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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
/**
* This is the MS SQL Server Native database abstraction layer.
* PHP mssql native driver required.
* @author Chris Pucci
*
*/
namespace phpbb\db\driver;
class mssqlnative extends \phpbb\db\driver\mssql_base
{
    var $m_insert_id = null;
    var $last_query_text = '';
    var $query_options = array();
    var $connect_error = '';
    /**
    * {@inheritDoc}
    */
    function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
    {
        // Test for driver support, to avoid suppressed fatal error
        if (!function_exists('sqlsrv_connect'))
        {
            $this->connect_error = 'Native MS SQL Server driver for PHP is missing or needs to be updated. Version 1.1 or later is required to install phpBB3. You can download the driver from: http://www.microsoft.com/sqlserver/2005/en/us/PHP-Driver.aspx';
            return $this->sql_error('');
        }
        //set up connection variables
        $this->persistency = $persistency;
        $this->user = $sqluser;
        $this->dbname = $database;
        $port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';
        $this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');
        //connect to database
        $this->db_connect_id = sqlsrv_connect($this->server, array(
            'Database' => $this->dbname,
            'UID' => $this->user,
            'PWD' => $sqlpassword,
            'CharacterSet' => 'UTF-8'
        ));
        return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
    }
    /**
    * {@inheritDoc}
    */
    function sql_server_info($raw = false, $use_cache = true)
    {
        global $cache;
        if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mssql_version')) === false)
        {
            $arr_server_info = sqlsrv_server_info($this->db_connect_id);
            $this->sql_server_version = $arr_server_info['SQLServerVersion'];
            if (!empty($cache) && $use_cache)
            {
                $cache->put('mssql_version', $this->sql_server_version);
            }
        }
        if ($raw)
        {
            return $this->sql_server_version;
        }
        return ($this->sql_server_version) ? 'MSSQL<br />' . $this->sql_server_version : 'MSSQL';
    }
    /**
    * {@inheritDoc}
    */
    function sql_buffer_nested_transactions()
    {
        return true;
    }
    /**
    * SQL Transaction
    * @access private
    */
    function _sql_transaction($status = 'begin')
    {
        switch ($status)
        {
            case 'begin':
                return sqlsrv_begin_transaction($this->db_connect_id);
            break;
            case 'commit':
                return sqlsrv_commit($this->db_connect_id);
            break;
            case 'rollback':
                return sqlsrv_rollback($this->db_connect_id);
            break;
        }
        return true;
    }
    /**
    * {@inheritDoc}
    */
    function sql_query($query = '', $cache_ttl = 0)
    {
        if ($query != '')
        {
            global $cache;
            if ($this->debug_sql_explain)
            {
                $this->sql_report('start', $query);
            }
            else if ($this->debug_load_time)
            {
                $this->curtime = microtime(true);
            }
            $this->last_query_text = $query;
            $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
            $this->sql_add_num_queries($this->query_result);
            if ($this->query_result === false)
            {
                try
                {
                    $this->query_result = @sqlsrv_query($this->db_connect_id, $query, array(), $this->query_options);
                }
                catch (\Error $e)
                {
                    // Do nothing as SQL driver will report the error
                }
                if ($this->query_result === false)
                {
                    $this->sql_error($query);
                }
                // Reset options for the next query
                $this->query_options = [];
                if ($this->debug_sql_explain)
                {
                    $this->sql_report('stop', $query);
                }
                else if ($this->debug_load_time)
                {
                    $this->sql_time += microtime(true) - $this->curtime;
                }
                if (!$this->query_result)
                {
                    return false;
                }
                $safe_query_id = $this->clean_query_id($this->query_result);
                if ($cache && $cache_ttl)
                {
                    $this->open_queries[$safe_query_id] = $this->query_result;
                    $this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
                }
                else if (strpos($query, 'SELECT') === 0)
                {
                    $this->open_queries[$safe_query_id] = $this->query_result;
                }
            }
            else if ($this->debug_sql_explain)
            {
                $this->sql_report('fromcache', $query);
            }
        }
        else
        {
            return false;
        }
        return $this->query_result;
    }
    /**
    * Build LIMIT query
    */
    function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
    {
        $this->query_result = false;
        // total == 0 means all results - not zero results
        if ($offset == 0 && $total !== 0)
        {
            if (strpos($query, "SELECT") === false)
            {
                $query = "TOP {$total} " . $query;
            }
            else
            {
                $query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP '.$total, $query);
            }
        }
        else if ($offset > 0)
        {
            $query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP(10000000) ', $query);
            $query = 'SELECT *
                    FROM (SELECT sub2.*, ROW_NUMBER() OVER(ORDER BY sub2.line2) AS line3
