Database Management - Lecture 4 - PHP and Mysql
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The document discusses PHP and MySQL connections and queries. It shows how to connect to a MySQL database using PHP, perform SELECT, INSERT, UPDATE and DELETE queries both in an OOP and procedural style, and check for errors. Examples are given for connecting to a database, running queries, fetching and displaying results, and performing CRUD operations.
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![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";
}](https://image.slidesharecdn.com/3mysql-170612093724/85/Database-Management-Lecture-4-PHP-and-Mysql-6-320.jpg)
![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";
}](https://image.slidesharecdn.com/3mysql-170612093724/85/Database-Management-Lecture-4-PHP-and-Mysql-7-320.jpg)
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- 3. PHP MYSQL
- 4. Connection $conn = new mysqli(server, username, password, dbname); $conn = mysqli_connect(server, username, password, dbname);
- 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 $sql = "INSERT INTO users(firstname, lastname, email) VALUES ('John', 'Doe', '[email protected]')"; mysqli_query($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