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✏️ Editing: pdo_ibm_driver.php

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, 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 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://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 IBM DB2 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_ibm_driver extends CI_DB_pdo_driver {

/**
	 * Sub-driver
	 *
	 * @var	string
	 */
	public $subdriver = 'ibm';

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

/**
	 * 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 = 'ibm:';

// Pre-defined DSN
			if (empty($this->hostname) && empty($this->HOSTNAME) && empty($this->port) && empty($this->PORT))
			{
				if (isset($this->DSN))
				{
					$this->dsn .= 'DSN='.$this->DSN;
				}
				elseif ( ! empty($this->database))
				{
					$this->dsn .= 'DSN='.$this->database;
				}

return;
			}

$this->dsn .= 'DRIVER='.(isset($this->DRIVER) ? '{'.$this->DRIVER.'}' : '{IBM DB2 ODBC DRIVER}').';';

if (isset($this->DATABASE))
			{
				$this->dsn .= 'DATABASE='.$this->DATABASE.';';
			}
			elseif ( ! empty($this->database))
			{
				$this->dsn .= 'DATABASE='.$this->database.';';
			}

if (isset($this->HOSTNAME))
			{
				$this->dsn .= 'HOSTNAME='.$this->HOSTNAME.';';
			}
			else
			{
				$this->dsn .= 'HOSTNAME='.(empty($this->hostname) ? '127.0.0.1;' : $this->hostname.';');
			}

if (isset($this->PORT))
			{
				$this->dsn .= 'PORT='.$this->port.';';
			}
			elseif ( ! empty($this->port))
			{
				$this->dsn .= ';PORT='.$this->port.';';
			}

$this->dsn .= 'PROTOCOL='.(isset($this->PROTOCOL) ? $this->PROTOCOL.';' : 'TCPIP;');
		}
	}

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

/**
	 * 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)
	{
		$sql = 'SELECT "tabname" FROM "syscat"."tables"
			WHERE "type" = \'T\' AND LOWER("tabschema") = '.$this->escape(strtolower($this->database));

if ($prefix_limit === TRUE && $this->dbprefix !== '')
		{
			$sql .= ' AND "tabname" LIKE \''.$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	$table
	 * @return	array
	 */
	protected function _list_columns($table = '')
	{
		return 'SELECT "colname" FROM "syscat"."columns"
			WHERE LOWER("tabschema") = '.$this->escape(strtolower($this->database)).'
				AND LOWER("tabname") = '.$this->escape(strtolower($table));
	}

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

/**
	 * Returns an object with field data
	 *
	 * @param	string	$table
	 * @return	array
	 */
	public function field_data($table)
	{
		$sql = 'SELECT "colname" AS "name", "typename" AS "type", "default" AS "default", "length" AS "max_length",
				CASE "keyseq" WHEN NULL THEN 0 ELSE 1 END AS "primary_key"
			FROM "syscat"."columns"
			WHERE LOWER("tabschema") = '.$this->escape(strtolower($this->database)).'
				AND LOWER("tabname") = '.$this->escape(strtolower($table)).'
			ORDER BY "colno"';

return (($query = $this->query($sql)) !== FALSE)
			? $query->result_object()
			: FALSE;
	}

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

/**
	 * Update statement
	 *
	 * Generates a platform-specific update string from the supplied data
	 *
	 * @param	string	$table
	 * @param	array	$values
	 * @return	string
	 */
	protected function _update($table, $values)
	{
		$this->qb_limit = FALSE;
		$this->qb_orderby = array();
		return parent::_update($table, $values);
	}

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

/**
	 * Delete statement
	 *
	 * Generates a platform-specific delete string from the supplied data
	 *
	 * @param	string	$table
	 * @return	string
	 */
	protected function _delete($table)
	{
		$this->qb_limit = FALSE;
		return parent::_delete($table);
	}

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

/**
	 * LIMIT
	 *
	 * Generates a platform-specific LIMIT clause
	 *
	 * @param	string	$sql	SQL Query
	 * @return	string
	 */
	protected function _limit($sql)
	{
		$sql .= ' FETCH FIRST '.($this->qb_limit + $this->qb_offset).' ROWS ONLY';

return ($this->qb_offset)
			? 'SELECT * FROM ('.$sql.') WHERE rownum > '.$this->qb_offset
			: $sql;
	}

}

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