PHP设计模式之适配器模式代码实例,php设计模式
目标:
可将一个类的接口转换成客户希望的另外一个接口,使得原本不兼容的接口能够一起工作。通俗的理解就是将不同接口适配成统一的API接口。
角色:
Target适配目标,该角色定义把其他类转换为何种接口,也就是我们的期望接口。
Adaptee被适配者,就是需要被适配的接口。
Adapter适配器,其他的两个角色都是已经存在的角色,而适配器角色是需要新建立的,它用来对Adaptee与Target接口进行适配。
应用场景:
如数据操作有mysql、mysqli、pdo、sqlite、postgresql等,假若生成环境需要更换数据库时,可利用适配器模式统一接口。同理cache的场景也是,这会是更换缓存策略(memcache、redis、apc)更方便。
优势:
被适配者通过适配器完成对适配目标的适配,以达到对客户使用透明的目的。
示例代码:
//适配目标,规定的接口将被适配对象实现 interface IDatabase { public function connect($host, $username, $password, $database); public function query($sql); } //适配器 class Mysql implements IDatabase { protected $connect; public function connect($host, $username, $password, $database) { $connect = mysql_connect($host, $username, $password); mysql_select_db($database, $connect); $this->connect = $connect; //... } public function query($sql) { //... } } //适配器 class Postgresql implements IDatabase { protected $connect; public function connect($host, $username, $password, $database) { $this->connect = pg_connect("host=$host dbname=$database user=$username password=$password"); //... } public function query($sql) { //... } } //客户端使用 $client = new Postgresql(); $client->query($sql);
如上:
Target适配目标: IDataBase接口
Adaptee被适配者: mysql和postgresql的数据库操作函数
Adapter适配器 :mysql类和postgresql类

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