[PHP]Yii2框架的坑

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Yii2框架的几个隐蔽的坑

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摘要：Yii2是一款优秀的通用Web后端框架，结构简单优雅、实用功能丰富、扩展性强、性能搞是他最突出的优点。它优秀的地方你在使用过程中总能轻易的发现，无须赘述。而这些隐蔽的小瑕疵，显得更有必要告诉大家。

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博客: http://www.cnblogs.com/jhzhu邮箱: jhzhuustc@gmail.com作者: 知明所以时间: 2015-08-17

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目录

Yii2框架的几个隐蔽的坑目录说点闲话ActiveRecord被莫名写入？准备知识代码现场总结问题解决方法你的Transaction生效了吗？代码现场问题总结解决方法’Y-m-d’不被识别？代码现场问题总结

说点闲话

距离上次写博客，已经有三个月了。在动手写之前，总是带着深深的罪恶感。被它折磨许久，终于，还是，动手了。

值得庆祝的一件事：最近开始，每天早上8：30起来健身了。有两个视频很好用，只需8分钟，照着做一遍保证你（生）爽（不）到（如）爆（死）。（8分钟腹肌锻炼第2级-下载，8分钟胸肌锻炼第2级-下载）

值得反思的一件事：最近看了《叔本华美学随笔》，改变了我一直以来对阅读的看法。我曾经以为阅读是进步的源动力，却被这本书深深的打脸了。来，先给大家分享一段：

思考才是进步的源动力！

好了，扯淡完毕，步入正题。

ActiveRecord被莫名写入？

准备知识

ActiveRecord的基本用法。如果不理解，可参考这里。

代码现场

/** * @property integer $id * @property string $name * @property string $detail * @property double $price * @property integer $area **/class OcRoom extends ActivieRecord{    ...}$room = OcRoom::find()      //先取出一个对象。    ->select(['id'])        //只取出'id'列    ->where(['id'=>20])    ->one();$room->save();              //保存，会发现此行的其它字段都被写成默认值了。

总结问题

这个例子的问题在于：

我从数据库中取出了一行，也就是代码中的$room，但是只取出了id字段，而其他字段自然就是默认值。当我$room->save()的时候，那些是默认值的字段也被保存到数据库里去了。what!?也就是说，当你想节约资源，不取出所有字段的时候，一定要注意不能保存，否则，很多数据会被莫名修改为默认值。

解决方法

然而，我们有什么解决办法呢？提供几种思路：

自己时刻注意，避免未完全取出的ActiveRecord的保存。修改或继承ActiveRecord, 使得，当此对象由find()新建，且字段没有完全取出，调用save()方法，抛出异常。修改或继承ActiveRecord，使得，当此对象由find()新建，且字段没有完全取出，调用save()方法时，只保存取出过的字段，其他字段被忽略。

你的Transaction生效了吗？

代码现场

/** * @property integer $id * @property string $name **/class OcRoom extends ActiveRecord{    public function rules()    {        return [['name','string','min'=>2,'max'=>10]];    }    ...}class OcHouse extends ActiveRecord{    public function rules()    {        return [['name','string','max'=>10]];    }    ...}$a = new OcRoom();$a->name = '';//name为空字符串，不满足rules()条件。$b = new OcHouse();$b->name = '我的房间';         //name合法，可以保存。$transaction = Yii::$app->db->beginTransaction();try{    $a->save();               //name字段不合法，无法验证通过，在validate()阶段已经返回false,不会进行数据库存储的步骤，所以也不会抛出异常。    $b->save();               //name字段合法，可以正常保存。    $transaction->commit();   //提交后，发现$a保存失败，而$b保存成功。}catch (Exception $e) {    Yii::error($e->getTraceAsString(),__METHOD__);    $transaction->rollBack();}

问题总结

这段代码的问题在于：

大家知道$transaction的存在意义是保证整段数据库存储代码要么全成功，要么全失败。显然，在这个例子中，transaction并没有达到我们想要的效果：$a因为validate()都没过，所以$transation->commit()的时候并不会报错。

解决方法

在$transation块内，所有的save()都要判断下返回值，如果为false，则直接抛出异常。

‘Y-m-d’不被识别？

代码现场

OcRenterBill extends ActiveRecord{    public function rules()    {        return [            ['start_time','date','format'=>'Y-m-d'],        ];    }}$a = new OcRenterBill();$a = '2015-09-12';$a->save(); //会报错，说格式不对。

问题总结

如果一开始，Yii框架就报错，这个还不算坑。坑的是我在Mac上开发时，这个可以完全正常的工作，而发布到线上环境（Ubuntu）后，就弹出“属性start_time格式无效”的错误。而参考官方文档，发现这种格式是允许的官方文档。

啊啊啊。各种试错，最后发现如果改成php:Y-m-d，世界就清净了。所以，如果你遇到这种问题，感激我吧。

以上就介绍了[PHP]Yii2框架的坑，包括了方面的内容，希望对PHP教学有兴趣的朋友有所帮助。