Question

这是我的代码。我想从两列中选择一个结果。感谢。

   $messages = (new \yii\db\Query())
               ->select(['idsender as idotherguy'])
               ->from('messages')
               ->where(['idreceiver' => Yii::$app->user->identity->id])
               ->all(); 
    $messages2 = (new \yii\db\Query())
               ->select(['idreceiver as idotherguy'])
               ->from('messages')
               ->where(['idsender' => Yii::$app->user->identity->id])
               ->all(); 
    $messages->union($messages2);

经过这里的建议，我也试过了......

    $messages = (new \yii\db\Query())
               ->select(['idsender as idotherguy'])
               ->from('messages')
              ->where(['idreceiver' => Yii::$app->user->identity->id]);

    $messages2 = (new \yii\db\Query())
               ->select(['idreceiver '])
               ->from('messages')
              ->where(['idsender' => Yii::$app->user->identity->id]);

    $messages->union($messages2);
    $messages->all();

我得到了查询对象

      yii\db\Query Object

（ [select] =＆gt;排列（ [0] =＆gt; idsender as idotherguy ）

[selectOption] => 
[distinct] => 
[from] => Array
    (
        [0] => messages
    )

[groupBy] => 
[join] => 
[having] => 
[union] => Array
    (
        [0] => Array
            (
                [query] => yii\db\Query Object
                    (
                        [select] => Array
                            (
                                [0] => idreceiver as idotherguy
                            )

                        [selectOption] => 
                        [distinct] => 
                        [from] => Array
                            (
                                [0] => messages
                            )

                        [groupBy] => 
                        [join] => 
                        [having] => 
                        [union] => 
                        [params] => Array
                            (
                            )

                        [_events:yii\base\Component:private] => Array
                            (
                            )

                        [_behaviors:yii\base\Component:private] => 
                        [where] => Array
                            (
                                [idsender] => 2
                            )

                        [limit] => 
                        [offset] => 
                        [orderBy] => 
                        [indexBy] => 
                        [emulateExecution] => 
                    )

                [all] => 
            )

    )

[params] => Array
    (
    )

[_events:yii\base\Component:private] => Array
    (
    )

[_behaviors:yii\base\Component:private] => 
[where] => Array
    (
        [idreceiver] => 2
    )

[limit] => 
[offset] => 
[orderBy] => 
[indexBy] => 
[emulateExecution] =>

）

就是这样......我也尝试过回答并用于选择'idreceiver as idotherguy'......但结果是相同的

Answer 1

您应该避免联合查询中的别名，使用文字选择格式并仅将结果应用于结果

  $messages = (new \yii\db\Query())
             ->select('idsender as idotherguy')
             ->from('messages')
             ->where(['idreceiver' => Yii::$app->user->identity->id]); 

  $messages2 = (new \yii\db\Query())
             ->select('idreceiver')
             ->from('messages')
             ->where(['idsender' => Yii::$app->user->identity->id]); 

  $messages->union($messages2);
  $messages->all();

查看你应该

的结果

 foreach($messages as $key=> $value) {

   echo $value->idotherguy;
 }

或者结果是数组

  foreach($messages as $key=> $value) {

    echo $value['idotherguy'];
 }

尝试以这种方式检查ral sql代码（而不是$ messages-＆gt; all（）;）

var_dump( $messages->createCommand()->sql);

Answer 2

查看文档http://www.yiiframework.com/doc-2.0/guide-db-query-builder.html#union，您的查询中不应该有$messages = (new \yii\db\Query()) ->select(['idsender as idotherguy']) ->from('messages') ->where(['idreceiver' => Yii::$app->user->identity->id]); $messages2 = (new \yii\db\Query()) ->select(['idreceiver as idotherguy']) ->from('messages') ->where(['idsender' => Yii::$app->user->identity->id]); $messages->union($messages2); $messages->all();

function getvalHT(sel) {
    var selectedFromHours   = $('#RoomFromTimeH').val();
    var selectedToHours     = $('#RoomToTimeH').val();

    console.log(selectedFromHours);
    console.log(selectedToHours);

    var selectedFromMin     = $('#RoomFromTimeM').val();
    var selectedToMin       = $('#RoomToTimeM').val();

    if(selectedFromHours > selectedToHours) {
        $("#savebutton").show(); 
    }else {
        $.alert({
            title: 'Time period error!',
            content: 'The "From" hours time of ' + $('#RoomFromTimeH').val() + '<BR/><BR/> must be less than<BR/><BR/> the "To" hours time of ' + $('#RoomToTimeH').val() + '.',
            icon: 'fa fa-rocket',
            animation: 'zoom',
            boxWidth: '50%',
            closeAnimation: 'zoom',
            buttons: {
             okay: {
                text: 'Try again',
                btnClass: 'btn-blue'
             }
            },

                cancel: function () {
                 $.alert('canceled');
            }
       });
        $("#savebutton").hide();  // any other condition hide the button
        $('#RoomFromTimeH').prop('selectedIndex',0);
        $('#RoomToTimeH').prop('selectedIndex',0);
        $('#RoomFromTimeM').prop('selectedIndex',0);
        $('#RoomToTimeM').prop('selectedIndex',0);
    }
}

Answer 3

我改变了这里提供的代码，现在工作正常....

   $messages = (new \yii\db\Query())
               ->select(['idsender as idotherguy'])
               ->from('messages')
               ->where(['idreceiver' => Yii::$app->user->identity->id]);
    $messages2 = (new \yii\db\Query())
               ->select(['idreceiver as idotherguy'])
               ->from('messages')
              ->where(['idsender' => Yii::$app->user->identity->id]);
    $messages = $messages->union($messages2)
                ->all();

结果现在是带有我想要的值的数组。排列（ [0] =＆gt;排列（ [idotherguy] =＆gt; 3 ）

[1] => Array
    (
        [idotherguy] => 11
    )

[2] => Array
    (
        [idotherguy] => 10
    )

）

感谢帮助男孩：）

Yii2 QueryBuilder联合不起作用

3 个答案: