PDO mySql Connection - php

Question

There is a link that I found a while back. What I would like to know is:
How do I query a simple SELECT * FROM table_name using PDO?
I tried playing around with the examples here but I was not getting any results back. All along I have been using the mysql_connect method which I dont want to use anymore. I would like to use following:
<?php
$host="127.0.0.1"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="microict-intrasys"; // Database name //
//$id = 5;
try {
$conn = new PDO('mysql:$host;$db_name,', $username, $password);
$stmt = $conn->prepare('SELECT version FROM system_info');
// $stmt->execute(array('id' => $id));
$result = $stmt->fetchAll();
if ( count($result) )
{
foreach($result as $row)
{
print_r($row);
}
}
else
{
echo "No rows returned.";
}
}
catch(PDOException $e)
{
echo 'ERROR: ' . $e->getMessage();
}
?>

Answer 1

First create the pdo instance and connect...
$db = new PDO('mysql:host=127.0.0.1;dbname=yourDBName;charset=utf8', 'username', 'password');
I use charset as well to have the correct formated data here... but you dont have to use it. Connection string could also look like
PDO("mysql:host=127.0.0.1;dbname=yourDBName" , $username, $password);
(using $username & $password here)
since working with pdo i ran into speed issues when i use localhost instead of 127.0.0.1 PDO seems to use the DNS to translate localhost into 127.0.0.1 and this causes speed. And im talking about seconds just for connecting to DBs
after connecting you can query like
$stmt = $db->query("SELECT * FROM table");
and than fetch could results like
while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo $row['field1'].' '.$row['field2']; //etc...
}
or
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
print_r($result);
so than you should have at least some result.... (simple way)
I guess your problem is...
accourdig to your source you have a issue in your connectionstring....
<?php
$host="127.0.0.1"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="microict-intrasys"; // Database name
//$id = 5;
try {
$conn = new PDO('mysql:host={$host};dbname={$db_name}', $username, $password);
// you neeeeeed this--^ and this--^
$stmt = $conn->prepare('SELECT version FROM system_info');
$stmt->execute(array('id' => $id));
$result = $stmt->fetchAll();
if ( count($result) )
{
foreach($result as $row)
{
print_r($row);
}
}
else
{
echo "No rows returned.";
}
}
catch(PDOException $e)
{
echo 'ERROR: ' . $e->getMessage();
}
?>
you are missing some in your connection string! kinda typo
your parsed string looks like
"mysql:localhost;microict-intrasys"
and thats wrong. it must look like
//"mysql:host=localhost;dbname=microict-intrasys"
"mysql:host=127.0.0.1;dbname=microict-intrasys" // better
PDO Check
if (!defined('PDO::ATTR_DRIVER_NAME')) {
echo 'PDO unavailable';
}