WebSVN – lars-tiefland.ci – /system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php

<?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 DBLIB 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_dblib_driver extends CI_DB_pdo_driver {

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

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

        /**
         * ORDER BY random keyword
         *
         * @var array
         */
        protected $_random_keyword = array('NEWID()', 'RAND(%d)');

        /**
         * Quoted identifier flag
         *
         * Whether to use SQL-92 standard quoted identifier
         * (double quotes) or brackets for identifier escaping.
         *
         * @var bool
         */
        protected $_quoted_identifier;

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

        /**
         * 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 = $params['subdriver'].':host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);

                        if ( ! empty($this->port))
                        {
                                $this->dsn .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
                        }

                        empty($this->database) OR $this->dsn .= ';dbname='.$this->database;
                        empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
                        empty($this->appname) OR $this->dsn .= ';appname='.$this->appname;
                }
                else
                {
                        if ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 6) === FALSE)
                        {
                                $this->dsn .= ';charset='.$this->char_set;
                        }

                        $this->subdriver = 'dblib';
                }
        }

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

        /**
         * Database connection
         *
         * @param       bool    $persistent
         * @return      object
         */
        public function db_connect($persistent = FALSE)
        {
                if ($persistent === TRUE)
                {
                        log_message('debug', "dblib driver doesn't support persistent connections");
                }

                $this->conn_id = parent::db_connect(FALSE);

                if ( ! is_object($this->conn_id))
                {
                        return $this->conn_id;
                }

                // Determine how identifiers are escaped
                $query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');
                $query = $query->row_array();
                $this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];
                $this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');

                return $this->conn_id;
        }

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

        /**
         * 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)
        {
                $sql = 'SELECT '.$this->escape_identifiers('name')
                        .' FROM '.$this->escape_identifiers('sysobjects')
                        .' WHERE '.$this->escape_identifiers('type')." = 'U'";

                if ($prefix_limit === TRUE && $this->dbprefix !== '')
                {
                        $sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
                                .sprintf($this->_like_escape_str, $this->_like_escape_chr);
                }

                return $sql.' ORDER BY '.$this->escape_identifiers('name');
        }

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

        /**
         * 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 'SELECT COLUMN_NAME
                        FROM INFORMATION_SCHEMA.Columns
                        WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
        }

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

        /**
         * Returns an object with field data
         *
         * @param       string  $table
         * @return      array
         */
        public function field_data($table)
        {
                $sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT
                        FROM INFORMATION_SCHEMA.Columns
                        WHERE UPPER(TABLE_NAME) = '.$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;
                        $retval[$i]->max_length         = ($query[$i]->CHARACTER_MAXIMUM_LENGTH > 0) ? $query[$i]->CHARACTER_MAXIMUM_LENGTH : $query[$i]->NUMERIC_PRECISION;
                        $retval[$i]->default            = $query[$i]->COLUMN_DEFAULT;
                }

                return $retval;
        }

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

        /**
         * 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)
        {
                if ($this->qb_limit)
                {
                        return 'WITH ci_delete AS (SELECT TOP '.$this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete';
                }

                return parent::_delete($table);
        }

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

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

                // As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
                // however an ORDER BY clause is required for it to work
                if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($this->qb_orderby))
                {
                        $orderby = $this->_compile_order_by();

                        // We have to strip the ORDER BY clause
                        $sql = trim(substr($sql, 0, strrpos($sql, $orderby)));

                        // Get the fields to select from our subquery, so that we can avoid CI_rownum appearing in the actual results
                        if (count($this->qb_select) === 0 OR strpos(implode(',', $this->qb_select), '*') !== FALSE)
                        {
                                $select = '*'; // Inevitable
                        }
                        else
                        {
                                // Use only field names and their aliases, everything else is out of our scope.
                                $select = array();
                                $field_regexp = ($this->_quoted_identifier)
                                        ? '("[^\"]+")' : '(\[[^\]]+\])';
                                for ($i = 0, $c = count($this->qb_select); $i < $c; $i++)
                                {
                                        $select[] = preg_match('/(?:\s|\.)'.$field_regexp.'$/i', $this->qb_select[$i], $m)
                                                ? $m[1] : $this->qb_select[$i];
                                }
                                $select = implode(', ', $select);
                        }

                        return 'SELECT '.$select." FROM (\n\n"
                                .preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.trim($orderby).') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
                                ."\n\n) ".$this->escape_identifiers('CI_subquery')
                                ."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.($this->qb_offset + 1).' AND '.$limit;
                }

                return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
        }

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

        /**
         * Insert batch statement
         *
         * Generates a platform-specific insert string from the supplied data.
         *
         * @param       string  $table  Table name
         * @param       array   $keys   INSERT keys
         * @param       array   $values INSERT values
         * @return      string|bool
         */
        protected function _insert_batch($table, $keys, $values)
        {
                // Multiple-value inserts are only supported as of SQL Server 2008
                if (version_compare($this->version(), '10', '>='))
                {
                        return parent::_insert_batch($table, $keys, $values);
                }

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

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

        /**
         * Database version number
         *
         * @return      string
         */
        public function version()
        {
                if (isset($this->data_cache['version']))
                {
                        return $this->data_cache['version'];
                }

                return $this->data_cache['version'] = $this->conn_id->query("SELECT SERVERPROPERTY('ProductVersion') AS ver")->fetchColumn(0);
        }
}
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(root)/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php – Revision 2257
