Basics of Working with PHP and MySQL.pptx

• Connecting to Database,
• Creating,
• Selecting,
• Deleting,
• Updating Records in a table,
• Inserting Multiple
Database operations

Connecting to Database
<?php
$dbserver = "localhost";
$dbuser = "root";
$dbpassword = "";
$con = mysqli_connect($dbserver, $dbuser, $dbpassword);
if (!$con) {
die("Connection Error: " . mysqli_connect_error());
}
echo "Connected successfully";
?>

<?php
$dbuser = "root";
$dbpassword = "";
$con = mysqli_connect($dbserver, $dbuser, $dbpassword);
if (!$con) {
}
$sql = "CREATE DATABASE CollegeDb";
if (mysqli_query($con, $sql)) {
echo "Database created successfully";
} else {
echo "Error :" . mysqli_error($con);
}
mysqli_close($con);
?>

Create Table
$dbuser = "root";
$dbpassword = "";
$database = “collegeDb”
$con = mysqli_connect($dbserver, $dbuser, $dbpassword, $database);
if (!$con) {
}
$sql = "CREATE TABLE Students (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
address VARCHAR(50)
)";
echo "Students table created successfully";
} else {
echo "Error creating table: " . mysqli_error($con);
}
mysqli_close($con);

Insert
$fname = “John”;
$lname = “Nash”;
$address = “Kathmandu”;
$sql = "INSERT INTO students (firstname, lastname, address)
VALUES ('$fname', '$lname', '$address')";
echo "New student added successfully";
} else {
echo mysqli_error($conn);
}
mysqli_close($conn);
?>

Select/Display
$sql = "SELECT id, firstname, lastname FROM students";
$result = mysqli_query($con, $sql);
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo $row["firstname"]. " " . $row["lastname"]. "<br>";
}
} else {
echo "0 results";
}
mysqli_close($con);

Delete
$sql = "delete from students where id = 2";
echo "Student deleted successfully";
} else {
echo mysqli_error($conn);
}
mysqli_close($conn);
?>

update
$sql = "update students set firstname='nohj' where id=2";
echo "Student deleted successfully";
} else {
echo mysqli_error($con);
}
mysqli_close($con);

Insert Multiple
$sql = "INSERT INTO Students (firstname, lastname, address)
VALUES ('John', 'Nash', 'john@abc.com');";
$sql .= "INSERT INTO Students (firstname, lastname, address)
VALUES ('Kamal', 'KC', 'mary@abc.com');";
$sql .= "INSERT INTO Students (firstname, lastname, address)
VALUES ('Ruby', 'Sth', 'julie@abc.com')";
if (mysqli_multi_query($con, $sql)) {
echo "Multiple records inserted successfully";
} else {
echo "Error: " . mysqli_error($con);
}
mysqli_close($con);

Basics of Working with PHP and MySQL.pptx

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