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

<?phpclass db_class{ public $db_url; //连接地址 public $db_username; //连接名 public $db_userpassword; //连接密码 public $db_name; //数据库名 public $db_tablename; //表名 public $db_conn; //数据库连接 public $db_order; public $db_limit; public function db_getconn(){ //连接数据库 $this->db_conn= mysqli_connect($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); }}

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php+mysqli数据库程序设计技巧总结》、《php面向对象程序设计入门教程》、《PHP数组(Array)操作技巧大全》、《PHP基本语法入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。