my first php mysql class

<?php

class db

{

	var $querynum = 0;

	var $link;

    var $histories;

    var $dbhost;

    var $dbuser;

    var $dbpw;

    var $dbcharset;

    var $pconnect;

    var $tablepre;

    var $time;

    var $goneaway = 5;

    function connect($dbhost, $dbuser, $dbpw, $dbname = '', $dbcharset = '', $pconnect = 0, $tablepre='', $time = 0)

    {

        $this->dbhost = $dbhost;

        $this->dbuser = $dbuser;

        $this->dbpw = $dbpw;

        $this->dbname = $dbname;

        $this->dbcharset = $dbcharset;

        $this->pconnect = $pconnect;

        $this->tablepre = $tablepre;

        $this->time = $time;

		

        if($pconnect)

        {

            if(!$this->link = mysql_pconnect($dbhost, $dbuser, $dbpw))

            {

                $this->halt('Can not connect to MySQL server');

            }

        }

        else

        {

            if(!$this->link = mysql_connect($dbhost, $dbuser, $dbpw))

            {

                $this->halt('Can not connect to MySQL server');

            }

        }

        if($this->version() > '4.1')

        {

            if($dbcharset)

            {

                mysql_query("SET character_set_connection = ".$dbcharset.", 

                                    character_set_results = ".$dbcharset.", 

                                     character_set_client = binary", $this->link);

            }



            if($this->version() > '5.0.1') {

                mysql_query("SET sql_mode =''", $this->link);

            }

        }

        if($dbname)

        {

            mysql_select_db($dbname, $this->link);

        }

    }

    function fetch_array($query, $result_type = MYSQL_ASSOC)

    {

        return mysql_fetch_array($query, $result_type);

    }

    function result_first($sql)

    {

        $query = $this->query($sql);

        return $this->result($query, 0);

    }

    function fetch_first($sql)

    {

        $query = $this->query($sql);

        return $this->fetch_array($query);

    }

    function fetch_all($sql, $id = '')

    {

        $arr = array();

        $query = $this->query($sql);

        while($data = $this->fetch_array($query))

        {

            $id ? $arr[$data[$id]] = $data : $arr[] = $data;

        }

        return $arr;

    }

    function cache_gc()

    {

        $this->query("DELETE FROM {$this->tablepre}sqlcaches WHERE expiry<$this->time");

    }

    function query($sql, $type = '', $cachetime = FALSE)

    {

        $func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query';

        if(!($query = $func($sql, $this->link)) && $type != 'SILENT')

        {

            $this->halt('MySQL Query Error', $sql);

        }

        $this->querynum++;

        $this->histories[] = $sql;

        return $query;

    }

    

   function result($query, $row)

    {

        $query = @mysql_result($query, $row);

        return $query;

    }

    

    function affected_rows()

    {

        return mysql_affected_rows($this->link);

    }



    function error()

    {

        return (($this->link) ? mysql_error($this->link) : mysql_error());

    }

    function errno()

    {

        return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());

    }

 

    function num_rows($query)

    {

        $query = mysql_num_rows($query);

        return $query;

    }

    function num_fields($query)

    {

        return mysql_num_fields($query);

    }



    function free_result($query)

    {

        return mysql_free_result($query);

    }



    function insert_id()

    {

        return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);

    }



    function fetch_row($query)

    {

        echo $query;

        $query = mysql_fetch_row($query);

        return $query;

    }



    function fetch_fields($query)

    {

        return mysql_fetch_field($query);

    }



    function version()

    {

        return mysql_get_server_info($this->link);

    }



    function close()

    {

        return mysql_close($this->link);

    }



    function halt($message = '', $sql = '')

    {

        $error = mysql_error();

        $errorno = mysql_errno();

        if($errorno == 2006 && $this->goneaway-- > 0)

        {

            $this->connect($this->dbhost, $this->dbuser, $this->dbpw, $this->dbname, $this->dbcharset, $this->pconnect, $this->tablepre, $this->time);

            $this->query($sql);

        }

        else

        {

            $s = '<b>Error:</b>'.$error.'<br />';

            $s .= '<b>Errno:</b>'.$errorno.'<br />';

            $s .= '<b>SQL:</b>:'.$sql;

            exit($s);

        }

    }

}



?>