What role does the database connection play in PHP if statements for updating records based on form submissions?

When using if statements in PHP to update records based on form submissions, the database connection plays a crucial role in executing the update query. The connection allows PHP to communicate with the database and perform operations such as updating records based on the conditions specified in the if statement. To update records based on form submissions, you need to establish a database connection, retrieve the form data, construct an update query, and execute it using the connection. 

// Establish a database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Retrieve form data
$record_id = $_POST['record_id'];
$new_value = $_POST['new_value'];

// Construct and execute the update query
$sql = "UPDATE table_name SET column_name = '$new_value' WHERE id = $record_id";

if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

// Close the connection
$conn->close();

Keywords

PHP database connection if statements updating records form submissions

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