PHP面向对象之领域模型+数据映射器实例(分析)(2)

下面这个类是处理多行记录的，传递数据库中取出的原始数据和映射器进去，然后通过数据映射器在获取数据时将其创建成对象

function __construct (array $raw = null,Mapper $mapper= null){
if(!is_null($raw)&& !is_null($mapper)){
$this->raw = $raw;
$this->total = count($raw);
}
$this->mapper = $mapper;
}

function add(\woo\domain\DmainObject $object){ //这里是直接添加对象
$class = $this->targetClass();
if(!($object instanceof $class)){
throw new Exception("This is a {$class} collection");
}
$this->notifyAccess();
$this->objects[$this->total] = $object;
$this->total ++;
}

abstract function targetClass(); //子类中实现用来在插入对象时检查类型的

protected function notifyAccess(){ //不知道干嘛的

}

private function getRow($num){ //获取集合中的单条数据，就是这里通过数据映射器将数据创建成对象
$this->notifyAccess();
if($num >= $this->total || $num < 0){
return null;
}
if(isset($this->objects[$num]){
return $this->objects[$num];
}
if(isset($this->raw[$num]){
$this->objects[$num] = $this->mapper->createObject($this->raw[$num]);
return $this->objects[$num];
}
}

public function rewind(){ //重置指针
$this->pointer = 0;
}

public function current(){ //获取当前指针对象
return $this->getRow($this->pointer);
}

public function key(){ //获取当前指针
return $this->pointer;
}

public function next(){ //获取当前指针对象,并将指针下移
$row = $this->getRow($this->pointer);
if($row){$this->pointer ++}
return $row;
}

public function valid(){ //验证
return (!is_null($this->current()));
}

}

//子类
class VenueColletion extends Collection implements \woo\domain\VenueCollection{
function targetClass(){
return "\woo\domain\Venue";
}
}

//客户端
$mapper = new \woo\mapper\VenueMapper();
$venue = $mapper->find(12);
print_r($venue);

$venue = new \woo\domain\Venue();
$venue->setName("the likey lounge-yy");
//插入对象到数据库
$mapper->insert($venue);
//从数据库中读出刚才插入的对象
$venue = $mapper->find($venue->getId());
print_r($venue);

//修改对象
$venue->setName("the bibble beer likey lounge-yy");
//调用update来更新记录
$mapper->update($venue);
//再次读出对象数据
$venue = $mapper->find($venue->getId());
print_r($venue);

//结束

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（编辑：ASP站长网）