Module 6WEB SERVER AND SERVER SIDE SCRPTING, PART-2Chapte.docx

Module 6:WEB SERVER AND SERVER SIDE SCRPTING,
PART-2
Chapter 19of Text Book
DATABSE Connection to MySQL / PHP
Internet & World Wide Web
How to Program, 5/e
YANBU UNIVERSITY COLLEGE
Management Science Department
© Yanbu University College
DATABASE CONNECTIVITY
PHP combined with MySQL are cross-platform (you can
develop in Windows and serve on a Unix platform)
PHP Connect to the MySQL Server
Use the PHP mysqli_connect() function to open a new
connection to the MySQL server.
Open a Connection to the MySQL Server
Before we can access data in a database, we must open a
connection to the MySQL server.
In PHP, this is done with the mysqli_connect() function.
Syntax
mysqli_connect(host , username , password , dbname);
STEPS
CREATE A USER in PHPMyAdmin
CREATE A DATABASE

CONNECT TO DATABASE
DATA RETREIVAL/ MANIPULATION

PHP Create Database and Tables
A database holds one or more tables.
Create a Database
The CREATE DATABASE statement is used to create a
database table in MySQL.
We must add the CREATE DATABASE statement to the
mysqli_query() function to execute the command.
The following example creates a database named “MIS352":
<?php
$con=mysqli_connect(“localhost",“haseena",“husna");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " .
mysqli_connect_error();
}
// Create database
$sql="CREATE DATABASE MIS352";
if (mysqli_query($con,$sql))
{
echo "Database MIS352 created successfully";
}
else
{
echo "Error creating database: " . mysqli_error();
}
?>

Create a Table
The CREATE TABLE statement is used to create a table in
MySQL.
We must add the CREATE TABLE statement to the
mysqli_query() function to execute the command.
The following example creates a table named “MArks", with
three columns. The column names will be “STD_ID",
“STD_NAME" and “STD_MARKS":
<?php
$con=mysqli_connect("localhost","PHPClass","hello","MIS352"
);
// Check connection
if(mysqli_connect_errno())
{
echo "Failed to connect to MySQL:" . mysqli_connect_error();
}
// Create table
$sql="CREATE TABLE Marks(STD_ID
CHAR(30),STD_NAME CHAR(30),STD_MARKS INTO(20))";
// Execute query
if(mysqli_query($con,$sql))
{echo "Table Marks created successfully";}
else
{ echo "Error in creating table: " . mysqli_error();
}
?>
Note: When you create a database field of type CHAR, you must
specify the maximum length of the field, e.g. CHAR(50).
The data type specifies what type of data the column can hold.

PHP MySQL Insert Into
Insert Data Into a Database Table
The INSERT INTO statement is used to add new records to a
database table.
Syntax
It is possible to write the INSERT INTO statement in two
forms.
The first form doesn't specify the column names where the data
will be inserted, only their values:
INSERT INTO table_name VALUES (value1, value2,
value3,...)
The second form specifies both the column names and the
values to be inserted:
INSERT INTO table_name (column1, column2,
column3,...)
VALUES (value1, value2, value3,...)
PHP MySQL Insert Into
Example:In the previous slide we created a table named
“Marks", with three columns; “STD_ID", “STD_Name" and
“STD_Marks". We will use the same table in this example. The
following example adds two new records to the “Marks" table:
<?php
// connect with the database and user in Php Myadmin
$n=mysqli_connect("localhost","PHPClass","hello","MIS352");

{
echo(" Error In connection");
}
else
{ echo("database connected");
}
$stuid=($_POST['sid']);
$stuname=($_POST['sn']);
$stumarks=intval($_POST['sa']);
$sql="insert into Marks(STD_ID,STD_NAME,STD_MARKS)
values
('$stuid','$stuname',$stumarks)";
if(mysqli_query($n,$sql))
{echo "<center><h1 style='color:aqua'>Record added
successfully";}
else
{echo"error in insertion";}
mysqli_close($n);
?>
Insert Data From a Form Into a Database
HTML FILE
<html>
<body>
<h1> Insert your Detail in the DATABSE </h1>
<FORM ACTION="new_insert.php" method="post" name="f1">
<label>ID    <input type="text"
name="sid"></label><br> <br>
<label>NAME   <input type="text"
name="sn"></label><br> <br>
<label>MARKS   <input type="text"

name="sa"></label><br> <br>
<label><br><br>
<input type="submit" name="b1" Value="INSERT">
<input type="reset" >
</form>
</body>
</html>
OUT PUT
Now we will create an HTML form that can be used to add new
records to the “MIS352" table. Here is the HTML form:
11
Insert Data From a Form Into a Database
Inserting record
When a user clicks the submit button in the HTML form in the
example above, the form data is sent to "insert.php".
The "insert.php" file connects to a database, and retrieves the
values from the form with the PHP $_POST variables.
Then, the mysqli_query() function executes the INSERT INTO
statement, and a new record will be added to the “Marks" table.
Here is the "insert.php" page:
Insert Data From a Form Into a Database(contd)
Insert.php

