Query/drivers/sqlite/sqlite_driver.php

<?php
/**
 * Query
 *
 * Free Query Builder / Database Abstraction Layer
 *
 * @author 		Timothy J. Warren
 * @copyright	Copyright (c) 2012
 * @link 		https://github.com/aviat4ion/Query
 * @license 	http://philsturgeon.co.uk/code/dbad-license 
 */

// --------------------------------------------------------------------------

/**
 * SQLite specific class
 *
 * @extends DB_PDO
 */
class SQLite extends DB_PDO {

	/**
	 * Reference to the last executed sql query
	 */
	protected $statement;

	/**
	 * Open SQLite Database
	 *
	 * @param string $dsn
	 * @param string $user
	 * @param string $pass
	 */
	public function __construct($dsn, $user=NULL, $pass=NULL)
	{
		// DSN is simply `sqlite:/path/to/db`
		parent::__construct("sqlite:{$dsn}", $user, $pass);
	}

	// --------------------------------------------------------------------------

	/**
	 * Doesn't apply to sqlite
	 *
	 * @param string $name
	 */
	public function switch_db($name)
	{
		return FALSE;
	}

	// --------------------------------------------------------------------------

	/**
	 * Empty a table
	 *
	 * @param string $table
	 */
	public function truncate($table)
	{
		// SQLite has a TRUNCATE optimization,
		// but no support for the actual command.
		$sql = 'DELETE FROM "'.$table.'"';

		$this->statement = $this->query($sql);

		return $this->statement;
	}

	// --------------------------------------------------------------------------

	/**
	 * List tables for the current database
	 *
	 * @return mixed
	 */
	public function get_tables()
	{
		$tables = array();
		$sql = <<<SQL
			SELECT "name"
			FROM "sqlite_master"
			WHERE "type"='table'
			ORDER BY "name" DESC
SQL;

		$res = $this->query($sql);
		return db_filter($res->fetchAll(PDO::FETCH_ASSOC), 'name');
	}

	// --------------------------------------------------------------------------

	/**
	 * List system tables for the current database
	 *
	 * @return array
	 */
	public function get_system_tables()
	{
		//SQLite only has the sqlite_master table
		// that is of any importance.
		return array('sqlite_master');
	}

	// --------------------------------------------------------------------------

	/**
	 * Load a database for the current connection
	 *
	 * @param string $db
	 * @param string $name
	 */
	public function load_database($db, $name)
	{
		$sql = 'ATTACH DATABASE "'.$db.'" AS "'.$name.'"';
		$this->query($sql);
	}

	// --------------------------------------------------------------------------

	/**
	 * Unload a database from the current connection
	 *
	 * @param string $name
	 */
	public function unload_database($name)
	{
		$sql = 'DETACH DATABASE ":name"';

		$this->prepare_query($sql, array(
			':name' => $name,
		));

		$this->statement->execute();
	}

	// --------------------------------------------------------------------------

	/**
	 * Return the number of rows returned for a SELECT query
	 *
	 * @return int
	 */
	public function num_rows()
	{
		return (isset($this->statement)) ? $this->statement->rowCount() : FALSE;
	}
}
//End of sqlite_driver.php