Separate connection from PDO - php

Question

I am new to PDO. I try to understand.
What is the best way to separate the connection from the rest with PDO?
For instance. I have this code that works well:
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "podcast";
try {
$conn = new PDO("mysql:host=$servername; dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected successfully <br>";
$sql = "SELECT podcast, text
FROM bookmarks
WHERE data = :data";
$statement = $conn->prepare($sql);
$data = 1;
$statement->bindValue(':data', $data);
$statement->execute();
echo $statement->rowCount() . " records SELECTED successfully <br>";
$rows = $statement->fetchAll();
foreach($rows as $row){
echo $row['podcast'] . '<br>';
echo $row['text'] . '<br>';
}
}
catch(PDOException $e) {
echo "Error: " . $e->getMessage();
}
$conn = null;
It could be useful to have the connection in a separate file. I tried that and it works well but I am not sure if it is the best way to do it. Is it ok to have the try-catch only with the connection?
index.php:
include("includes/connetion.php")
$sql = "SELECT podcast, text
FROM bookmarks
WHERE data = :data";
$statement = $conn->prepare($sql);
$data = 1;
$statement->bindValue(':data', $data);
$statement->execute();
echo $statement->rowCount() . " records SELECTED successfully <br>";
$rows = $statement->fetchAll();
foreach($rows as $row){
echo $row['podcast'] . '<br>';
echo $row['text'] . '<br>';
}
$conn = null;
connection.php:
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "podcast";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// $conn = new PDO("sqlite:/Applications/MAMP/db/sqlite/podcast", $username, $password); //Lite
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected successfully <br>";
}
catch(PDOException $e)
{
echo "Connection failed: " . $e->getMessage();
}
?>

Answer 1

I tried that and it works well but I am not sure if it is the best way to do it.
As long as your code is a usual spaghetti as shown above, it's all right with include.
Is it ok to have the try-catch only with the connection?
quite contrary, there shouldn't be a try catch with the connection as well:
"Catch an exception only if you have a handling scenario other than just reporting it. Otherwise just let it bubble up to a site-wide handler (note that you don't have to write one, there is a basic built-in handler in PHP, which is quite good)."

Answer 2

If you are trying to catch possible exception you have to do it everywhere you communicate with database. So you have to wrap try-catch also around code which ask database for some data.
Another step is to separate concepts of getting data from database representing them (sending them to output as you do it). You can check some MVC concept - how to do it.