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mvc - PHP 中什么时候用 component 什么时候用 Model,特别迷惑

Jun 06, 2016 pm 08:34 PM
mvc php yii2 object-oriented design patterns

开始使用yii2,但是被里面的弄得很迷惑,component 和 model的区别是什么样的。

以下是一些自己的心得,可能有错误,请指正:

1)发现yii2一些规律,在 @app/models/*文件 有2种类型。比如InfoForm这样以Form结尾的文件都是继承自Model,而Info.php这样的表名的文件都是继承自 ActiveRecord 。但疑问的是在github上看到的一些yii2的程序,里面的全部都写在一个Info.php这样的里面。(不过网络上使用yii2开发的开源程序真的是少得可怜,没有研究)

2)component 与 model的区别到底是在哪里?什么情况下该用component 什么情况下该用model?貌似继承自 ActiveRecord 的 Info.php 这样的就只是一个单独的这样文件:

<code>php</code><code><br><?php namespace app\models;
use yii\base\ActiveRecord;
class Info extends ActiveRecord {
    public function static tableName(){
        return '{{%my_post}}';
    }
}

</code></code>
Copy after login
Copy after login

然后就没有写其他的功能代码了,其他的写在这个地方似乎不合适了。

3)接到上面第2点,比如当我要实现用户的积分扣除功能。流程逻辑应该如下吧:

<code>1.先检测用户当前的积分是否充足?如果不充足失败且提示。
2.执行积分扣除
3.成功写入积分变更日志
</code>
Copy after login
Copy after login

像第3点这样的,该写在那个文件,特别让人疑惑 /models/Member.php 还是 /models/MemberQuery.php 还是 /components/Member/ScoresUse.php

4)如果真的像 【积分扣除】【用户封禁】这样的功能都制作成单独的组件components,那么ActiveRecord models那么岂不就真的就只剩下第2点里面说的这一段内容的?另外如果真的是这样,那岂不component 变得异常的庞大,但问题是执行【积分扣除】【用户封禁】这样的操作,不是单独某个表的,如果放到 /models/Member.php 里面去执行,需要调用额外的其他表,显然又不符合规范,显得很混乱。

5)比如 【积分扣除】【用户封禁】这样的操作必须可以让正在登陆用户自行调用,又可以让登陆的管理员自行登陆,所以,似乎归类到 model来说完全不适合? 归类到 component 却又还不如直接用 function 单独函数更方便?比如执行 【积分扣除变更】功能:

<code>php</code><code>/**
 * @description 操作用户积分!
 * @param $mid
 * @param $jftype
 * @param string $tips
 * @param null $jfValue2
 * @return bool
 */
function log_jifen_change($mid, $jftype, $tips = '', $jfValue2 = null)
{
    global $dsql;

    $jfvalue = $jfValue2 && is_numeric($jfValue2) ? $jfValue2 : jifen_value($jftype);

    if ($dsql->ExecuteNoneQuery2("UPDATE #@__member SET scores=scores+'$jfvalue' WHERE mid='" . $mid . "' ")) {

        $rs = $dsql->GetOne("SELECT `scores` FROM `#@__member` WHERE `mid`='{$mid}' ");
        $scoresLeft = $rs['scores'];

        $setarr = array(
            'mid'     => $mid, //会员ID
            'jftype'  => $jftype, //积分代码
            'jftime'  => time(), //操作时间
            'jfvalue' => $jfvalue, //本次变更积分
            'tips'    => $tips, //提示内容
            'jfleft'  => $scoresLeft, //剩余的积分
        );

        $dsql->ExecuteNoneQuery("INSERT INTO gk_member_jflog SET " . MkSetSql($setarr));

        return $scoresLeft;
    }

    return false;
}

</code>
Copy after login
Copy after login

PHP中什么时候该用 component 什么时候该用 model?特别让人迷惑。。。

回复内容:

开始使用yii2,但是被里面的弄得很迷惑,component 和 model的区别是什么样的。

以下是一些自己的心得,可能有错误,请指正:

