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POMultiple Databases using PDO
 

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    <p>I'm pretty new to using PDO and I would like to set it up so I can have multiple databases as and when I need them. So I've created a function that allows you to pass a database name to be used as and when.</p> <p>It does work to a certain extent, as in it selects the database you pass in but even if the database is omitted or incorrect it still allows you to select tables and rows from a database which seems to be selected at random based on the MySQL user.</p> <p>This isn't a major issue I suppose but I would like to get it to where it won't select any data unless a database has been passed to through my function.</p> <p>My code is below and I would appreciate your thoughts on how I may better approach this. Thanks.</p> <p><strong>index.php</strong></p> <pre><code>require 'app/cream.php'; try { $db = new Cream_Model(); $db = $db-&gt;selectDb( 'cream' ); $data = $db-&gt;query('SELECT * FROM users'); foreach( $data as $row ) { print_r( $row ); } } catch( PDOException $e ) { echo 'An error has occurrred: ' . $e-&gt;getMessage() . '&lt;br /&gt;'; } </code></pre> <p><strong>Model.php</strong></p> <pre><code>class Model { public $connection; public function connect() { try { $connection = new PDO( DB_DSN . ':' . DB_HOST, DB_USERNAME, DB_PASSWORD, array( PDO::ATTR_PERSISTENT =&gt; true ) ); $connection-&gt;setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); $connection-&gt;setAttribute( PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC ); } catch( PDOException $e ) { echo 'An error has occurred: ' . $e-&gt;getMessage() . '&lt;br /&gt;'; die(); } return $connection; } } </code></pre> <p><strong>Cream_Model.php</strong></p> <pre><code>class Cream_Model extends Model { public $conn; public function selectDb( $db ) { try { $conn = $this-&gt;connect(); $conn-&gt;exec( "USE $db" ); } catch( PDOException $e ) { echo 'An error has occurred: ' . $e-&gt;getMessage() . '&lt;br /&gt;'; } return $conn; } } </code></pre>
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    1. COFor PDO, you should NOT exec `USE dbname` directly. Instead, specify dbname in your connection string like ['mysql:host=localhost;dbname=testdb'](http://php.net/manual/en/ref.pdo-mysql.connection.php)
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