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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

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

 *

 * Copyright (c) 2014 - 2018, 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 - 2018, British Columbia Institute of Technology (http://bcit.ca/)

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

 * @link	https://codeigniter.com

 * @since	Version 1.3.0

 * @filesource

 */

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

/**

 * ODBC 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_odbc_driver extends CI_DB_driver {

	/**

	 * Database driver

	 *

	 * @var	string

	 */

	public $dbdriver = 'odbc';

	/**

	 * Database schema

	 *

	 * @var	string

	 */

	public $schema = 'public';

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

	/**

	 * Identifier escape character

	 *

	 * Must be empty for ODBC.

	 *

	 * @var	string

	 */

	protected $_escape_char = '';

	/**

	 * ESCAPE statement string

	 *

	 * @var	string

	 */

	protected $_like_escape_str = " {escape '%s'} ";

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

	protected $_random_keyword = array('RND()', 'RND(%d)');

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

	/**

	 * ODBC result ID resource returned from odbc_prepare()

	 *

	 * @var	resource

	 */

	private $odbc_result;

	/**

	 * Values to use with odbc_execute() for prepared statements

	 *

	 * @var	array

	 */

	private $binds = array();

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

	/**

	 * Class constructor

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		// Legacy support for DSN in the hostname field

		if (empty($this->dsn))

		{

			$this->dsn = $this->hostname;

		}

	}

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

	/**

	 * Non-persistent database connection

	 *

	 * @param	bool	$persistent

	 * @return	resource

	 */

	public function db_connect($persistent = FALSE)

	{

		return ($persistent === TRUE)

			? odbc_pconnect($this->dsn, $this->username, $this->password)

			: odbc_connect($this->dsn, $this->username, $this->password);

	}

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

	/**

	 * Compile Bindings

	 *

	 * @param	string	$sql	SQL statement

	 * @param	array	$binds	An array of values to bind

	 * @return	string

	 */

	public function compile_binds($sql, $binds)

	{

		if (empty($binds) OR empty($this->bind_marker) OR strpos($sql, $this->bind_marker) === FALSE)

		{

			return $sql;

		}

		elseif ( ! is_array($binds))

		{

			$binds = array($binds);

			$bind_count = 1;

		}

		else

		{

			// Make sure we're using numeric keys

			$binds = array_values($binds);

			$bind_count = count($binds);

		}

		// We'll need the marker length later

		$ml = strlen($this->bind_marker);

		// Make sure not to replace a chunk inside a string that happens to match the bind marker

		if ($c = preg_match_all("/'[^']*'|\"[^\"]*\"/i", $sql, $matches))

		{

			$c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i',

				str_replace($matches[0],

					str_replace($this->bind_marker, str_repeat(' ', $ml), $matches[0]),

					$sql, $c),

				$matches, PREG_OFFSET_CAPTURE);

			// Bind values' count must match the count of markers in the query

			if ($bind_count !== $c)

			{

				return $sql;

			}

		}

		elseif (($c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i', $sql, $matches, PREG_OFFSET_CAPTURE)) !== $bind_count)

		{

			return $sql;

		}

		if ($this->bind_marker !== '?')

		{

			do

			{

				$c--;

				$sql = substr_replace($sql, '?', $matches[0][$c][1], $ml);

			}

			while ($c !== 0);

		}

		if (FALSE !== ($this->odbc_result = odbc_prepare($this->conn_id, $sql)))

		{

			$this->binds = array_values($binds);

		}

		return $sql;

	}

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

	/**

	 * Execute the query

	 *

	 * @param	string	$sql	an SQL query

	 * @return	resource

	 */

	protected function _execute($sql)

	{

		if ( ! isset($this->odbc_result))

		{

			return odbc_exec($this->conn_id, $sql);

		}

		elseif ($this->odbc_result === FALSE)

		{

			return FALSE;

		}

		if (TRUE === ($success = odbc_execute($this->odbc_result, $this->binds)))

		{

			// For queries that return result sets, return the result_id resource on success

			$this->is_write_type($sql) OR $success = $this->odbc_result;

		}

		$this->odbc_result = NULL;

		$this->binds       = array();

		return $success;

	}

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

	/**

	 * Begin Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_begin()

	{

		return odbc_autocommit($this->conn_id, FALSE);

	}

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

	/**

	 * Commit Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_commit()

	{

		if (odbc_commit($this->conn_id))

		{

			odbc_autocommit($this->conn_id, TRUE);

			return TRUE;

		}

		return FALSE;

	}

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

	/**

	 * Rollback Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_rollback()

	{

		if (odbc_rollback($this->conn_id))

		{

			odbc_autocommit($this->conn_id, TRUE);

			return TRUE;

		}

		return FALSE;

	}

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

	/**

	 * Determines if a query is a "write" type.

	 *

	 * @param	string	An SQL query string

	 * @return	bool

	 */

	public function is_write_type($sql)

	{

		if (preg_match('#^(INSERT|UPDATE).*RETURNING\s.+(\,\s?.+)*$#is', $sql))

		{

			return FALSE;

		}

		return parent::is_write_type($sql);

	}

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

	/**

	 * Platform-dependent string escape

	 *

	 * @param	string

	 * @return	string

	 */

	protected function _escape_str($str)

	{

		$this->display_error('db_unsupported_feature');

	}

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

	/**

	 * Affected Rows

	 *

	 * @return	int

	 */

	public function affected_rows()

	{

		return odbc_num_rows($this->result_id);

	}

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

	/**

	 * Insert ID

	 *

	 * @return	bool

	 */

	public function insert_id()

	{

		return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : 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)

	{

		$sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = '".$this->schema."'";

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

		{

			return $sql." AND table_name LIKE '".$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 = '')

	{

		return 'SHOW COLUMNS FROM '.$table;

	}

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

	/**

	 * Field data query

	 *

	 * Generates a platform-specific query so that the column data can be retrieved

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _field_data($table)

	{

		return 'SELECT TOP 1 FROM '.$table;

	}

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

	/**

	 * Error

	 *

	 * Returns an array containing code and message of the last

	 * database error that has occurred.

	 *

	 * @return	array

	 */

	public function error()

	{

		return array('code' => odbc_error($this->conn_id), 'message' => odbc_errormsg($this->conn_id));

	}

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

	/**

	 * Close DB Connection

	 *

	 * @return	void

	 */

	protected function _close()

	{

		odbc_close($this->conn_id);

	}

}