generate code 39 barcode in c# CREATING THE PRODUCT CATALOG: PART II in Visual C#

Maker Code39 in Visual C# CREATING THE PRODUCT CATALOG: PART II

CHAPTER 4 CREATING THE PRODUCT CATALOG: PART II
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4. Execute the query by selecting Query Execute, or by pressing F5. The results can be seen in Figure 4-6.
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Figure 4-6. Adding sample categories 5. Now, try to break the database integrity by adding a category to a nonexistent department (for example, set the DepartmentID to 500). Try executing this SQL command using pgAdmin III: INSERT INTO category (department_id, name, description) VALUES (500, 'New category', 'Executing this command should throw an error.'); 6. If everything goes well, the database should deny adding the new record, throwing this error you can see in Figure 4-7.
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Figure 4-7. The foreign key in action
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CHAPTER 4 CREATING THE PRODUCT CATALOG: PART II
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How It Works: Populating the categories Table
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Adding data to your table should be a trivial task, given that you know the data that needs to be inserted. As pointed out earlier, you can find the SQL scripts in the book s code in the Source Code/Download section of the Apress web site (http://www.apress.com). Note how we escaped the special characters in the category descriptions, such as the single quotes, which need to be doubled, so PostgreSQL will know to interpret that as a quote to be added to the description, instead of a string termination character. When manually adding values to fields whose values would otherwise be generated by sequences, you need to manually update the sequence because the sequences are separate database objects that aren t automatically updated if they aren t used to generate data. If you don t change the sequence, it would probably end up generating values that have already been added to the database, and some or all of your INSERT commands would end up throwing errors.
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Adding Products
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You ll now go through the same steps as earlier, but this time, you ll create a bit more complicated table: product. The product table has the fields shown in Table 4-3. Table 4-3. Designing the product Table
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Field Name
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product_id name description price discounted_price image
Data Type
SERIAL VARCHAR(50) VARCHAR(1000) NUMERIC(10,2) NUMERIC(10,2) VARCHAR(150)
Description
An integer that represents the unique ID for the category. It is the primary key of the table. Stores the product name. It doesn t allow NULLs. Stores the category description. It allows NULLs. Stores the product price. Stores the discounted product price. Will store 0.00 in case the product doesn t have a current discount price. Stores the name of the product s picture file (or eventually the complete path), which gets displayed on the product details page. You could keep the picture directly in the table, but in most cases, it s much more efficient to store the picture files in the file system and have only their names stored into the database. If you have a high-traffic web site, you might even want to have the image files placed in a separate physical location (for example, another hard disk) to increase site performance. Stores the name of the product s thumbnail picture. This image gets displayed in product lists when browsing the catalog. Stores a value specifying in what areas of the catalog this product should be displayed. The possible values are 0 (default; the product shows only in the page of the category it s a part of), 1 (the product is also featured on the front catalog page), 2 (the product is also
thumbnail display
VARCHAR(150) INTEGER
CHAPTER 4 CREATING THE PRODUCT CATALOG: PART II
Table 4-3. Continued
Field Name
Data Type
Description
featured in the departments it s a part of), and 3 (the product is also featured on both the front page and on the department page). With the help of this field, the site administrators can highlight a set of products that will be of particular interest to visitors at a specific time. For example, before Halloween, you will want the Halloween hats to appear prominently on the front page of the site. Also if you want to promote products that have a discounted price, this feature is just what you need.
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