Uncaught exception 'PDOException' message 'invalid data source name'
33,434
Gotcha.
For some reason you are extending your class from PDO. So, your 'blogdata' is taken as a DSN.
Just get rid of your DB class and use raw PDO
connect.inc.php:
<?php
$db_host = "localhost";
$db_name = "blogdata";
$db_user = "username";
$db_pass = "password";
$db = new PDO("mysql:host=$db_host;dbname=$db_name", $db_user, $db_pass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
index.php:
<?php
require 'connect.inc.php';
$query = "SELECT * FROM blogposts";
$result = $db->query($query);
while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
Author by
Lisa
Updated on January 21, 2020Comments
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Lisa over 4 years
I´m trying to connect to my database with PDO and show some blogposts on a page. However I´m getting this error message:
Fatal error: Uncaught exception 'PDOException' with message 'invalid data source name' in index.php on line 61...
I´ve been searching for help but really can´t figure out what is wrong so if anyone have any idea it is much appreciated!
I have a separate connect.inc.php file which is included in the index.php file.
This is the connect.inc.php file:
<?php class DB extends PDO { function database_connection() { $db_host = "localhost"; $db_name = "blogdata"; $db_user = "username"; $db_pass = "password"; try { global $db_host, $db_name, $db_user, $db_pass; $pdo = new PDO("mysql:host=$db_host;dbname=$db_name", $db_user, $db_pass); } catch(PDOException $e) { die( 'Query failed: ' . $e->getMessage() ); } } } ?>
And this is the section in the index.php file which is pointed out in the error message:
<?php require 'connect.inc.php'; $db = new DB('blogdata'); $query = "SELECT * FROM blogposts"; if ($result = $db->query($query)) { while ($row = $result->fetch(PDO::FETCH_ASSOC)) { echo ' <section id="content"> <article class="post_title"><h3> ', $row['title'],' </h3></article> <article class="post_message"> ', nl2br ($row['message']),' </article> <article class="post_time"> ',$row['time'],' </article> </section> '; } } ; ?>
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Lisa over 10 yearsThank you! Finally! That solved the problem! However I see what you mean with your above comment. I´ve been fizzling with my connection code for some time and I had a better consistent code first which I messed up when not knowing exactly what I´m doing:/ Is it better to wrap the connection up in a function than using raw PDO?
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Your Common Sense over 10 yearsOnly if you know what are you doing. As a matter of fact, PDO is already such a connection handling class. It has almost everything an average user needs. So, it's better to keep with raw PDO.
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tanjiya over 2 years@YourCommonSense, I did as suggested. But, It's not getting things from connect.inc.php file. As for example: I have created 2function at index.php inside a class. One function is for insertion, another one is for selection. Insertion works fine. But, selection is not able to fetch the connection. So you have any suggestion regarding this?