Yii2.0--控制层读写操作

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本文介绍Yii2.0框架中控制层的基本增删改查操作，并演示了如何实现分页显示数据，包括使用createCommand执行SQL及利用Query进行多表联查。

Yii2.0--控制层读写操作增删改查

1.查询

<span style="font-size:18px;"><span style="font-size:18px;">查询返回多行：    
$command = Yii::$app->db->createCommand('SELECT * FROM post');  
$posts = $command->queryAll();
 
返回单行
$command = Yii::$app->db->createCommand('SELECT * FROM post WHERE id=1');  
$post = $command->queryOne();
  
查询多行单值：  
$command = Yii::$app->db->createCommand('SELECT title FROM post');  
$titles = $command->queryColumn();
  
查询标量值/计算值：  
$command = Yii::$app->db->createCommand('SELECT COUNT(*) FROM post');  
$postCount = $command->queryScalar();</span></span>

2.分页

Controller：
 /** 
    *@action    yii多表链接查询后分页 
    *@----------------------------------------------------------- 
    *@ book 表和 bookpress 联查后分页 
    */  
use yii\db\Query;//调用Query方法
  public function actionShow(){
          $query = new Query();
         $list = $query->from("cart")->all();
         // var_dump($list);die;
         $pages = new Pagination([  
         'totalCount' =>count($list),
         'pageSize' =>3,//pageSize 每页显示的条数  
        ]);   
         $data = $query->offset($pages->offset)->limit($pages->limit)->all(); 
         return $this->render('show',['data'=>$data,'pages' => $pages,]);  
    }]);  
 }

<p><span style="font-size:24px;">controller:</span></p><pre><code class="hljs php"><span style="font-size:18px;"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">actionIndex</span><span class="hljs-params">()</span>
</span>{
    $query = Article::find()->where([<span class="hljs-string">'status'</span> => <span class="hljs-number">1</span>]);
    $countQuery = <span class="hljs-keyword">clone</span> $query;
    $pages = <span class="hljs-keyword">new</span> Pagination([<span class="hljs-string">'totalCount'</span> => $countQuery->count()]);
    $models = $query->offset($pages->offset)
        ->limit($pages->limit)
        ->all();

    <span class="hljs-keyword">return</span> <span class="hljs-keyword">$this</span>->render(<span class="hljs-string">'index'</span>, [
        <span class="hljs-string">'models'</span> => $models,
        <span class="hljs-string">'pages'</span> => $pages,
    ]);
}

<span style="font-size:18px;"></span></span></code><pre name="code" class="php">Model：

 /** 
    * @inheritdoc 多表联查数据 
    */  
    function pages()  
    {  
        //注意: 查询的时候不能加 all 或者 asArray 查出来是对象就可以了  
         return $this->find()  
            ->select('*')  
            ->innerJoin("`book_press` as bp on `bp`.`book_id` = `book`.`title_id`");  
            /* 此处去掉 
            ->asArray()  
            ->all(); 
            */  
    }


VIEWS:

<?php  
    use yii\helpers\Html;  
    use yii\widgets\LinkPager;  
    ?>  
    <table border=1>  
        <?php foreach ($models as $model): ?>  
            <tr>  
                <td><?= $model['title']; ?></td>  
                <td><?= $model['author']; ?></td>  
            </tr>   
        <?php endforeach; ?>  
    </table>  
      

   echo LinkPager::widget([
         'pagination' => $pages,
    ]);

//或

    <?= LinkPager::widget(['pagination' => $pages,  
        'firstPageLabel' => '首页',  
        'lastPageLabel' => '最后一页',  
        'prevPageLabel' => '上一页',  
        'nextPageLabel' => '下一页',  
        'maxButtonCount'=>5, //控制每页显示的页数  
    ]); 
   ?>

添加

//使用createCommand()进行新增数据
Yii::$app->db->createCommand()->insert('user', [  
    'name' => 'test',  
    'age' => 30,  
])->execute();

//批量插入数据
Yii::$app->db->createCommand()->batchInsert('user', ['name', 'age'], [  
    ['test01', 30],  
    ['test02', 20],  
    ['test03', 25],  
])->execute();

修改

<span style="font-size:18px;">使用createCommand()修改

Yii::$app->db->createCommand()->update('user', ['age' => 40], 'name = test')->execute();</span>

删除

<span style="font-size:18px;">使用createCommand()删除

Yii::$app->db->createCommand()->delete('user', 'age = 30')->execute();</span>

Yii2.0高级版本开发指南网址：

http://www.yii-china.com/doc/detail/1.html?postid=280

控制器跳页面操作

$this->redirect(['text/show']); // 跳转控制器

return $this->render('upda',["data"=>$data]); //跳转视图页面并传值