source: trunk/web/punbb/include/dblayer/pgsql.php @ 3

<?php
/***********************************************************************

  Copyright (C) 2002-2005  Rickard Andersson (rickard@punbb.org)

  This file is part of PunBB.

  PunBB is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PunBB is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  MA  02111-1307  USA

************************************************************************/


// Make sure we have built in support for PostgreSQL
if (!function_exists('pg_connect'))
        exit('This PHP environment doesn\'t have PostgreSQL support built in. PostgreSQL support is required if you want to use a PostgreSQL database to run this forum. Consult the PHP documentation for further assistance.');


class DBLayer
{
        var $prefix;
        var $link_id;
        var $query_result;
        var $last_query_text = array();
        var $in_transaction = 0;

        var $saved_queries = array();
        var $num_queries = 0;

        var $error_no = false;
        var $error_msg = 'Unknown';


        function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect)
        {
                $this->prefix = $db_prefix;

                if ($db_host != '')
                {
                        if (strpos($db_host, ':') !== false)
                        {
                                list($db_host, $dbport) = explode(':', $db_host);
                                $connect_str[] = 'host='.$db_host.' port='.$dbport;
                        }
                        else
                        {
                                if ($db_host != 'localhost')
                                        $connect_str[] = 'host='.$db_host;
                        }
                }

                if ($db_name)
                        $connect_str[] = 'dbname='.$db_name;

                if ($db_username != '')
                        $connect_str[] = 'user='.$db_username;

                if ($db_password != '')
                        $connect_str[] = 'password='.$db_password;

                if ($p_connect)
                        $this->link_id = @pg_pconnect(implode(' ', $connect_str));
                else
                        $this->link_id = @pg_connect(implode(' ', $connect_str));

                if (!$this->link_id)
                        error('Unable to connect to PostgreSQL server', __FILE__, __LINE__);
                else
                        return $this->link_id;
        }


        function start_transaction()
        {
                ++$this->in_transaction;

                return (@pg_query($this->link_id, 'BEGIN')) ? true : false;
        }


        function end_transaction()
        {
                --$this->in_transaction;

                if (@pg_query($this->link_id, 'COMMIT'))
                        return true;
                else
                {
                        @pg_query($this->link_id, 'ROLLBACK');
                        return false;
                }
        }


        function query($sql, $unbuffered = false)       // $unbuffered is ignored since there is no pgsql_unbuffered_query()
        {
                if (strrpos($sql, 'LIMIT') !== false)
                        $sql = preg_replace('#LIMIT ([0-9]+),([ 0-9]+)#', 'LIMIT \\2 OFFSET \\1', $sql);

                if (defined('PUN_SHOW_QUERIES'))
                        $q_start = get_microtime();

                @pg_send_query($this->link_id, $sql);
                $this->query_result = @pg_get_result($this->link_id);

                if (pg_result_status($this->query_result) != PGSQL_FATAL_ERROR)
                {
                        if (defined('PUN_SHOW_QUERIES'))
                                $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start));

                        ++$this->num_queries;

                        $this->last_query_text[$this->query_result] = $sql;

                        return $this->query_result;
                }
                else
                {
                        if (defined('PUN_SHOW_QUERIES'))
                                $this->saved_queries[] = array($sql, 0);

                        $this->error_msg = @pg_result_error($this->query_result);

                        if ($this->in_transaction)
                                @pg_query($this->link_id, 'ROLLBACK');

                        --$this->in_transaction;

                        return false;
                }
        }


        function result($query_id = 0, $row = 0)
        {
                return ($query_id) ? @pg_fetch_result($query_id, $row, 0) : false;
        }


        function fetch_assoc($query_id = 0)
        {
                return ($query_id) ? @pg_fetch_assoc($query_id) : false;
        }


        function fetch_row($query_id = 0)
        {
                return ($query_id) ? @pg_fetch_row($query_id) : false;
        }


        function num_rows($query_id = 0)
        {
                return ($query_id) ? @pg_num_rows($query_id) : false;
        }


        function affected_rows()
        {
                return ($this->query_result) ? @pg_affected_rows($this->query_result) : false;
        }


        function insert_id()
        {
                $query_id = $this->query_result;

                if ($query_id && $this->last_query_text[$query_id] != '')
                {
                        if (preg_match('/^INSERT INTO ([a-z0-9\_\-]+)/is', $this->last_query_text[$query_id], $table_name))
                        {
                                // Hack (don't ask)
                                if (substr($table_name[1], -6) == 'groups')
                                        $table_name[1] .= '_g';

                                $temp_q_id = @pg_query($this->link_id, 'SELECT currval(\''.$table_name[1].'_id_seq\')');
                                return ($temp_q_id) ? intval(@pg_fetch_result($temp_q_id, 0)) : false;
                        }
                }

                return false;
        }


        function get_num_queries()
        {
                return $this->num_queries;
        }


        function get_saved_queries()
        {
                return $this->saved_queries;
        }


        function free_result($query_id = false)
        {
                if (!$query_id)
                        $query_id = $this->query_result;

                return ($query_id) ? @pg_free_result($query_id) : false;
        }


        function escape($str)
        {
                return pg_escape_string($str);
        }


        function error()
        {
                $result['error_sql'] = @current(@end($this->saved_queries));
                $result['error_no'] = false;
/*
                if (!empty($this->query_result))
                {
                        $result['error_msg'] = trim(@pg_result_error($this->query_result));
                        if ($result['error_msg'] != '')
                                return $result;
                }

                $result['error_msg'] = (!empty($this->link_id)) ? trim(@pg_last_error($this->link_id)) : trim(@pg_last_error());
*/
                $result['error_msg'] = $this->error_msg;

                return $result;
        }


        function close()
        {
                if ($this->link_id)
                {
                        if ($this->in_transaction)
                        {
                                if (defined('PUN_SHOW_QUERIES'))
                                        $this->saved_queries[] = array('COMMIT', 0);

                                @pg_query($this->link_id, 'COMMIT');
                        }

                        if ($this->query_result)
                                @pg_free_result($this->query_result);

                        return @pg_close($this->link_id);
                }
                else
                        return false;
        }
}