chhom karath

1. Publishing MySQL Data on the
Web

2. Introduction
• have installed and learned the basics of MySQL, a relational database engine, and
PHP, a server-side scripting language. Now you'll see how to use these two new
tools together to create a true database-driven Website!
• The whole idea of a database-driven Website is to allow the content of the site to
reside in a database, and for that content to be dynamically pulled from the
database to create Web pages for people to view with a regular Web browser

3. • ❑ The visitor's Web browser requests the Web page using a standard URL.
• ❑ The Web server software (Apache, IIS, or whatever) recognizes that the
requested file is a PHP script, and so the server interprets the file using its PHP
plug-in, before responding to the page request.
• ❑ Certain PHP commands (which you have yet to learn) connect to the MySQL
database and request the content that belongs in the Web page.
• ❑ The MySQL database responds by sending the requested content to the PHP
script.
• ❑ The PHP script stores the content into one or more PHP variables, and then uses
the now-familiar echo function to output the content as part of the Web page.
• ❑ The PHP plug-in finishes up by handing a copy of the HTML it has created to the
Web server.
• ❑ The Web server sends the HTML to the Web browser as it would a plain HTML
file, except that instead of coming directly from an HTML file, the page is the
output provided by the PHP plug-in.

4. Connecting to MySQL with PHP
Connect to our MySQL server.
• $dbcnx = mysql_connect('localhost', 'root', 'mypasswd');
– EX:
$dbcnx = @mysql_connect('localhost', 'root', 'mypasswd');
if (!$dbcnx) {
echo( '<p>Unable to connect to the ' .'database server at this time.</p>' );
exit();}
Select your database
– EX:
if (! @mysql_select_db('jokes') ) {
die( '<p>Unable to locate the joke ' .'database at this time.</p>' );
}

5. Sending SQL Queries with PHP
• EX: INSERT
$sql = "INSERT INTO tbcustomer VALUES(2,'Sopheap','F','Siem Reap','23233434')";
if ( @mysql_query($sql) ) {
echo('<p>Insert hery</p>');
}
else {
die('<p>Cannot Insert te: ' . mysql_error() .'</p>');}
• EX: DELETE
$sql = "DELETE FROM tbcustomer WHERE CustID=1";
if ( @mysql_query($sql) ) {
echo('<p>DELETED hery na</p>');
}
else {
die('<p>cannot delete te! : ' . mysql_error() .'</p>');
}

6. • EX: UPDATE
$sql = "UPDATE tbcustomer SET CustName='lola', Gender='F', Address='Phnom
Penh' WHERE CustID=1";
if ( @mysql_query($sql) ) {
echo('<p>Update complete hery na</p>');
}
else {
die('<p>Cannot delete te! ' . mysql_error() .'</p>');
}

7. Handling SELECT Result Sets
• For SELECT queries this just isn't enough.
• In addition to indicating whether the query succeeded or failed, PHP must also
receive the results of the query.
– EX:
$result = @mysql_query('SELECT* FROM tbcustomer;');
if (!$result)
{
die('<p>Error performing query: ' . mysql_error() .'</p>');
}
– EX:
$result = @mysql_query('SELECT* FROM tbcustomer;');
if (!$result){
die('<p>Error performing query: ' . mysql_error() .'</p>');}
while ( $row = mysql_fetch_array($result) ) {
echo('<p>' . $row['CustID'] . '|' . $row['CustName'] . '|' . $row['Gender'] . '|' .
$row['Address'] . '|' . $row['Phone'] . '</p>');
}

8. Inserting Data into the Database
• EX:
$sql = "INSERT INTO tbcustomer SET CustID=1, CustName='lola', Gender='M',
Address='SR', Phone='2343434'";
if (@mysql_query($sql)) {
echo('<p>Your joke has been added.</p>');
}
else {
echo('<p>Error adding submitted joke: ' . mysql_error() . '</p>');
}
Delete Data in the Database
• EX:
$sql = 'DELETE FROM tbcustomer WHERE CustID=1';
if (@mysql_query($sql))
{
echo('<p>has been deleted.</p>');
}
else
{
echo('<p>Error deleting joke: ' . mysql_error() . '</p>');
}