// Example 1: Retrieving database connection for default Propel configuration $conn = \Propel\Runtime\Propel::getDbConnection(); // Example 2: Retrieving database connection for specific Propel configuration $config = \Propel\Runtime\Propel::getConfiguration(); $conn = \Propel\Runtime\Util\Propel::getConnection($config['datasources']['my_db']);In Example 1, we are retrieving the database connection for the default Propel configuration. This is useful if you only have one database configuration specified in your `propel.xml` file. In Example 2, we first retrieve the Propel configuration object and then use it to retrieve the database connection for a specific datasource (`my_db` in this case). This is useful if you have multiple database configurations in your `propel.xml` file and need to work with a specific database. The `getDbConnection()` function is part of the Propel ORM library, which is available as a package on Packagist (https://packagist.org/packages/propel/propel).