Databases
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    <p>Here's what I've used (just replace the references to Zzz_Config with $GLOBALS['db_conf'] or something):</p> <pre><code>/** * Extended PDO with databse connection (instance) storage by name. */ class Zzz_Db extends PDO { /** * Named connection instances. * * @var array */ static private $_instances; /** * Retrieves (or instantiates) a connection by name. * * @param string $name Connection name (config item key). * @return Zzz_Db Named connection. */ static public function getInstance($name = null) { $name = $name === null ? 'db' : "db.$name"; if (!isset(self::$_instances[$name])) { if (!$config = Zzz_Config::get($name)) { throw new RuntimeException("No such database config item: $name"); } if (!isset($config['dsn'])) { if (!isset($config['database'])) { throw new RuntimeException('Invalid db config'); } $config['dsn'] = sprintf('%s:host=%s;dbname=%s', isset($config['adapter']) ? $config['adapter'] : 'mysql', isset($config['host']) ? $config['host'] : 'localhost', $config['database']); } $db = self::$_instances[$name] = new self( $config['dsn'], isset($config['username']) ? $config['username'] : null, isset($config['password']) ? $config['password'] : null); $db-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); //$db-&gt;setAttribute(PDO::ATTR_STATEMENT_CLASS, 'Zzz_Db_Statement'); if ($db-&gt;getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') { $db-&gt;setAttribute(PDO::ATTR_EMULATE_PREPARES, true); $db-&gt;exec('SET CHARACTER SET utf8'); } } return self::$_instances[$name]; } } </code></pre> <p>Usage whould be:</p> <pre><code>$db = Zzz_Db::getInstance(); // or Zzz_Db::getInstance('some_named_db') $stmt = $db-&gt;prepare('SELECT ... </code></pre> <p>The goal is to keep the db configuration in an *.ini file (editable by a non-coder).</p>
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    1. POIs this wrapper for PDO 'good code' ? Are there any potential problems?
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    1. COThat code just sets up an instance and returns it doesn't it? Mine goes a little further. Thanks for your answer.
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