<?php
/***************************************************************************
 *                               msaccess.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : support@phpbb.com
 *
 *   $Id: msaccess.php,v 1.8.2.2 2002/09/28 12:50:59 psotfx 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","msaccess");

class sql_db
{

        var $db_connect_id;
        var $result_ids = array();
        var $result;

        var $next_id;

        var $num_rows = array();
        var $current_row = array();
        var $field_names = array();
        var $field_types = array();
        var $result_rowset = array();

        var $num_queries = 0;

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

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

                return ( $this->db_connect_id ) ? $this->db_connect_id : false;
        }
        //
        // Other base methods
        //
        function sql_close()
        {
                if($this->db_connect_id)
                {
                        if( $this->in_transaction )
                        {
                                @odbc_commit($this->db_connect_id);
                        }

                        if( count($this->result_rowset) )
                        {
                                unset($this->result_rowset);
                                unset($this->field_names);
                                unset($this->field_types);
                                unset($this->num_rows);
                                unset($this->current_row);
                        }

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

        //
        // Query method
        //
        function sql_query($query = "", $transaction = FALSE)
        {
                if( $query != "" )
                {
                        $this->num_queries++;

                        if( $transaction == BEGIN_TRANSACTION && !$this->in_transaction )
                        {
                                if( !odbc_autocommit($this->db_connect_id, false) )
                                {
                                        return false;
                                }
                                $this->in_transaction = TRUE;
                        }

                        $query = str_replace("LOWER(", "LCASE(", $query);

                        if( preg_match("/^SELECT(.*?)(LIMIT ([0-9]+)[, ]*([0-9]+)*)?$/s", $query, $limits) )
                        {
                                $query = $limits[1];

                                if( !empty($limits[2]) )
                                {
                                        $row_offset = ( $limits[4] ) ? $limits[3] : "";
                                        $num_rows = ( $limits[4] ) ? $limits[4] : $limits[3];

                                        $query = "TOP " . ( $row_offset + $num_rows ) . $query;
                                }

                                $this->result = odbc_exec($this->db_connect_id, "SELECT $query");

                                if( $this->result )
                                {
                                        if( empty($this->field_names[$this->result]) )
                                        {
                                                for($i = 1; $i < odbc_num_fields($this->result) + 1; $i++)
                                                {
                                                        $this->field_names[$this->result][] = odbc_field_name($this->result, $i);
                                                        $this->field_types[$this->result][] = odbc_field_type($this->result, $i);
                                                }
                                        }

                                        $this->current_row[$this->result] = 0;
                                        $this->result_rowset[$this->result] = array();

                                        $row_outer = ( isset($row_offset) ) ? $row_offset + 1 : 1;
                                        $row_outer_max = ( isset($num_rows) ) ? $row_offset + $num_rows + 1 : 1E9;
                                        $row_inner = 0;

                                        while( odbc_fetch_row($this->result, $row_outer) && $row_outer < $row_outer_max )
                                        {
                                                for($j = 0; $j < count($this->field_names[$this->result]); $j++)
                                                {
                                                        $this->result_rowset[$this->result][$row_inner][$this->field_names[$this->result][$j]] = stripslashes(odbc_result($this->result, $j + 1));
                                                }

                                                $row_outer++;
                                                $row_inner++;
                                        }

                                        $this->num_rows[$this->result] = count($this->result_rowset[$this->result]);

                                        odbc_free_result($this->result);
                                }

                        }
                        else if( eregi("^INSERT ", $query) )
                        {
                                $this->result = odbc_exec($this->db_connect_id, $query);

                                if( $this->result )
                                {
                                        $result_id = odbc_exec($this->db_connect_id, "SELECT @@IDENTITY");
                                        if( $result_id )
                                        {
                                                if( odbc_fetch_row($result_id) )
                                                {
                                                        $this->next_id[$this->db_connect_id] = odbc_result($result_id, 1);
                                                        $this->affected_rows[$this->db_connect_id] = odbc_num_rows($this->result);
                                                }
                                        }
                                }
                        }
                        else
                        {
                                $this->result = odbc_exec($this->db_connect_id, $query);

                                if( $this->result )
                                {
                                        $this->affected_rows[$this->db_connect_id] = odbc_num_rows($this->result);
                                }
                        }

                        if( !$this->result )
                        {
                                if( $this->in_transaction )
                                {
                                        odbc_rollback($this->db_connect_id);
                                        odbc_autocommit($this->db_connect_id, true);
                                        $this->in_transaction = FALSE;
                                }

                                return false;
                        }

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

                                if ( !@odbc_commit($this->db_connect_id) )
                                {
                                        odbc_rollback($this->db_connect_id);
                                        odbc_autocommit($this->db_connect_id, true);
                                        return false;
                                }
                                odbc_autocommit($this->db_connect_id, true);
                        }

                        return $this->result;
                }
                else
                {
                        if( $transaction == END_TRANSACTION && $this->in_transaction )
                        {
                                $this->in_transaction = FALSE;

                                if ( !@odbc_commit($this->db_connect_id) )
                                {
                                        odbc_rollback($this->db_connect_id);
                                        odbc_autocommit($this->db_connect_id, true);
                                        return false;
                                }
                                odbc_autocommit($this->db_connect_id, true);
                        }

                        return true;
                }
        }

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

                return ( $query_id ) ? $this->num_rows[$query_id] : false;
        }

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

                return ( $query_id ) ? count($this->field_names[$query_id]) : false;
        }

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

                return ( $query_id ) ? $this->field_names[$query_id][$offset] : false;
        }

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

                return ( $query_id ) ? $this->field_types[$query_id][$offset] : false;
        }

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

                if( $query_id )
                {
                        return ( $this->num_rows[$query_id] && $this->current_row[$query_id] < $this->num_rows[$query_id] ) ? $this->result_rowset[$query_id][$this->current_row[$query_id]++] : false;
                }
                else
                {
                        return false;
                }
        }

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

                if( $query_id )
                {
                        return ( $this->num_rows[$query_id] ) ? $this->result_rowset[$query_id] : false;
                }
                else
                {
                        return false;
                }
        }

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

                if( $query_id )
                {
                        if( $row < $this->num_rows[$query_id] )
                        {
                                $getrow = ($row == -1) ? $this->current_row[$query_id] - 1 : $row;

                                return $this->result_rowset[$query_id][$getrow][$this->field_names[$query_id][$field]];
                        }
                        else
                        {
                                return false;
                        }
                }
                else
                {
                        return false;
                }
        }

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

                if( $query_id )
                {
                        $this->current_row[$query_id] = $offset - 1;
                        return true;
                }
                else
                {
                        return false;
                }
        }

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

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

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

                unset($this->num_rows[$query_id]);
                unset($this->current_row[$query_id]);
                unset($this->result_rowset[$query_id]);
                unset($this->field_names[$query_id]);
                unset($this->field_types[$query_id]);

                return true;
        }

        function sql_error()
        {
                $error['code'] = "";//odbc_error($this->db_connect_id);
                $error['message'] = "Error";//odbc_errormsg($this->db_connect_id);

                return $error;
        }

} // class sql_db

} // if ... define

?>