1)发现yii2一些规律,在 @app/models/*文件 有2种类型。比如InfoForm这样以Form结尾的文件都是继承自Model,而Info.php这样的表名的文件都是继承自 ActiveRecord 。但疑问的是在github上看到的一些yii2的程序,里面的全部都写在一个Info.php这样的里面。(不过网络上使用yii2开发的开源程序真的是少得可怜,没有研究)

2)component 与 model的区别到底是在哪里?什么情况下该用component 什么情况下该用model?貌似继承自 ActiveRecord 的 Info.php 这样的就只是一个单独的这样文件:

<code>php</code><code><br><?php namespace app\models;
use yii\base\ActiveRecord;
class Info extends ActiveRecord {
    public function static tableName(){
        return '{{%my_post}}';
    }
}

</code></code>
Copy after login
Copy after login

然后就没有写其他的功能代码了,其他的写在这个地方似乎不合适了。

3)接到上面第2点,比如当我要实现用户的积分扣除功能。流程逻辑应该如下吧:

<code>1.先检测用户当前的积分是否充足?如果不充足失败且提示。
2.执行积分扣除
3.成功写入积分变更日志
</code>
Copy after login
Copy after login

像第3点这样的,该写在那个文件,特别让人疑惑 /models/Member.php 还是 /models/MemberQuery.php 还是 /components/Member/ScoresUse.php

4)如果真的像 【积分扣除】【用户封禁】这样的功能都制作成单独的组件components,那么ActiveRecord models那么岂不就真的就只剩下第2点里面说的这一段内容的?另外如果真的是这样,那岂不component 变得异常的庞大,但问题是执行【积分扣除】【用户封禁】这样的操作,不是单独某个表的,如果放到 /models/Member.php 里面去执行,需要调用额外的其他表,显然又不符合规范,显得很混乱。

5)比如 【积分扣除】【用户封禁】这样的操作必须可以让正在登陆用户自行调用,又可以让登陆的管理员自行登陆,所以,似乎归类到 model来说完全不适合? 归类到 component 却又还不如直接用 function 单独函数更方便?比如执行 【积分扣除变更】功能:

<code>php</code><code>/**
 * @description 操作用户积分!
 * @param $mid
 * @param $jftype
 * @param string $tips
 * @param null $jfValue2
 * @return bool
 */
function log_jifen_change($mid, $jftype, $tips = '', $jfValue2 = null)
{
    global $dsql;

    $jfvalue = $jfValue2 && is_numeric($jfValue2) ? $jfValue2 : jifen_value($jftype);

    if ($dsql->ExecuteNoneQuery2("UPDATE #@__member SET scores=scores+'$jfvalue' WHERE mid='" . $mid . "' ")) {

        $rs = $dsql->GetOne("SELECT `scores` FROM `#@__member` WHERE `mid`='{$mid}' ");
        $scoresLeft = $rs['scores'];

        $setarr = array(
            'mid'     => $mid, //会员ID
            'jftype'  => $jftype, //积分代码
            'jftime'  => time(), //操作时间
            'jfvalue' => $jfvalue, //本次变更积分
            'tips'    => $tips, //提示内容
            'jfleft'  => $scoresLeft, //剩余的积分
        );

        $dsql->ExecuteNoneQuery("INSERT INTO gk_member_jflog SET " . MkSetSql($setarr));

        return $scoresLeft;
    }

    return false;
}

</code>
Copy after login
Copy after login

PHP中什么时候该用 component 什么时候该用 model?特别让人迷惑。。。

真是,一下问这么多问题好难回答。

  1. 先说说什么时候继承 Model 什么时候继承 ActiveRecord?

当一个表单是操作多个表单的时候,建议你新建一个 From,From 只能继承 Model,每个表都要生成 Model,Model 都继承 ActiveRecord。

  1. component 与 model 的区别到底是在哪里?

我认为他们两个没什么关系啊,component 是组件,model 一般映射一个表单或者一个数据库表。

如果你的积分业务比较多,而又比较复杂你可以写成事件,其他地方调用。

最后安利一下:https://github.com/forecho/awesome-yii2

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