                    FROM (SELECT 1 AS line2, sub1.* FROM (' . $query . ') AS sub1) as sub2) AS sub3';
            if ($total > 0)
            {
                $query .= ' WHERE line3 BETWEEN ' . ($offset+1) . ' AND ' . ($offset + $total);
            }
            else
            {
                $query .= ' WHERE line3 > ' . $offset;
            }
        }
        $result = $this->sql_query($query, $cache_ttl);
        return $result;
    }
    /**
    * {@inheritDoc}
    */
    function sql_affectedrows()
    {
        return ($this->db_connect_id) ? @sqlsrv_rows_affected($this->query_result) : false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_fetchrow($query_id = false)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        $safe_query_id = $this->clean_query_id($query_id);
        if ($cache && $cache->sql_exists($safe_query_id))
        {
            return $cache->sql_fetchrow($safe_query_id);
        }
        if (!$query_id)
        {
            return false;
        }
        $row = sqlsrv_fetch_array($query_id, SQLSRV_FETCH_ASSOC);
        if ($row)
        {
            foreach ($row as $key => $value)
            {
                $row[$key] = ($value === ' ' || $value === null) ? '' : $value;
            }
            // remove helper values from LIMIT queries
            if (isset($row['line2']))
            {
                unset($row['line2'], $row['line3']);
            }
        }
        return ($row !== null) ? $row : false;
    }
    /**
     * {@inheritdoc}
     */
    public function sql_last_inserted_id()
    {
        $result_id = @sqlsrv_query($this->db_connect_id, 'SELECT @@IDENTITY');
        if ($result_id)
        {
            $row = sqlsrv_fetch_array($result_id);
            $id = $row[0];
            sqlsrv_free_stmt($result_id);
            return $id;
        }
        else
        {
            return false;
        }
    }
    /**
    * {@inheritDoc}
    */
    function sql_freeresult($query_id = false)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        $safe_query_id = $this->clean_query_id($query_id);
        if ($cache && $cache->sql_exists($safe_query_id))
        {
            return $cache->sql_freeresult($safe_query_id);
        }
        if (isset($this->open_queries[$safe_query_id]))
        {
            unset($this->open_queries[$safe_query_id]);
            return sqlsrv_free_stmt($query_id);
        }
        return false;
    }
    /**
    * return sql error array
    * @access private
    */
    function _sql_error()
    {
        if (function_exists('sqlsrv_errors'))
        {
            $errors = @sqlsrv_errors(SQLSRV_ERR_ERRORS);
            $error_message = '';
            $code = 0;
            if ($errors != null)
            {
                foreach ($errors as $error)
                {
                    $error_message .= "SQLSTATE: " . $error['SQLSTATE'] . "\n";
                    $error_message .= "code: " . $error['code'] . "\n";
                    $code = $error['code'];
                    $error_message .= "message: " . $error['message'] . "\n";
                }
                $this->last_error_result = $error_message;
                $error = $this->last_error_result;
            }
            else
            {
                $error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
            }
            $error = array(
                'message'    => $error,
                'code'        => $code,
            );
        }
        else
        {
            $error = array(
                'message'    => $this->connect_error,
                'code'        => '',
            );
        }
        return $error;
    }
    /**
    * Close sql connection
    * @access private
    */
    function _sql_close()
    {
        return @sqlsrv_close($this->db_connect_id);
    }
    /**
    * Build db-specific report
    * @access private
    */
    function _sql_report($mode, $query = '')
    {
        switch ($mode)
        {
            case 'start':
                $html_table = false;
                @sqlsrv_query($this->db_connect_id, 'SET SHOWPLAN_TEXT ON;');
                if ($result = @sqlsrv_query($this->db_connect_id, $query))
                {
                    sqlsrv_next_result($result);
                    while ($row = sqlsrv_fetch_array($result))
                    {
                        $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
                    }
                    sqlsrv_free_stmt($result);
                }
                @sqlsrv_query($this->db_connect_id, 'SET SHOWPLAN_TEXT OFF;');
                if ($html_table)
                {
                    $this->html_hold .= '</table>';
                }
            break;
            case 'fromcache':
                $endtime = explode(' ', microtime());
                $endtime = $endtime[0] + $endtime[1];
                $result = @sqlsrv_query($this->db_connect_id, $query);
                if ($result)
                {
                    while ($void = sqlsrv_fetch_array($result))
                    {
                        // Take the time spent on parsing rows into account
                    }
                    sqlsrv_free_stmt($result);
                }
                $splittime = explode(' ', microtime());
                $splittime = $splittime[0] + $splittime[1];
                $this->sql_report('record_fromcache', $query, $endtime, $splittime);
            break;
        }
    }
    /**
    * Utility method used to retrieve number of rows
    * Emulates mysql_num_rows
    * Used in acp_database.php -> write_data_mssqlnative()
    * Requires a static or keyset cursor to be definde via
    * mssqlnative_set_query_options()
    */
    function mssqlnative_num_rows($res)
    {
        if ($res !== false)
        {
            return sqlsrv_num_rows($res);
        }
        else
        {
            return false;
        }
    }
    /**
    * Allows setting mssqlnative specific query options passed to sqlsrv_query as 4th parameter.
    */
    function mssqlnative_set_query_options($options)
    {
        $this->query_options = $options;
    }
}