class mysql extends db {    private static $ins = NULL;    private $conn = NULL;    private $conf = array();        protected function __construct() {        $this->conf = conf::getIns();                $this->connect($this->conf->host,$this->conf->user,$this->conf->pwd);        $this->select_db($this->conf->db);        $this->setChar($this->conf->char);    }       public static function getIns() {        if(!(self::$ins instanceof self)) {            self::$ins = new self();        }        return self::$ins;    }    public function connect($h,$u,$p) {        $this->conn = mysql_connect($h,$u,$p);        if(!$this->conn) {            $err = new Exception(‘连接失败‘);            throw $err;        }    }    protected function select_db($db) {        $sql = ‘use ‘ . $db;        $this->query($sql);    }    protected function setChar($char) {        $sql = ‘set names ‘ . $char;        return $this->query($sql);    }    public function query($sql) {        $rs = mysql_query($sql,$this->conn);        log::write($sql);        return $rs;    }    public function autoExecute($table,$arr,$mode=‘insert‘,$where = ‘ where 1 limit 1‘) {        /*    insert into tbname (username,passwd,email) values (‘‘,)        /// 把所有的键名用‘,‘接起来        // implode(‘,‘,array_keys($arr));        // implode("‘,‘",array_values($arr));        */                if(!is_array($arr)) {            return false;        }        if($mode == ‘update‘) {            $sql = ‘update ‘ . $table .‘ set ‘;            foreach($arr as $k=>$v) {                $sql .= $k . "=‘" . $v ."‘,";            }            $sql = rtrim($sql,‘,‘);            $sql .= $where;                        return $this->query($sql);        }        $sql = ‘insert into ‘ . $table . ‘ (‘ . implode(‘,‘,array_keys($arr)) . ‘)‘;        $sql .= ‘ values (\‘‘;        $sql .= implode("‘,‘",array_values($arr));        $sql .= ‘\‘)‘;        return $this->query($sql);        }    public function getAll($sql) {        $rs = $this->query($sql);                $list = array();        while($row = mysql_fetch_assoc($rs)) {            $list[] = $row;        }        return $list;    }    public function getRow($sql) {        $rs = $this->query($sql);                return mysql_fetch_assoc($rs);    }    public function getOne($sql) {        $rs = $this->query($sql);        $row = mysql_fetch_row($rs);        return $row[0];    }    // 返回影响行数的函数    public function affected_rows() {        return mysql_affected_rows($this->conn);    }    // 返回最新的auto_increment列的自增长的值    public function insert_id() {        return mysql_insert_id($this->conn);    }}