//AnimalTest.java 客户端调用
public class AnimalTest {
public static void main(String[] args) {
Animal dog = AnimalFactory.animalFactory("dog");
dog.eat();
Animal pig = AnimalFactory.animalFactory("pig");
pig.eat();
Animal ani = AnimalFactory.animalFactory("dog");
ani.eat();
ani = AnimalFactory.animalFactory("pig");
ani.eat();
}
}
<?php
define('DB_TYPE','pdo');
interface IDB{
function select();
}
class DBMysql implements IDB{
private $tableName;
private $link;
function __construct($tableName){
$this->tableName=$tableName;
$this->link=mysql_connect('localhost','root','');
mysql_select_db('base',$this->link);
}
function select(){
//从数据库中获取数据
$sql="select * from {$this->tableName}";
$result=mysql_query($sql);
if($result && mysql_num_rows($result)>0){
while($row=mysql_fetch_assoc($result)){
$data[]=$row;
}
return $data;
}else{
return false;
}
}
}
class DBPdo implements IDB{
private $tableName;
private $handler;
function __construct($tableName){
$this->tableName=$tableName;
$dsn="mysql:host=localhost;dbname=ztz";
$this->handler=new Pdo($dsn,'root','');
}
function select(){
//从数据库中获取数据
$sql="select * from {$this->tableName}";
$stmt=$this->handler->query($sql);
return $stmt->fetchAll(PDO::FETCH_ASSOC);
}
}
class DBFactory{
public static function getInstance($tableName='factory'){
$class='DB'.DB_TYPE;
$obj=new $class($tableName);
if($obj instanceof IDB){
return $obj;
}else{
die('该类没有能实现IDB接口');
}
}
}
$m=DBFactory::getInstance();
$arr=$m->select();
echo "<pre>";
print_r($arr);
echo "</pre>";
?>
PHP的简单工厂和Java的意思差不多，但是感觉PHP灵活的多。这里是考虑的是数据库连接，如果换服务器，数据库也跟着换了，那么数据库的连接怎么办，不可能每次都边吧，所以这里就用简单工厂来实现不同数据库的连接。