wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

62-10 Industrial Communication Systems
Example 2: To display all data that is in the employeeinfo database table,
mysql> SELECT * FROM employeeinfo;
62.4.3.2 WHERE Clause
To extract those records that fulfill specific criteria
mysql> SELECT LastName, Department FROM employeeinfo WHERE
Employee_ID=2;
62.4.3.3 ORDER BY Keyword
To sort records in the table
mysql> SELECT * FROM employeeinfo ORDER BY Employee_ID DESC;
To sort in ascending order, use ASC instead of DESC.
62.5 Creating Dynamic Web Sites Using PHP and MySQL
We are going to discuss some simple ways to create a dynamic Web site. These include connecting to
the database through PHP, extracting data that sits in MySQL database, and presenting it as a part of
the Web page.
62.5.1 Connecting to Database
To connect to a database using PHP, you do not need any other program. PHP features some built-in
functions that can connect, manage and disconnect to MySQL database.
Syntax:
mysql_connect("localhost","username","password")
Since the connection returns an identifier, we can store it in a variable for later use.
Example:
To display the error message when connection fails, “die” function serves that purpose.
To close the connection
Ex: mysql_close($con);
62.5.2 SQL Queries with PHP
To send SQL queries (commands) to the database and view the results of those queries
Syntax:
mysql_query("query", connection_id);
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