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适配模式

定义:可以将截然不同的函数接口封装成统一的API
实际应用举例:1.PHP的数据库有mysql,mysqli,pdo3种,可以用适配器模式统一成一致
                        2.cache适配器,将memcache,redis,file,apc等不同的缓存函数,统一成一致

以实际应用举例1作为示例
$db = new IMooc\Database\MySQL();
//$db = new IMooc\Database\MySQLi();
//$db = new IMooc\Database\PDO();
$db->connect(‘127.0.0.1‘, ‘root‘, ‘root‘, ‘test‘);
$db->query("show databases");
$db->close();

<?php
namespace IMooc;

interface IDatabase
{
function connect($host, $user, $passwd, $dbname);
function query($sql);
function close();
}

<?php
namespace IMooc\Database;

use IMooc\IDatabase;

class MySQL implements IDatabase
{
protected $conn;
function connect($host, $user, $passwd, $dbname)
{
$conn = mysql_connect($host, $user, $passwd);
mysql_select_db($dbname, $conn);
$this->conn = $conn;
}

function query($sql)
{
$res = mysql_query($sql, $this->conn);
return $res;
}

function close()
{
mysql_close($this->conn);
}
}

<?php
namespace IMooc\Database;

use IMooc\IDatabase;

class MySQLi implements IDatabase
{
protected $conn;

function connect($host, $user, $passwd, $dbname)
{
$conn = mysqli_connect($host,$user,$passwd,$dbname);
$this->conn = $conn;
}

function query($sql)
{
return mysqli_query($this->conn, $sql);
}

function close()
{
mysqli_close($this->conn);
}
}

<?php
namespace IMooc\Database;

use IMooc\IDatabase;

class PDO implements IDatabase
{
protected $conn;
function connect($host, $user, $passwd, $dbname)
{
$conn = new \PDO("mysql:host=$host;dbname=$dbname", $user, $passwd);
$this->conn = $conn;
}

function query($sql)
{
return $this->conn->query($sql);
}

function close()
{
unset($this->conn);
}
}

 



来自为知笔记(Wiz)


适配模式