Implement mysql class using singleton pattern

defined('ACC')||exit('Access Denied');
// Encapsulates mysql operation class, including connection function and query function.
class mysql extends absdb{
 protected static $ins = null;
 protected $host; // Host name
 protected $user; // User name
 protected $passwd; // Password
 protected $db; // Database name
 protected $port; // Port
 protected $conn = null;
 // Internal operation, obtain an object
 public static function getIns() {
 if(self::$ins === null) {
 self::$ins = new self() ;
 }
 $conf = conf::getIns();
 self::$ins->host = $conf->host;
 self::$ins->user = $conf->user;
 self::$ins->passwd = $conf->pwd;
 self::$ins->db = $conf->db;
 self::$ins->port = $conf- >port;
 self::$ins->connect();
 self::$ins->select_db();
 self::$ins->setChar();
 return self::$ins ;
 }
 // Do not allow external new operations,
 protected function __construct() {

 }
 // Connect to the database
 public function connect() {
 $this->conn = @mysql_connect($this-> ;host,$this->user,$this->passwd,$this->port);
 if(!$this->conn) {
 $error = new Exception('The database cannot be connected' ,9);
 throw $error;
 }
 }
 // Send sql query
 public function query($sql) {
 $rs = mysql_query($sql,$this->conn);
 if(!$ rs) {
 log::write($sql);
 }
 return $rs;
 }
 // Encapsulate a getAll method
 // Parameters: $sql
 // Return: array,false
 public function getAll($ sql) {
 $rs = $this->query($sql);
 if(!$rs) {
 return false;
 }
 $list = array();
 while($row = mysql_fetch_assoc($rs )) {
 $list[] = $row;
 }
 return $list;

 }
 // Encapsulate a getRow method
 // Parameters: $sql
 // Return: array,false
 public function getRow($ sql) {
 $rs = $this->query($sql);
 if(!$rs) {
 return false;
 }
 return mysql_fetch_assoc($rs);
 }
 // Encapsulate a getOne method,
 // Parameters: $sql
 // Returns: int, str (single value)
 public function getOne($sql) {
 $rs = $this->query($sql);
 if(!$rs ) {
 return false;
 }
 $tmp = mysql_fetch_row($rs);
 return $tmp[0];
 }
 // Encapsulate an affect_rows() method
 // Parameters: None
 // Return int affected Number of rows
 public function affected_rows() {
 return mysql_affected_rows($this->conn);
 }
 // Return the value of the latest generated auto_increment column
 public function last_id() {
 return mysql_insert_id($this-> conn);
 }
 // Select library function
 public function select_db() {
 $sql = 'use ' . $this->db;
 return $this->query($sql);
 }
 / / Function to set character set
 public function setChar() {
 $sql = 'set names utf8';
 return $this->query($sql);
 }
 // Automatically generate insert statements, update statements and execute them
 public function autoExecute($data,$table,$act='insert',$where='') {

 if($act == 'insert') {
 $sql = 'insert into ' . $table . ' (';
 $sql .= implode(',',(array_keys($data)));
 $sql .= ') values ​​('';
 $sql .= implode("','",array_values ($data));
 $sql .= "')";
 } else if($act == 'update') {
 if(!trim($where)) {
 return false;
 }

 $ sql = 'update ' . $table . ' set ';
 foreach($data as $k=>$v) {
 $sql .= $k;
 $sql .= '=';
 $sql .= "'".$v."',";
 }

 $sql = substr($sql,0,-1);
 $sql .= ' where ';
 $sql .= $where;
 } else {
 return false;
 }
 //return $sql;
 return $this->query($sql);

 }
}

mysql