如何使用PDO连接到MySQL

Question

I am working on my php as I want to connect to the mysql database using PDO. I have stored the username, password and database in the config file, but I have got a problem with connecting to the mysql database because I keep getting an error.

When I try this:

<?php

//Connect to the database
include('config.php');

$smtps = $link->query('SELECT * FROM sent');
$smtps->execute();
$db = $smtps->get_result();

print($db);
?>

I am getting an error:

Fatal error: Uncaught Error: Call to undefined method PDOStatement::get_result() in /home/username/public_html/test_pdo.php:17 Stack trace: #0 {main} thrown in /home/username/public_html/test_pdo.php on line 17

Here is the line 17:

$db = $smtps->get_result();

Here is the config:

<?php
/* Database credentials. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
define('DB_HOST', 'localhost');
define('DB_USER', 'username');
define('DB_PASS', 'password');
define('DB_NAME', 'dbtablename');
//$errflag = false;
$link = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.'', DB_USER, DB_PASS);

?>

Can you please show me an example how do you connect to mysql database using PDO when you stored the username, password and database name in config.php?

Thank you.

Answer 1

This is happening because get_result() is not a PDO method.

In this situation you should just use fetch() ( link ) if you just want the first result or fetchAll() ( link ) if you want an array of the results

Try this:

$smtps = $link->query('SELECT * FROM sent');
$result = $smtps->fetchAll();

print($result);

You only need to use the excute() when using parameters in your select:

SELECT * FROM sent where id = ?

would be

$smtps = $link->prepare('SELECT * FROM sent where id = ?');
$smtps->execute([$id]);
$result = $smtps->fetch();

print($result);

Answer 2

If u use query method u can without execute method get result as as below cod

include('config.php');

$result = $link->query('SELECT * FROM sent')->fetchAll(PDO::FETCH_ASSOC);


print_r($result);

Answer 3

get_results is not a method of the PDO class. If you want to fetch data from the database in this case, use fetchAll() method of the query object.

<?php

//Connect to the database
include('config.php');

$smtps = $link->query('SELECT * FROM sent');
$smtps->execute();
$db = $smtps->fetchAll();

print($db);
?>

Hope that helps.