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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 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;
        }

}