图书类程序设计初始化文件
程序员文章站
2022-05-24 21:41:34
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php代码
<!--图书类文件: class_book.php--> <?php class book { private $id; private $name; private $price; private $author; function __construct() //__construct:构造函数,建立连接 { //$this->name=$name; //$this->price=$price; //$this->author=$author; } function __set($property_name,$value) { return $this->$property_name=$value; } function __get($property_name) { if(isset($this->$property_name)) { return $this->$property_name; } else { return null; } } function add() //添加书目 { $db=new database(); $query="INSERT INTO Computer (name,price,author) "; $query.="VALUES ('$this->name',$this->price,'$this->author')"; $db->execute($query); $db=null; } function update() //修改书目 { $db=new database(); $query="UPDATE Computer SET "; $query.="name='$this->name',price=$this->price,author='$this->author' "; $query.="WHERE id=$this->id"; $db->execute($query); $db=null; } function delete() //删除书目 { $db=new database(); $query="DELETE FROM Computer WHERE id=$this->id"; $db->execute($query); $db=null; } static function query($condition) //查询书目 { if($condition=="" || $condition==null) $condition=""; else $condition="WHERE ".$condition; $db=new database(); $query="SELECT * FROM Computer ".$condition; $arr=$db->query($query); return $arr; $db=null; } } /* $b=new book("C语言",15.20,"吴强"); $b->add(); //$b->__set(new_author,"3"); //$b->update(); //$b->delete(); //*/ ?>
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