Database

The Nette\Database\Connection class is a wrapper around the PDO and represents a connection to the database. Nette\Database\Table layer orivudes an enhanced layer for table querying.

Creating a connection

To create a new database connection just create a new instance of Nette\Database\Connection class:

use Nette\Database\Connection;
$connection = new Connection($dsn, $user, $password);

Nette\Database will create create own proper internal driver based on your database server. This internal driver adjusts the Nette\Database behavior for your database server. Nette supports this database servers:

The 4th optional parameter of the connection constructor allows you to specify some options. These options are passed to the PDO constructor and the internal driver constructor, so they can contain a configuration for both the PDO instance and the driver instance.

All connections are created as “lazy” by default. This means the connection is established when it's needed, not when you create a Connection instance. You can disable this behavior by passing 'lazy' => FALSE configuration.

The internal driver class name is detected by provided DSN. However, you can provide you own implementation of an internal driver. To do this, pass your driver name as an option with the driverClass key.

$connection = new Connection($dsn, $user, $password, array(
	'lazy' => FALSE,
	'driverClass' => 'App\YourSpecificDriverImplementationName'
));

The easiest way to create a connection is to configure one in your application config. NetteExtension allows you create multiple connections. NetteExtension helps you to add database panel to Tracy debug bar.

nette:
	database:
		default:
			dsn:        "mysql:host=127.0.0.1;dbname=test"
			user:       "root"
			password:   "password"
			options:    [PDO::MYSQL_ATTR_COMPRESS = true]
			debugger:   true        # debugger bar panel
			explain:    true        # explain queries in debugger bar
			reflection: discovered  # or conventional or classname, default is discovered
			autowired:  true
		anotherConnection:
			dsn: ...
			autowired: false

Queries

$connection->query('INSERT INTO users', array( // an array can be a parameter
	'name' => 'Jim',
	'created' => new DateTime, // or a DateTime object
	'avatar' => fopen('image.gif', 'r'), // or a file
), ...); // it is even possible to use multiple inserts

$connection->query('UPDATE users SET ? WHERE id=?', $data, $id);
$connection->query('SELECT * FROM categories WHERE id=?', 123)->dump();