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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.
*
*/
namespace phpbb\db\driver;
/**
* PostgreSQL Database Abstraction Layer
* Minimum Requirement is Version 8.3+
*/
class postgres extends \phpbb\db\driver\driver
{
    var $multi_insert = true;
    var $last_query_text = '';
    var $connect_error = '';
    /**
    * {@inheritDoc}
    */
    function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
    {
        $connect_string = '';
        if ($sqluser)
        {
            $connect_string .= "user=$sqluser ";
        }
        if ($sqlpassword)
        {
            $connect_string .= "password='$sqlpassword";
        }
        if ($sqlserver)
        {
            // $sqlserver can carry a port separated by : for compatibility reasons
            // If $sqlserver has more than one : it's probably an IPv6 address.
            // In this case we only allow passing a port via the $port variable.
            if (substr_count($sqlserver, ':') === 1)
            {
                list($sqlserver, $port) = explode(':', $sqlserver);
            }
            if ($sqlserver !== 'localhost')
            {
                $connect_string .= "host=$sqlserver ";
            }
            if ($port)
            {
                $connect_string .= "port=$port ";
            }
        }
        $schema = '';
        if ($database)
        {
            $this->dbname = $database;
            if (strpos($database, '.') !== false)
            {
                list($database, $schema) = explode('.', $database);
            }
            $connect_string .= "dbname=$database";
        }
        $this->persistency = $persistency;
        if ($this->persistency)
        {
            if (!function_exists('pg_pconnect'))
            {
                $this->connect_error = 'pg_pconnect function does not exist, is pgsql extension installed?';
                return $this->sql_error('');
            }
            $collector = new \phpbb\error_collector;
            $collector->install();
            $this->db_connect_id = (!$new_link) ? @pg_pconnect($connect_string) : @pg_pconnect($connect_string, PGSQL_CONNECT_FORCE_NEW);
        }
        else
        {
            if (!function_exists('pg_connect'))
            {
                $this->connect_error = 'pg_connect function does not exist, is pgsql extension installed?';
                return $this->sql_error('');
            }
            $collector = new \phpbb\error_collector;
            $collector->install();
            $this->db_connect_id = (!$new_link) ? @pg_connect($connect_string) : @pg_connect($connect_string, PGSQL_CONNECT_FORCE_NEW);
        }
        $collector->uninstall();
        if ($this->db_connect_id)
        {
            if ($schema !== '')
            {
                @pg_query($this->db_connect_id, 'SET search_path TO ' . $schema);
            }
            return $this->db_connect_id;
        }
        $this->connect_error = $collector->format_errors();
        return $this->sql_error('');
    }
    /**
    * {@inheritDoc}
    */
    function sql_server_info($raw = false, $use_cache = true)
    {
        global $cache;
        if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('pgsql_version')) === false)
        {
            $query_id = @pg_query($this->db_connect_id, 'SELECT VERSION() AS version');
            if ($query_id)
            {
                $row = pg_fetch_assoc($query_id, null);
                pg_free_result($query_id);
                $this->sql_server_version = (!empty($row['version'])) ? trim(substr($row['version'], 10)) : 0;
                if (!empty($cache) && $use_cache)
                {
                    $cache->put('pgsql_version', $this->sql_server_version);
                }
            }
        }
        return ($raw) ? $this->sql_server_version : 'PostgreSQL ' . $this->sql_server_version;
    }
    /**
    * SQL Transaction
    * @access private
    */
    function _sql_transaction($status = 'begin')
    {
        switch ($status)
        {
            case 'begin':
                return @pg_query($this->db_connect_id, 'BEGIN');
            break;
            case 'commit':
                return @pg_query($this->db_connect_id, 'COMMIT');
            break;
            case 'rollback':
                return @pg_query($this->db_connect_id, 'ROLLBACK');
            break;
        }
        return true;
    }
    /**
    * {@inheritDoc}
    */
    function sql_query($query = '', $cache_ttl = 0)
    {
        if ($query != '')
        {
            global $cache;
            // EXPLAIN only in extra debug mode
            if (defined('DEBUG'))
            {
                $this->sql_report('start', $query);
            }
            else if (defined('PHPBB_DISPLAY_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 ($this->query_result === false)
            {
                if (($this->query_result = @pg_query($this->db_connect_id, $query)) === false)
                {
                    $this->sql_error($query);
                }
                if (defined('DEBUG'))
                {
                    $this->sql_report('stop', $query);
                }
                else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
                {
                    $this->sql_time += microtime(true) - $this->curtime;
                }
                if (!$this->query_result)
                {
                    return false;
                }
                if ($cache && $cache_ttl)
                {
                    $this->open_queries[(int) $this->query_result] = $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[(int) $this->query_result] = $this->query_result;
                }
            }
            else if (defined('DEBUG'))
            {
                $this->sql_report('fromcache', $query);
            }
        }
        else
        {
            return false;
        }
        return $this->query_result;
    }
    /**
    * Build db-specific query data
    * @access private
    */
