自己写的MySQL类

---------- php debug ----------
Server=localhost;DataBase=mysql;UserID=root;Pass=123456
resource(5) of type (mysql result)

Output completed (1 sec consumed) - Normal Termination


class DBCLS
{


//debug 调试开关
var $debug = true;

//debuginfo 错误信息，调试信息
var $debuginfo = "debug informations:rn";

//db_server MySQL主机地址
var $db_server;

//db_name 数据库名
var $db_name;

//db_user 数据库用户名
var $db_user;

//db_passwd 密码
var $db_passwd;

//db_links 数据库连接
var $db_link;

//db_query_sql SQL语句
var $db_query_sql = "show tables";

//db_recordset 结果集，记录集
var $db_recordset;

//ready 就绪开关
var $conntstr_ready = false;
var $link_ready = false;
var $db_ready = false;

//set or return Connection String 返回，或者设定连接字符串
function connection_string($connstr="")
{
if("" == $connstr)
{
//假如没有参数传入，返回已有的连接字符
return "Server=".$this->db_server.";DataBase=".$this->db_name.";UserID=".$this->db_user.";PassWord=".$this->db_passwd;
}
else
{
//否则，解析连接字符，初始化变量
preg_match_all("|([a-zA-Z0-9]*)=([a-zA-Z0-9]*);*|", $connstr, $tmparr, PREG_PATTERN_ORDER);
$this->db_server = (strtolower($tmparr[1][0]) == "server")?$tmparr[2][0]:"";
$this->db_name = (strtolower($tmparr[1][1]) == "database")?$tmparr[2][1]:"";
$this->db_user = (strtolower($tmparr[1][2]) == "userid")?$tmparr[2][2]:"";
$this->db_passwd = (strtolower($tmparr[1][3]) == "password")?$tmparr[2][3]:"";
//var_dump($tmparr);

if("" == $this->db_server or "" == $this->db_name or "" == $this->db_user or "" == $this->db_passwd)
$this->conntstr_ready = false; //假如有其中一个以上变量被赋以空字符串"",预备未就绪
else
$this->conntstr_ready = true;
return $this->conntstr_ready;
}

}


//连接数据库，返回连接对象
function connect()
{
if(!$this->conntstr_ready)
{