Database

The Nette Database Core is a wrapper around the PDO and provides core functionality.

The Nette Database Explorer layer helps you to fetch database data more easily and in a more optimized way.

Creating a connection

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

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

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.

If you want that connection with the database server is not created immediately after an instance of Connection is created but only when the database is used, you can do so by setting the configuration to 'lazy' => TRUE.

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, which allows you create multiple connections and helps you to add database panel to Tracy debug bar.

    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
            conventions:  discovered  # or static or name of your class, default is discovered
            autowired:    true
        anotherConnection:
            dsn: ...
            autowired: false

Queries

Database\Connection allows you to easily query your database by calling query method, which returns ResultSet.

$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();