how to print barcode in c# net EMBEDDED MYSQL in Font

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CHAPTER 6 EMBEDDED MYSQL
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Figure 6-3. Book Vending Machine customer interface
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Figure 6-4. Resulting Product Depleted view of the customer interface Figure 6-5 shows a sample of the details for one of the books.
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CHAPTER 6 EMBEDDED MYSQL
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Figure 6-5. Book details interface A vending machine wouldn t be very useful if there wasn t any way of replenishing the product. The BVM provides this via an administration interface. When the vendor needs to replenish the books or change the details to match a different set of books, the vendor opens the machine and closes the embedded application (this feature would have to be added to the example). The vendor would then restart the application providing the administrator switch on the command line like the one shown here: C:\>Books BookVendingMachine -admin The administration interface allows the vendor to enter an ad hoc query and execute it. Figure 6-6 shows the administration interface. The example shows a typical update operation to reset the quantity of the products. This interface allows the vendor to enter any query she needs to reset the data for the embedded application.
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CHAPTER 6 EMBEDDED MYSQL
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Figure 6-6. Administration interface
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The Data and Database
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The data for this example was created on a stand-alone MySQL server and copied to the embedded MySQL directory. When I created this application, I designed the data structures and the database to hold the data first. This is always a good idea.
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Note Some developers may disagree, believing it is better to start with the user interface design and allow the data requirements to evolve. Neither practice is better than the other. The important point is the data must be a focus of your design.
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Most of your projects will come with either requirements for the data or actual data in existing repositories. For new applications like this example, you should always design the database by designing the tables in such a way to represent the items and the relationships between them. This is usually a single step in a small project, but may be an iterative process where you use the initial tables and relationships as input to the design and planning of the user interfaces using UML drawings and modeling techniques. Changes to the database (the organization of the data) are often discovered during the later steps, which you then use as the starting point for going through the process again. The data for this example consists of a short list of descriptive fields about the books in the machine. This includes the title, author, price, and description. I added the ISBN to use as a key for the table (since it is unique by definition and used by the publishing industry as a primary means of identifying the book). I also added some other fields that I would want to see before I decide to purchase a book. These include publication date and number of pages. I also needed to store a thumbnail image. (I chose an external method where I stored the path and filename to the file and read it from the file system. I could have used a binary large object (BLOB) to store the
CHAPTER 6 EMBEDDED MYSQL
thumbnail, but this is easier although admittedly error prone.) Lastly, I projected what I would need to run the user interface and decided to add a field to record the slot number where the book is located and dispensed and a field to measure the quantity on hand. I named the table books and placed it in a database named bvm. The CREATE SQL statement for the table is shown here. Listing 6-11 shows the layout of the table using the EXPLAIN command. CREATE DATABASE BVM; CREATE TABLE Books (ISBN varchar(15) NOT NULL, Title varchar(125) NOT NULL, Authors varchar(100) NOT NULL, Price float NOT NULL, Pages int NOT NULL, PubDate date NOT NULL, Quantity int DEFAULT 0, Slot int NOT NULL, Thumbnail varchar(100) NOT NULL, Description text NOT NULL); Listing 6-11. Table Structure mysql> explain Books; +-------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+--------------+------+-----+---------+-------+ | ISBN | varchar(15) | NO | | | | | Title | varchar(125) | NO | | | | | Authors | varchar(100) | NO | | | | | Price | float | NO | | | | | Pages | int(11) | NO | | | | | PubDate | date | NO | | | | | Quantity | int(11) | YES | | 0 | | | Slot | int(11) | NO | | | | | Thumbnail | varchar(100) | NO | | | | | Description | text | NO | | | | +-------------+--------------+------+-----+---------+-------+ 10 rows in set (0.08 sec) To manage the thumbnail images, I chose to store the thumbnail filename in the thumbnail field and use a system-level option for the path. One way to do this is to create a commandline switch. Another is to place it in the MySQL configuration file and read it from there. You can also read it from the database. I chose to use a database table named settings that contains only two fields; FieldName, which stores the name of the option (e.g., "ImagePath"), and Value, which store its value (e.g., "c:\images\mypic.tif"). This method allows me to create any number of system options and control them externally. The CREATE SQL command for the settings table is shown here, followed by a sample INSERT command to set the ImagePath option for the example application: CREATE TABLE settings (FieldName varchar(20), Value varchar(255)); INSERT INTO settings VALUES ("ImagePath", "c:\\mysql_embedded\\images\\");
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