7. PHP and gaghhgashgfsgajhfkhshfasMySQL.pptx

What is MySQLi? What does it do?
- MySQLi is an extension for PHP, often referred to as MySQL
improved. It was introduced in PHP 5.0, and will be in
every version following (until something better comes
along). It allows you to use all of the MySQL database
(version 4.1.3 or newer) servers features. It’s object
oriented interface, making it easier to use
- Support for prepared statements, helping secure you
code
- Support for multiple statements, allowing you to run more
than one query at a time.
- MySQLi not only has an object oriented interface but also
a procedural one. Making it even more widely usable.

Connection to MySQL
<?php
$servername = "localhost";
$username = "username";
$password = “root";
$dbname = "myDB";
// Create connection
$conn=mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn)
{
die("Connection failed: " . mysqli_connect_error());
}
?>

Connection to MySQL
---------------OR -----------------
<?php
$conn = mysqli_connect("localhost", "username", "password",
"myDB"); // Check connection
if (!$conn)
{
}
?>

Connection to MySQL
Parameter Description
host / servername Specifies a host name or an IP address
username Specifies the MySQL username
password Specifies the MySQL password
dbname Specifies the default database to be used
mysqli_connect
The mysqli_connect() function opens a new
connection to the
MySQL server.
die()
The die() function prints a message and exits the
current script.
mysqli_connect_error()
The mysqli_connect_error() function returns the error
description
from the last connection error, if any.

Close the Connection
The connection will be closed automatically
when the script ends. To close the connection before,
use mysqli_close(connection name);
Example:
mysqli_close($conn);

Close the Connection
<?php
$username = "username";
$password = "password";
$dbname = "myDB";
// Check connection
if (!$conn)
{
}
?>

Insert Data From a Form Into a Database
Let’s take a look on the following Database and Table
Database Name : MyDbase
Table Name : tblStudent
Fields Datatype (size)
IDNumber Varchar(20) PRIMARY KEY
StudName Varchar(50) NOT NULL
Grade Int NOT NULL
CREATE TABLE tblStudent
( IDNumber varchar(20) NOT NULL,
StudName varchar(50) NOT NULL,
Grade int NOT NULL,
PRIMARY KEY (IDNumber)
);

Let’s take a look on the following FORM
(insertstud.php)
<form action = "insertstud.php" method = "POST">
IDNumber (required) <br>
<input type = "text" name = "txtIDNumber" /> <br>
StudName (required) <br>
<input type = "text" name = "txtStudName" /> <br>
Grade (required)<br>
<input type = "number" name = "txtGrade" /> <br>
<p>
<input type = "submit" name="submit">
<input type = "reset" name="reset">
<p>
</form>
Note: Insert the code above inside the <body> tag

Insert the following php scripts after the </form> tag.
<?php
//DATABASE CONNECTION
$username = "root";
$password = "";
$dbname = "myDbase";
// Check connection
if (!$conn)
{
}

CONT……
if (isset($_REQUEST['submit']))
{
extract($_REQUEST);
$IDNumber=mysqli_real_escape_string($conn,$_POST['txtIDNumber']);
$StudName=mysqli_real_escape_string($conn,$_POST['txtStudName']);
$Grade = mysqli_real_escape_string($conn,$_POST['txtGrade']);
if (mysqli_query($conn, "insert into tblstudent set IDNumber='$IDNumber',
StudName='$StudName', Grade='$Grade'"))
{ echo 'Student Successfully Inserted'; }
else
{ echo 'Cannot Insert Student'; }
}
?>

mysqli_real_escape_string
- The mysqli_real_escape_string() function escapes special characters
in a string for use in an SQL statement.
Syntax:
mysqli_real_escape_string(connection,escapestring);
connection
- Specifies the MySQL connection to use
escapestring
- The string to be escaped. Characters encoded are NUL
(ASCII 0), n, r, , ', ", and ControlZ.

mysqli_query
The mysqli_query() function performs a query against the database
Syntax:
mysqli_query(connection,query);
connection
- Specifies the MySQL connection to use
query
- Specifies the query string

Display the Result in an HTML Table
dislaystud.php
<?php
$username = "root";
$password = "";
// Check connection
if (!$conn)
{
}

Display the Result in an HTML Table
dislaystud.php cont…
$result = mysqli_query($conn, "SELECT * FROM tblstudent");
echo "<table border='1'>
<tr>
<th>IDNumber</th>
<th>StudName</th>
<th>Grade</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['IDNumber'] . "</td>";
echo "<td>" . $row['StudName'] . "</td>";
echo "<td>" . $row['Grade'] . "</td>";
echo "</tr>";
}
echo "</table>";
?>

Deleting Data from a Database
deletestud.php cont…
<?php
$username = "root";
$password = "";
// Check connection
if (!$conn)
{
}

Deleting Data from a Database
deletestud.php cont…
if (mysqli_query($conn, "DELETE FROM tblStudent WHERE IDNumber= 'TTR/01/01' "))
{
echo 'Student Successfully Deleted';
}
?>

Updating Data from a Database
updatestud.php cont…
<?php
$username = "root";
$password = "";
// Check connection
if (!$conn)
{
}

Updating Data from a Database
updatestud.php cont…
if (mysqli_query($conn, "UPDATE tblStudent SET StudName='Airwind' WHERE
IDNumber='TTR/09/1s0'"))
{
echo 'Student Successfully Updated';
}
?>

7. PHP and gaghhgashgfsgajhfkhshfasMySQL.pptx

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