Source of file AbstractUtil.php

<?php declare(strict_types=1);

/**

 * Query

 *

 * SQL Query Builder / Database Abstraction Layer

 *

 * PHP version 7.1

 *

 * @package     Query

 * @author      Timothy J. Warren <tim@timshomepage.net>

 * @copyright   2012 - 2018 Timothy J. Warren

 * @license     http://www.opensource.org/licenses/mit-license.html  MIT License

 * @link        https://git.timshomepage.net/aviat4ion/Query

 */

namespace Query\Drivers;

/**

 * Abstract class defining database / table creation methods

 */

abstract class AbstractUtil {

	/**

	 * Reference to the current connection object

	 * @var DriverInterface

	 */

	private $connection;

	/**

	 * Save a reference to the connection object for later use

	 *

	 * @param DriverInterface $connection

	 */

	public function __construct(DriverInterface $connection)

	{

		$this->connection = $connection;

	}

	/**

	 * Get the driver object for the current connection

	 *

	 * @return DriverInterface

	 */

	public function getDriver(): DriverInterface

	{

		return $this->connection;

	}

	/**

	 * Convenience public function to generate sql for creating a db table

	 *

	 * @param string $name

	 * @param array $fields

	 * @param array $constraints

	 * @param bool $ifNotExists

	 * @return string

	 */

	public function createTable($name, $fields, array $constraints=[], $ifNotExists=TRUE): string

	{

		$existsStr = $ifNotExists ? ' IF NOT EXISTS ' : ' ';

		// Reorganize into an array indexed with column information

		// Eg $columnArray[$colname] = [

		// 		'type' => ...,

		// 		'constraint' => ...,

		// 		'index' => ...,

		// ]

		$columnArray = \arrayZipper([

			'type' => $fields,

			'constraint' => $constraints

		]);

		// Join column definitions together

		$columns = [];

		foreach($columnArray as $n => $props)

		{

			$str = $this->getDriver()->quoteIdent($n);

			$str .= isset($props['type']) ? " {$props['type']}" : '';

			$str .= isset($props['constraint']) ? " {$props['constraint']}" : '';

			$columns[] = $str;

		}

		// Generate the sql for the creation of the table

		$sql = 'CREATE TABLE'.$existsStr.$this->getDriver()->quoteTable($name).' (';

		$sql .= implode(', ', $columns);

		$sql .= ')';

		return $sql;

	}

	/**

	 * Drop the selected table

	 *

	 * @param string $name

	 * @return string

	 */

	public function deleteTable($name): string

	{

		return 'DROP TABLE IF EXISTS '.$this->getDriver()->quoteTable($name);

	}

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

	// ! Abstract Methods

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

	/**

	 * Return an SQL file with the database table structure

	 *

	 * @abstract

	 * @return string

	 */

	abstract public function backupStructure(): string;

	/**

	 * Return an SQL file with the database data as insert statements

	 *

	 * @abstract

	 * @return string

	 */

	abstract public function backupData(): string;

}