PHP封装的mysqli数据库操作类示例

本文实例讲述了PHP封装的mysqli数据库操作类。分享给大家供大家参考，具体如下：

由于PHPMySQL操作在PHP5.4以下被弃用而推荐使用mysqli（MySQL Improvement），这里是在我原有的MySQL数据库操作类的基础上加以改进而编写出的MySQLI数据库操作类，整体代码与MySQL数据库操作类大致相同，直接实例化db_class即可

db_conn= mysqli_connect($this->db_url,$this->db_username,$this->db_userpassword,$this->db_name);
 if (!$this->db_conn)
 {
      echo "连接 MySQL 失败: " . mysqli_connect_error();
    }
    }
    public function __construct($db_url,$db_username,$db_userpassword,$db_name){ //构造方法赋值
    $this->db_url=$db_url;
 $this->db_username=$db_username;
 $this->db_userpassword=$db_userpassword;
 $this->db_name=$db_name;
 $this->db_order="";
 $this->db_limit="";
 $this->db_getconn();
    mysqli_query($this->db_conn,'set names utf8');
    }
    public function db_settablename($db_tablename){ //设置表名
 $this->db_tablename=$db_tablename;
    }
    public function db_setorder($str){ //排序操作
 $this->db_order="order by $str";
    }
    public function db_setlimit($start,$end){ //分页操作
     $this->db_limit="limit $start,$end";
    }
    public function db_select($typearr="",$where=""){ //查询操作
 if(empty($typearr)){
     $typearr="*";
 }
 else{
     $typearr=implode(",",$typearr);
 }
 if(empty($where)){
     $where="";
 }else{
     $where="where ".$where;
 }
 $arr=array();
 $sql="select $typearr from $this->db_tablename $where $this->db_order $this->db_limit ";
 $result = mysqli_query($this->db_conn,$sql);
 while($row = $result->fetch_array()) {
     $arr[]=$row;
 }
 return $arr;
    }
    public function db_update($typearr,$valuearr,$where=""){ //更新操作
    $sql="";
 if(empty($where)){
     $where="";
 }else{
     $where=" where ".$where;
 }
 $sql.="update $this->db_tablename set ";
  foreach ($typearr as $key=>$value){
      if(count($typearr)-1==$key){
   $sql.=$value."='".$valuearr[$key]."'";
      }else{
   $sql.=$value."='".$valuearr[$key]."'".",";
      }
  }
 $sql.=$where;
    mysqli_query($this->db_conn,$sql);
    }
    public function db_delete($typestr,$valuestr){ //删除操作
    $sql="delete from $this->db_tablename WHERe $typestr=$valuestr";
    mysqli_query($this->db_conn,$sql);
    }
    public function db_insert($typearr,$valuearr){ //插入操作
 $sql="insert into $this->db_tablename(".implode(",", $typearr).") values(".implode(",", $valuearr).")";
    mysqli_query($this->db_conn,$sql);
    }
    public function __destruct(){ //析构方法关闭连接
 mysqli_close($this->db_conn);
    }
}

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希望本文所述对大家PHP程序设计有所帮助。