    function _sql_custom_build($stage, $data)
    {
        return $data;
    }
    /**
    * Build LIMIT query
    */
    function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
    {
        $this->query_result = false;
        // if $total is set to 0 we do not want to limit the number of rows
        if ($total == 0)
        {
            $total = 'ALL';
        }
        $query .= "\n LIMIT $total OFFSET $offset";
        return $this->sql_query($query, $cache_ttl);
    }
    /**
    * {@inheritDoc}
    */
    function sql_affectedrows()
    {
        return ($this->query_result) ? @pg_affected_rows($this->query_result) : false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_fetchrow($query_id = false)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        if ($cache && $cache->sql_exists($query_id))
        {
            return $cache->sql_fetchrow($query_id);
        }
        return ($query_id) ? pg_fetch_assoc($query_id, null) : false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_rowseek($rownum, &$query_id)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        if ($cache && $cache->sql_exists($query_id))
        {
            return $cache->sql_rowseek($rownum, $query_id);
        }
        return ($query_id) ? @pg_result_seek($query_id, $rownum) : false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_nextid()
    {
        $query_id = $this->query_result;
        if ($query_id !== false && $this->last_query_text != '')
        {
            if (preg_match("/^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)/is", $this->last_query_text, $tablename))
            {
                $query = "SELECT currval('" . $tablename[1] . "_seq') AS last_value";
                $temp_q_id = @pg_query($this->db_connect_id, $query);
                if (!$temp_q_id)
                {
                    return false;
                }
                $temp_result = pg_fetch_assoc($temp_q_id, null);
                pg_free_result($query_id);
                return ($temp_result) ? $temp_result['last_value'] : false;
            }
        }
        return false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_freeresult($query_id = false)
    {
        global $cache;
        if ($query_id === false)
        {
            $query_id = $this->query_result;
        }
        if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
        {
            return $cache->sql_freeresult($query_id);
        }
        if (isset($this->open_queries[(int) $query_id]))
        {
            unset($this->open_queries[(int) $query_id]);
            return pg_free_result($query_id);
        }
        return false;
    }
    /**
    * {@inheritDoc}
    */
    function sql_escape($msg)
    {
        return @pg_escape_string($msg);
    }
    /**
    * Build LIKE expression
    * @access private
    */
    function _sql_like_expression($expression)
    {
        return $expression;
    }
    /**
    * Build NOT LIKE expression
    * @access private
    */
    function _sql_not_like_expression($expression)
    {
        return $expression;
    }
    /**
    * {@inheritDoc}
    */
    function cast_expr_to_bigint($expression)
    {
        return 'CAST(' . $expression . ' as DECIMAL(255, 0))';
    }
    /**
    * {@inheritDoc}
    */
    function cast_expr_to_string($expression)
    {
        return 'CAST(' . $expression . ' as VARCHAR(255))';
    }
    /**
    * return sql error array
    * @access private
    */
    function _sql_error()
    {
        // pg_last_error only works when there is an established connection.
        // Connection errors have to be tracked by us manually.
        if ($this->db_connect_id)
        {
            $message = @pg_last_error($this->db_connect_id);
        }
        else
        {
            $message = $this->connect_error;
        }
        return array(
            'message'    => $message,
            'code'        => ''
        );
    }
    /**
    * Close sql connection
    * @access private
    */
    function _sql_close()
    {
        return @pg_close($this->db_connect_id);
    }
    /**
    * Build db-specific report
    * @access private
    */
    function _sql_report($mode, $query = '')
    {
        switch ($mode)
        {
            case 'start':
                $explain_query = $query;
                if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
                {
                    $explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
                }
                else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
                {
                    $explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
                }
                if (preg_match('/^SELECT/', $explain_query))
                {
                    $html_table = false;
                    if ($result = @pg_query($this->db_connect_id, "EXPLAIN $explain_query"))
                    {
                        while ($row = pg_fetch_assoc($result, null))
                        {
                            $html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
                        }
                        pg_free_result($result);
                    }
                    if ($html_table)
                    {
                        $this->html_hold .= '</table>';
                    }
                }
            break;
            case 'fromcache':
                $endtime = explode(' ', microtime());
                $endtime = $endtime[0] + $endtime[1];
                $result = @pg_query($this->db_connect_id, $query);
                if ($result)
                {
                    while ($void = pg_fetch_assoc($result, null))
                    {
                        // Take the time spent on parsing rows into account
                    }
                    pg_free_result($result);
                }
                $splittime = explode(' ', microtime());
                $splittime = $splittime[0] + $splittime[1];
                $this->sql_report('record_fromcache', $query, $endtime, $splittime);
            break;
        }
    }
}