Database Management - Lecture 4 - PHP and Mysql

1. WEB DEVELOPMENT

2. PHP
PRESENTATORS
MD. AL-MAMUN SARKAR

3. PHP MYSQL

4. Connection
$conn = new mysqli(server, username, password,
dbname);
$conn = mysqli_connect(server, username, password,
dbname);

5. Query
$conn->query($sql)
mysqli_query($conn, $sql)

6. Select OOP
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"];
}
} else {
echo "0 results";
}

7. Select Procedural
$sql = "SELECT * FROM students";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
while($row = mysqli_fetch_assoc($result)) {
echo "id: " . $row["id"];
}
} else {
echo "0 results";
}

8. Insert
$sql = "INSERT INTO users(firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
mysqli_query($conn, $sql)

9. Update
$sql = "UPDATE users SET lastname='Doe' WHERE id=2";
$conn->query($sql)

10. Delete
$sql = "DELETE FROM students WHERE id=3";
mysqli_query($conn, $sql)

11. QUESTION
?

12. THANK
YOU