<?php
/***************************************************************************
 *                                 mysql4.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : supportphpbb.com
 *
 *   $Id: mysql4.php,v 1.5.2.1 2005/09/18 16:17:20 acydburn Exp $
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program 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.
 *
 ***************************************************************************/

if(!defined("SQL_LAYER"))
{

define("SQL_LAYER","mysql4");

class sql_db
{

        var $db_connect_id;
        var $query_result;
        var $row = array();
        var $rowset = array();
        var $num_queries = 0;
        var $in_transaction = 0;

        //
        // Constructor
        //
        function sql_db($sqlserver, $sqluser, $sqlpassword, $database, $persistency = true)
        {
                $this->persistency = $persistency;
                $this->user = $sqluser;
                $this->password = $sqlpassword;
                $this->server = $sqlserver;
                $this->dbname = $database;

                $this->db_connect_id = ($this->persistency) ? mysql_pconnect($this->server, $this->user, $this->password) : mysql_connect($this->server, $this->user, $this->password);

                if( $this->db_connect_id )
                {
                        if( $database != "" )
                        {
                                $this->dbname = $database;
                                $dbselect = mysql_select_db($this->dbname);

                                if( !$dbselect )
                                {
                                        mysql_close($this->db_connect_id);
                                        $this->db_connect_id = $dbselect;
                                }
                        }

                        return $this->db_connect_id;
                }
                else
                {
                        return false;
                }
        }

        //
        // Other base methods
        //
        function sql_close()
        {
                if( $this->db_connect_id )
                {
                        //
                        // Commit any remaining transactions
                        //
                        if( $this->in_transaction )
                        {
                                mysql_query("COMMIT", $this->db_connect_id);
                        }

                        return mysql_close($this->db_connect_id);
                }
                else
                {
                        return false;
                }
        }

        //
        // Base query method
        //
        function sql_query($query = "", $transaction = FALSE)
        {
                //
                // Remove any pre-existing queries
                //
                unset($this->query_result);

                if( $query != "" )
                {
                        $this->num_queries++;
                        if( $transaction == BEGIN_TRANSACTION && !$this->in_transaction )
                        {
                                $result = mysql_query("BEGIN", $this->db_connect_id);
                                if(!$result)
                                {
                                        return false;
                                }
                                $this->in_transaction = TRUE;
                        }

                        $this->query_result = mysql_query($query, $this->db_connect_id);
                }
                else
                {
                        if( $transaction == END_TRANSACTION && $this->in_transaction )
                        {
                                $result = mysql_query("COMMIT", $this->db_connect_id);
                        }
                }

                if( $this->query_result )
                {
                        unset($this->row[$this->query_result]);
                        unset($this->rowset[$this->query_result]);

                        if( $transaction == END_TRANSACTION && $this->in_transaction )
                        {
                                $this->in_transaction = FALSE;

                                if ( !mysql_query("COMMIT", $this->db_connect_id) )
                                {
                                        mysql_query("ROLLBACK", $this->db_connect_id);
                                        return false;
                                }
                        }
                        
                        return $this->query_result;
                }
                else
                {
                        if( $this->in_transaction )
                        {
                                mysql_query("ROLLBACK", $this->db_connect_id);
                                $this->in_transaction = FALSE;
                        }
                        return false;
                }
        }

        //
        // Other query methods
        //
        function sql_numrows($query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                return ( $query_id ) ? mysql_num_rows($query_id) : false;
        }

        function sql_affectedrows()
        {
                return ( $this->db_connect_id ) ? mysql_affected_rows($this->db_connect_id) : false;
        }

        function sql_numfields($query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                return ( $query_id ) ? mysql_num_fields($query_id) : false;
        }

        function sql_fieldname($offset, $query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                return ( $query_id ) ? mysql_field_name($query_id, $offset) : false;
        }

        function sql_fieldtype($offset, $query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                return ( $query_id ) ? mysql_field_type($query_id, $offset) : false;
        }

        function sql_fetchrow($query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                if( $query_id )
                {
                        $this->row[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC);
                        return $this->row[$query_id];
                }
                else
                {
                        return false;
                }
        }

        function sql_fetchrowset($query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                if( $query_id )
                {
                        unset($this->rowset[$query_id]);
                        unset($this->row[$query_id]);

                        while($this->rowset[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC))
                        {
                                $result[] = $this->rowset[$query_id];
                        }

                        return $result;
                }
                else
                {
                        return false;
                }
        }

        function sql_fetchfield($field, $rownum = -1, $query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                if( $query_id )
                {
                        if( $rownum > -1 )
                        {
                                $result = mysql_result($query_id, $rownum, $field);
                        }
                        else
                        {
                                if( empty($this->row[$query_id]) && empty($this->rowset[$query_id]) )
                                {
                                        if( $this->sql_fetchrow() )
                                        {
                                                $result = $this->row[$query_id][$field];
                                        }
                                }
                                else
                                {
                                        if( $this->rowset[$query_id] )
                                        {
                                                $result = $this->rowset[$query_id][0][$field];
                                        }
                                        else if( $this->row[$query_id] )
                                        {
                                                $result = $this->row[$query_id][$field];
                                        }
                                }
                        }

                        return $result;
                }
                else
                {
                        return false;
                }
        }

        function sql_rowseek($rownum, $query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                return ( $query_id ) ? mysql_data_seek($query_id, $rownum) : false;
        }

        function sql_nextid()
        {
                return ( $this->db_connect_id ) ? mysql_insert_id($this->db_connect_id) : false;
        }

        function sql_freeresult($query_id = 0)
        {
                if( !$query_id )
                {
                        $query_id = $this->query_result;
                }

                if ( $query_id )
                {
                        unset($this->row[$query_id]);
                        unset($this->rowset[$query_id]);

                        mysql_free_result($query_id);

                        return true;
                }
                else
                {
                        return false;
                }
        }

        function sql_error()
        {
                $result['message'] = mysql_error($this->db_connect_id);
                $result['code'] = mysql_errno($this->db_connect_id);

                return $result;
        }

} // class sql_db

} // if ... define

?>