Subversion-Projekte lars-tiefland.ci

<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)

 * @license	https://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 3.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * PDO Oracle Database Adapter Class

 *

 * Note: _DB is an extender class that the app controller

 * creates dynamically based on whether the query builder

 * class is being used or not.

 *

 * @package		CodeIgniter

 * @subpackage	Drivers

 * @category	Database

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/database/

 */

class CI_DB_pdo_oci_driver extends CI_DB_pdo_driver {

	/**

	 * Sub-driver

	 *

	 * @var	string

	 */

	public $subdriver = 'oci';

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

	/**

	 * List of reserved identifiers

	 *

	 * Identifiers that must NOT be escaped.

	 *

	 * @var	string[]

	 */

	protected $_reserved_identifiers = array('*', 'rownum');

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

	protected $_random_keyword = array('ASC', 'ASC'); // Currently not supported

	/**

	 * COUNT string

	 *

	 * @used-by	CI_DB_driver::count_all()

	 * @used-by	CI_DB_query_builder::count_all_results()

	 *

	 * @var	string

	 */

	protected $_count_string = 'SELECT COUNT(1) AS ';

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

	/**

	 * Class constructor

	 *

	 * Builds the DSN if not already set.

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if (empty($this->dsn))

		{

			$this->dsn = 'oci:dbname=';

			// Oracle has a slightly different PDO DSN format (Easy Connect),

			// which also supports pre-defined DSNs.

			if (empty($this->hostname) && empty($this->port))

			{

				$this->dsn .= $this->database;

			}

			else

			{

				$this->dsn .= '//'.(empty($this->hostname) ? '127.0.0.1' : $this->hostname)

					.(empty($this->port) ? '' : ':'.$this->port).'/';

				empty($this->database) OR $this->dsn .= $this->database;

			}

			empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;

		}

		elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 4) === FALSE)

		{

			$this->dsn .= ';charset='.$this->char_set;

		}

	}

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

	/**

	 * Database version number

	 *

	 * @return	string

	 */

	public function version()

	{

		if (isset($this->data_cache['version']))

		{

			return $this->data_cache['version'];

		}

		$version_string = parent::version();

		if (preg_match('#Release\s(?<version>\d+(?:\.\d+)+)#', $version_string, $match))

		{

			return $this->data_cache['version'] = $match[1];

		}

		return FALSE;

	}

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

	/**

	 * Show table query

	 *

	 * Generates a platform-specific query string so that the table names can be fetched

	 *

	 * @param	bool	$prefix_limit

	 * @return	string

	 */

	protected function _list_tables($prefix_limit = FALSE)

	{

		$sql = 'SELECT "TABLE_NAME" FROM "ALL_TABLES"';

		if ($prefix_limit === TRUE && $this->dbprefix !== '')

		{

			return $sql.' WHERE "TABLE_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "

				.sprintf($this->_like_escape_str, $this->_like_escape_chr);

		}

		return $sql;

	}

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

	/**

	 * Show column query

	 *

	 * Generates a platform-specific query string so that the column names can be fetched

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _list_columns($table = '')

	{

		if (strpos($table, '.') !== FALSE)

		{

			sscanf($table, '%[^.].%s', $owner, $table);

		}

		else

		{

			$owner = $this->username;

		}

		return 'SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS

			WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'

				AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));

	}

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

	/**

	 * Returns an object with field data

	 *

	 * @param	string	$table

	 * @return	array

	 */

	public function field_data($table)

	{

		if (strpos($table, '.') !== FALSE)

		{

			sscanf($table, '%[^.].%s', $owner, $table);

		}

		else

		{

			$owner = $this->username;

		}

		$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHAR_LENGTH, DATA_PRECISION, DATA_LENGTH, DATA_DEFAULT, NULLABLE

			FROM ALL_TAB_COLUMNS

			WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'

				AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));

		if (($query = $this->query($sql)) === FALSE)

		{

			return FALSE;

		}

		$query = $query->result_object();

		$retval = array();

		for ($i = 0, $c = count($query); $i < $c; $i++)

		{

			$retval[$i]			= new stdClass();

			$retval[$i]->name		= $query[$i]->COLUMN_NAME;

			$retval[$i]->type		= $query[$i]->DATA_TYPE;

			$length = ($query[$i]->CHAR_LENGTH > 0)

				? $query[$i]->CHAR_LENGTH : $query[$i]->DATA_PRECISION;

			if ($length === NULL)

			{

				$length = $query[$i]->DATA_LENGTH;

			}

			$retval[$i]->max_length		= $length;

			$default = $query[$i]->DATA_DEFAULT;

			if ($default === NULL && $query[$i]->NULLABLE === 'N')

			{

				$default = '';

			}

			$retval[$i]->default		= $query[$i]->COLUMN_DEFAULT;

		}

		return $retval;

	}

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

	/**

	 * Insert batch statement

	 *

	 * @param	string	$table	Table name

	 * @param	array	$keys	INSERT keys

	 * @param	array	$values	INSERT values

	 * @return 	string

	 */

	protected function _insert_batch($table, $keys, $values)

	{

		$keys = implode(', ', $keys);

		$sql = "INSERT ALL\n";

		for ($i = 0, $c = count($values); $i < $c; $i++)

		{

			$sql .= '	INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n";

		}

		return $sql.'SELECT * FROM dual';

	}

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

	/**

	 * Delete statement

	 *

	 * Generates a platform-specific delete string from the supplied data

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _delete($table)

	{

		if ($this->qb_limit)

		{

			$this->where('rownum <= ',$this->qb_limit, FALSE);

			$this->qb_limit = FALSE;

		}

		return parent::_delete($table);

	}

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

	/**

	 * LIMIT

	 *

	 * Generates a platform-specific LIMIT clause

	 *

	 * @param	string	$sql	SQL Query

	 * @return	string

	 */

	protected function _limit($sql)

	{

		if (version_compare($this->version(), '12.1', '>='))

		{

			// OFFSET-FETCH can be used only with the ORDER BY clause

			empty($this->qb_orderby) && $sql .= ' ORDER BY 1';

			return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';

		}

		return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($this->qb_offset + $this->qb_limit + 1).')'

			.($this->qb_offset ? ' WHERE rnum >= '.($this->qb_offset + 1): '');

	}

}