php封装的连接Mysql类及用法分析

db_name=$dbname; $this->db_host=$dbhost; $this->db_pwd=$dbpwd; $this->db_user=$dbuser; $this->dbconnect(); $this->selectdb(); } //连接数据库 private function db_connect(){ $this->conn=mysql_connect($this->db_host,$this->db_user,$this->db_pwd) or die("Could not Connect MySql Server"); } private function selectdb(){ mysql_select_db($this->db_name) or die("unable to select dbname") } private function query(){ return $this->result=mysql_query($this->querysql); } private function get_result($sql){ $this->querysql=$sql; $this->query(); if($this->get_num()>0){ //mysql_fetch_assoc()和 mysql_fetch_array(,MYSQL_ASSOC)从结果集中取得一行作为关联数组 没有则返回false while($this->rows=mysql_fetch_array($this->result)){ //赋值 数组赋值 resultarray[]= 将影响的行数赋值给数组 $this->resultarray[]=$this->rows } return $this->resultarray; } } //$result返回值为 bool类型 false为没有数据 private function get_num(){ return $this->num=mysql_num_rows($this->result); } } $m=new mysql("testuser","localhost","root","root"); $arreresult=$m->get_result("select * from userinfo");