_order function, and create a new one that takes into consideration the new changes made to the orders table: -- Drop shopping_cart_create_order function DROP FUNCTION shopping_cart_create_order(CHAR(32), INTEGER); -- Create shopping_cart_create_order function CREATE FUNCTION shopping_cart_create_order(CHAR(32), INTEGER, INTEGER, INTEGER) RETURNS INTEGER LANGUAGE plpgsql AS $$ DECLARE inCartId ALIAS FOR $1; inCustomerId ALIAS FOR $2; inShippingId ALIAS FOR $3; inTaxId ALIAS FOR $4; outOrderId INTEGER; cartItem cart_product; orderTotalAmount NUMERIC(10, 2); BEGIN -- Insert a new record into orders INSERT INTO orders (created_on, customer_id, shipping_id, tax_id) VALUES (NOW(), inCustomerId, inShippingId, inTaxId); -- Obtain the new Order ID SELECT INTO outOrderId currval('orders_order_id_seq'); orderTotalAmount := 0; -- Insert order details in order_detail table FOR cartItem IN SELECT p.product_id, p.name, COALESCE(NULLIF(p.discounted_price, 0), p.price) AS price, sc.quantity, COALESCE(NULLIF(p.discounted_price, 0), p.price) * sc.quantity AS subtotal FROM shopping_cart sc INNER JOIN product p ON sc.product_id = p.product_id WHERE sc.cart_id = inCartId AND sc.buy_now
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