CSqlDataProvider复杂查询和totalItemCount

Question

I have a very complex query using CSqlDataProvider and I'm trying to get the pagination totalItemCount to work, but it's returning wrong count. I tried to create a second SQL just to COUNT items, but it's really hard, can anyone help me?

CSqlDataProvider Docs: http://www.yiiframework.com/doc/api/1.1/CSqlDataProvider

Controller Code:

    $dayofweek = date('w');     

    $sql = "( SELECT `profile`.`id` as profile_id, `profile`.`name` as profile_name, `events_reminder`.`id`,
                CASE WHEN weekday >= $dayofweek
                    THEN 
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL weekday - $dayofweek DAY), ' ', event_time ), '%d/%m/%Y %H:%i')
                    ELSE
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL 7 - $dayofweek + weekday DAY), ' ', event_time ), '%d/%m/%Y %H:%i')
                    END as revent_datetime,
                CASE WHEN weekday >= $dayofweek
                    THEN 
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL weekday - $dayofweek DAY), ' ', list_time ), '%d/%m/%Y %H:%i')
                    ELSE
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL 7 - $dayofweek + weekday DAY), ' ', list_time ), '%d/%m/%Y %H:%i')
                    END as rlist_datetime
                FROM events_reminder
                LEFT OUTER JOIN `profiles` `profile` ON (`events_reminder`.`profile_id`=`profile`.`id`)
                HAVING revent_datetime NOT IN (SELECT DATE_FORMAT(event_datetime, '%d/%m/%Y %H:%i') FROM events WHERE `events`.`profile_id`=`events_reminder`.`profile_id`) )
            UNION ALL
            ( SELECT `profile`.`id` as profile_id, `profile`.`name` as profile_name, `events_reminder`.`id`,
                CASE WHEN weekday >= $dayofweek
                    THEN 
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL weekday - $dayofweek + 7 DAY), ' ', event_time ), '%d/%m/%Y %H:%i')
                    ELSE
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL 7 - $dayofweek + weekday + 7 DAY), ' ', event_time ), '%d/%m/%Y %H:%i')
                    END as revent_datetime,
                CASE WHEN weekday >= $dayofweek
                    THEN 
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL weekday - $dayofweek + 7 DAY), ' ', list_time ), '%d/%m/%Y %H:%i')
                    ELSE
                        DATE_FORMAT( CONCAT( DATE_ADD(CURDATE(), INTERVAL 7 - $dayofweek + weekday + 7 DAY), ' ', list_time ), '%d/%m/%Y %H:%i')
                    END as rlist_datetime
                FROM events_reminder
                LEFT OUTER JOIN `profiles` `profile` ON (`events_reminder`.`profile_id`=`profile`.`id`)
                HAVING revent_datetime NOT IN (SELECT DATE_FORMAT(event_datetime, '%d/%m/%Y %H:%i') FROM events WHERE `events`.`profile_id`=`events_reminder`.`profile_id`) )
                ORDER BY revent_datetime";

    $count=Yii::app()->db->createCommand($sql)->queryScalar();

    $dataProvider=new CSqlDataProvider($sql, array(
        'totalItemCount'=>$count,
    ));

    $this->render('index',array(
        'dataProvider'=>$dataProvider,
    ));

Answer 1

What queryScalar does is:

Executes the SQL statement and returns the value of the first column in the first row of data.

So to use it for getting count you will have to add a count(*) to your sql query, that too in the beginning of the query, like this:

SELECT count(*), `profile`.`id` as profile_id, `profile`.`name` ...

Update:

Since you are using UNION you have to move the count(*) outside, also give an alias:

SELECT count(*) from (((select ...) UNION ALL (select ...)) as alias)

For your exact situation you can do:

$count_sql='SELECT count(*) from (('. $sql .') as alias)';
$count=Yii::app()->db->createCommand($count_sql)->queryScalar();