.NET Crystal qr barcode Getting Started with PHP and MySQL in Java Print QR in Java Getting Started with PHP and MySQL

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Getting Started with PHP and MySQL using barcode maker for none control to generate, create none image in none qr code generation would need t none none o change only a single record to adjust the category, and then the changes would be reflected in all related records. If you use separate tables, you can associate more information with the category. There is no reason you could not add extra fields in the categories table later to add features such as a description of the category, category icon, translated definitions, and more.

A big reason for extracting data into separate tables is ease of use. If you have a single table with a huge number of fields, it looks a lot more complex and difficult to deal with. It is better to have a number of simple, smaller tables.

If you spread your data across a number of smaller tables, your database will perform more efficiently, because it will not need to trudge through endless amounts of irrelevant data.. .NET Development Separating y our information into different tables has a number of benefits, and it is certainly the right way to develop database-driven applications. You will see many examples of how this separation of data across tables works throughout the book..

Creating the Database The next ste p is to actually turn this theory into something you can see, touch, and work with. To do this, you need to make use of your database client. In this example, you will make use of phpMyAdmin, a tool included with XAMPP, to create the database.

First, open your Web browser and connect to phpMyAdmin by accessing http://localhost/phpmyadmin/. A login screen displays in response. If you have only just installed MySQL, or XAMPP, use the username root with no password.

If you are working on a shared computer, change your root password by first connecting to the server with the following command:. mysql -u roo none none t mysql Now issue the following SQL query SET PASSWORD FOR root@localhost=PASSWORD("chinnyraccoon");. Obviously, r eplace the password in the parentheses with your own password. After you have logged into phpMyAdmin, you will see a frame on the left side of the screen that is used to list databases and tables (nothing will be selected currently). In the main body of the screen is a box in which you can type a database.

Practical PHP and MySQL name to be c reated (see Figure 2-2). In this box, type productsdb and click the Create button. You now see the productsdb database appear in the left frame.

Ordinarily, your tables are listed under the database name on the side, but no tables have been created yet.. FIGURE 2-2 Creating a new database is simple in phpMyAdmin. Creating the Tables In the main none for none body of the screen is a box that you can use to create a table. In this box, type the name products and give it 5 fields. You will then be presented with the table design screen.

As shown in Figure 2-3, there are five rows with a number of different boxes to configure each field in the table. The majority of these boxes will be irrelevant in this simple example. Before you create the fields, it s necessary to discuss the concepts of types in MySQL.

In any kind of database programming, the kind of information you store inside the database has different characteristics depending on what type of information it is. For example, if you store a float in a database (a float is a number with a decimal place, such as 21.45), more memory is required to store this type of information than storing an integer (a whole number, such as 35).

In addition to this, different numbers of have different ranges. For example, the TINYINT type in MySQL can store any whole number between 128 and 127. As a contrast, the BIGINT data type can store anything from 9223372036854775808 to 9223372036854775807.

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