<?php
// connect with the database and user in Php Myadmin
$n=mysqli_connect("localhost","PHPClass","hello","MIS352");
{ echo(" Error In connection"); }
else
{ echo("database connected"); }
$stuid=($_POST['sid']);
$stuname=($_POST['sn']);
$stumarks=intval($_POST['sa']);
$sql="insert into Marks(STD_ID,STD_NAME,STD_MARKS)
values
('$stuid','$stuname',$stumarks)";
if(mysqli_query($n,$sql))
{echo "<center><h1 style='color:aqua'>Record added
successfully";}
else
{echo"error in insertion";}
mysqli_close($n);
?>
OUTPUT:
PHP MySQL Select
Select Data From a Database Table
The SELECT statement is used to select data from a database.
Syntax
SELECT column_name(s) FROM table_name
To get PHP to execute the statement above we must use the
mysqli_query() function. This function is used to send a query

or command to a MySQL connection.
The example below stores the data returned by the
mysql_query() function in the $result variable.
Next, we use the mysqli_fetch_array() function to return the
first row from the recordset as an array.
Each call to mysqli_fetch_array() returns the next row in the
recordset.
The while loop loops through all the records in the recordset.
To print the value of each row, we use the PHP $row variable
($row['FirstName'] and $row['LastName']).
<?php
echo "<h1 style='color:magenta'>The contents of Marks
Table:</h1><br> <br>";
);
// Check connection
{ echo "Failed to connect to MySQL: " .
mysqli_connect_error(); }
$result = mysqli_query($con,"SELECT * FROM Marks");
echo "<center> <table border='1'><tr>
<th>STD_ID</th>
<th>STD_NAME</th>
<th>STD_MARKS</th>
</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['STD_ID'] . "</td>";

echo "<td>" . $row['STD_NAME'] . "</td>";
echo "<td>" . $row['STD_MARKS'] . "</td>";
echo "</tr>";
}
echo "</center></table>";
mysqli_close($con);
?>
DATABASE CONNECTIVITY Complete example WITH
mysqli_connect()
<html><Head></head>
<body><p> ID NAME EMAIL </p><br>
<?php
//connection to the database
$con=mysqli_connect("localhost",”haseena",”husna","mis352");
// Check connection
{
echo "Failed to connect to MySQL: " .
mysqli_connect_error();
}
//execute the SQL query and return records
$result = mysqli_query($con,"SELECT * FROM student");
//fetch tha data from the database
{
//display the results
echo $row['ID'] . " " . $row['NAME']. " "
. $row['EMAIL'];
echo "<br />";
}

//close the connection
mysqli_close($con);
?> </body></html>
DATABASE CONNECTIVITY Complete example WITH
mysqli_connect()
Output
Die() Function
Definition and Usage
The die() function prints a message and exits the current script.
This function is an alias of the exit() function.
E.g.
$dbhandle = mysql_connect(‘hostname’, ‘username’,
‘password’)
or die("Unable to connect to MySQL");
DATABASE CONNECTIVITY WITH mysql_connect()
<?php

$dbhandle = mysql_connect(‘hostname’, ‘username’,
‘password’)
or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";
//select a database to work with
$selected = mysql_select_db("examples",$dbhandle)
or die("Could not select examples");
//execute the SQL query and return records
$result = mysql_query("SELECT id, model,year FROM cars");
//fetch tha data from the database
while ($row = mysql_fetch_array($result)) {
echo "ID:".$row{'id'}." Name:".$row{'model'}."Year:
". //display the results
$row{'year'}."<br>";
}
//close the connection
mysql_close($dbhandle);
?>
PHP MySQL The Where Clause
<?php
$con=mysqli_connect("localhost",”PHPClass",”hello","mis352"
);
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM student

WHERE NAME='hia' ");
{
echo $row['ID'] . " " . $row['NAME'] . " " . $row['EMAIL'];
echo "<br>";
}
?>
PHP MySQL Order By Keyword
The ORDER BY Keyword
The ORDER BY keyword is used to sort the data in a recordset
in ascending order by default.
If you want to sort the records in a descending order, you can
use the DESC keyword
<?php
$con=mysqli_connect("localhost",”PHPClass",”Hello","mis352"
);
{
}
$result = mysqli_query($con,"SELECT * FROM student
ORDER BY ID ");
{
echo $row['ID'] . " " . $row['NAME'] . " " . $row['EMAIL'];
echo "<br>";
}
?>

PHP MySQL Update
The UPDATE statement is used to modify data in a table.
<?php
$con=mysqli_connect("localhost",”PHPClass",”Hello","mis352"
);
{
}
$b ="UPDATE student SET ID=36 WHERE NAME=‘Hasi' AND
EMAIL=‘[email protected]'";
if (mysqli_query($con,$b))
{
echo("RECORD UPDATED SUCCESFUL ");
}
?>
PHP MySQL Delete
The DELETE FROM statement is used to delete records from a
database table.
<?php

);
// Check connection
{
}
$a="DELETE FROM Marks WHERE STD_NAME='Malak'";
if (mysqli_query($con,$a))
{
echo "1 record Deleted";
}
else
{
echo "Error in Deletion the record: " . mysqli_error();
}
mysqli_close($con);
?>
OUTPUT:

Module 6WEB SERVER AND SERVER SIDE SCRPTING, PART-2Chapte.docx

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Module 6WEB SERVER AND SERVER SIDE SCRPTING, PART-2Chapte.docx