7.5 添加模型文件

模型是ZF2对数据库操作的核心内容，也是进行数据过滤、数据交换的功能专区。

7.5.1 添加 Album.php

此文件包括数据交换、表单数据过滤功能；添加 /module/Album/src/Album/Model/Album.php 内容如下：

namespace Album\Model;
use Zend\InputFilter\Factory as InputFactory;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\InputFilterAwareInterface;
use Zend\InputFilter\InputFilterInterface;
class Album implements InputFilterAwareInterface {
    public $id;
    public $artist;
    public $title;
    protected $inputFilter;
    public function exchangeArray($data){
        $this->id       = (isset($data['id'])) ? $data['id'] : null;
        $this->artist   = (isset($data['artist'])) ? $data['artist'] : null;
        $this->title    = (isset($data['title'])) ? $data['title'] : null;
    }

    public function getArrayCopy(){
        return get_object_vars($this);
    }

    public function getInputFilter() {
        if(!$this->inputFilter){
            $this->inputFilter = new InputFilter();
            $factory           = new InputFactory();
            $this->inputFilter->add($factory->createInput(array(
                'name'=>'id',
                'required'=>true,
                'filters'=>array(
                    array('name'=>'Int'),
                ),
            )));

            $this->inputFilter->add($factory->createInput(array(
                'name'=>'artist',
                'required'=>true,
                'filters'=>array(
                    array('name'=>'StripTags'),
                    array('name'=>'StringTrim'),
                ),
                'validators'=>array(
                    array(
                        'name'=>'StringLength',
                        'options'=>array(
                            'encoding'=>'UTF-8',
                            'min'=>5,
                            'max'=>100,
                        ),
                    ),
                ),
            )));

            $this->inputFilter->add($factory->createInput(array(
                'name'=>'title',
                'required'=>true,
                'filters'=>array(
                    array('name'=>'StripTags'),
                    array('name'=>'StringTrim'),
                ),
                'validators'=>array(
                    array(
                        'name'=>'StringLength',
                    'options'=>array(
                        'encoding'=>'UTF-8',
                        'min'=>5,
                        'max'=>100,
                    ),
                    ),
                ),
            )));
        }
        return $this->inputFilter;
    }

    public function setInputFilter(InputFilterInterface $inputFilter) {
        throw new \Exception('Not used');
    }

}

代码解释：

public function exchangeArray($data){} 数据转换

public function getArrayCopy(){} 克隆对象内属性

public function getInputFilter() {} 过滤器

7.5.2 添加AlbumTable.php

此文件为数据库操作网关，实现对数据库的一系列操作；添加文件：/module/Album/src/Album/Model/AlbumTable.php，具体内容如下：

namespace Album\Model;
use Zend\Db\TableGateway\TableGateway;
use Zend\Db\ResultSet\ResultSet;
use Zend\Db\Sql\Select;
use Zend\Paginator\Adapter\DbSelect;
use Zend\Paginator\Paginator;
class AlbumTable {
    protected $tableGateway;
    public function __construct(TableGateway $tg)
    {
        $this->tableGateway = $tg;
    }

    public function fetchAll($paginated=false)
    {
        if($paginated){// 分页
            $select = new Select('album');

            $rs = new ResultSet();
            $rs->setArrayObjectPrototype(new Album());

            $pageAdapter = new DbSelect($select,$this->tableGateway->getAdapter(),$rs);

            $paginator = new Paginator($pageAdapter);
            return $paginator;
        }
        $resultSet  = $this->tableGateway->select();
        return $resultSet;
    }

    public function getAlbum($id)
    {
        $id = (int) $id;
        $rowset = $this->tableGateway->select(array('id'=>$id));
        $row = $rowset->current();

        if(!$row){
            throw new \Exception("Could not find row {$id}");
        }
        return $row;
    }

    public function saveAlbum(Album $album)
    {
        $data = array(
            'artist' =>$album->artist,
            'title' =>$album->title
        );

        $id = (int) $album->id;

        if($id == 0){
            $this->tableGateway->insert($data);
        }else{
            if($this->getAlbum($id)){
                $this->tableGateway->update($data,array('id'=>$id));
            }else{
                throw new \Exception("Could not find row {$id}");
            }
        }

    }

    public function deleteAlbum($id)
    {
        $this->tableGateway->delete(array('id'=>$id));
    }
}

代码解释：

public function fetchAll($paginated=false){} 获取数据表中的所有记录

public function getAlbum($id){} 获取指定ID的记录行

public function saveAlbum(Album $album){} 保存数据到数据库

public function deleteAlbum($id){} 删除指定ID的记录行