Passing a variable through raw sql - Yii - php

Question

I am currently trying to pass through a variable to act like a where clause so I can pass it to the URL and display content for each event on a page.
To do this, I'd need to pass the event_id.
public function exportSearch($event_id){
$query = "SELECT
u.prefix AS 'Title',
u.forename AS 'Forename',
u.surname AS 'Surname',
u.telephone AS 'Mobile Number',
u.email AS 'Email Address',
ea.checkin_status_id AS 'checked in',
u.update_time AS 'Register Date',
eg.name AS 'Event Group Registered',
e.name AS 'Session Registered',
u.bio AS 'User Information',
u.dob AS 'Date of Birth',
u.company AS 'Company',
u.company_role AS 'Company Role',
CONCAT(u2.forename, ' ', u2.surname) AS 'Guest of',
MAX(CASE WHEN uv.user_type_variables_id = 1 THEN uv.value ELSE NULL END) AS Question1,
MAX(CASE WHEN uv.user_type_variables_id = 2 THEN uv.value ELSE NULL END) AS Question2,
MAX(CASE WHEN uv.user_type_variables_id = 3 THEN uv.value ELSE NULL END) AS Question3,
MAX(CASE WHEN uv.user_type_variables_id = 4 THEN uv.value ELSE NULL END) AS Question4,
MAX(CASE WHEN uv.user_type_variables_id = 5 THEN uv.value ELSE NULL END) AS Question5,
MAX(CASE WHEN uv.user_type_variables_id = 6 THEN uv.value ELSE NULL END) AS Question6
FROM tbl_event_attendees AS ea
LEFT JOIN tbl_user AS u ON ea.user_id = u.id
LEFT JOIN tbl_event AS e ON ea.event_id = e.id
LEFT JOIN tbl_event_groups AS eg on e.group_id = eg.id
LEFT JOIN tbl_user AS u2 ON ea.guest_of_user_id = u2.id
LEFT JOIN tbl_user_variables AS uv on u.id = uv.user_id
GROUP BY ea.id";
// $query->params([':event_id' => $event_id]);
$count=Yii::app()->db->createCommand($query)->queryScalar();
return $sqlDataprovider = new CSqlDataProvider($query, array(
'totalItemCount'=>$count,
'sort'=>array(
'attributes'=>array(
// 'event_name'=>Event::model()->getAttributeLabel('name'), // csv of sortable column names
//'Question1' => EventAttendees::model()->getAttributeLabel('Question1'),
// 'Forename',
)
),
'pagination'=>array(
'pageSize'=>$count, //Show all records
),
));
}
My idea was to use $query->params to do this and then throw it over to the view but had no luck.
It needs to display something like WHERE ea.event_id = $event_id but I can't seem to pass it through via the raw sql.

Answer 1

You need to add WHERE clause in your SQL like that:
WHERE ea.event_id = :event_id. Remember, your $query variable only contains SQL, so this is a string, not a something-like query object.
To pass parameter to queryScalar() function you need to pass an array which contains params. According to queryScalar() documentation:
$count = Yii::app()->db->createCommand($query)->queryScalar(array(
':event_id'=>$event_id
));
NOTE:
Documentation says:
Executes the SQL statement and returns the value of the first column
in the first row of data. This is a convenient method of query when
only a single scalar value is needed (e.g. obtaining the count of the
records).
So, your first column is u.prefix AS 'Title' is string. Using it as $count its not a good solution. I suggest to write one SQL for getting count of rows, and other for getting data that will be passed to CSqlDataProvider.

Answer 2

The sql should be this
"SELECT
u.prefix AS 'Title',
u.forename AS 'Forename',
u.surname AS 'Surname',
u.telephone AS 'Mobile Number',
u.email AS 'Email Address',
ea.checkin_status_id AS 'checked in',
u.update_time AS 'Register Date',
eg.name AS 'Event Group Registered',
e.name AS 'Session Registered',
u.bio AS 'User Information',
u.dob AS 'Date of Birth',
u.company AS 'Company',
u.company_role AS 'Company Role',
CONCAT(u2.forename, ' ', u2.surname) AS 'Guest of',
MAX(CASE WHEN uv.user_type_variables_id = 1 THEN uv.value ELSE NULL END) AS Question1,
MAX(CASE WHEN uv.user_type_variables_id = 2 THEN uv.value ELSE NULL END) AS Question2,
MAX(CASE WHEN uv.user_type_variables_id = 3 THEN uv.value ELSE NULL END) AS Question3,
MAX(CASE WHEN uv.user_type_variables_id = 4 THEN uv.value ELSE NULL END) AS Question4,
MAX(CASE WHEN uv.user_type_variables_id = 5 THEN uv.value ELSE NULL END) AS Question5,
MAX(CASE WHEN uv.user_type_variables_id = 6 THEN uv.value ELSE NULL END) AS Question6
FROM tbl_event_attendees AS ea
LEFT JOIN tbl_user AS u ON ea.user_id = u.id
LEFT JOIN tbl_event AS e ON ea.event_id = e.id
LEFT JOIN tbl_event_groups AS eg on e.group_id = eg.id
LEFT JOIN tbl_user AS u2 ON ea.guest_of_user_id = u2.id
LEFT JOIN tbl_user_variables AS uv on u.id = uv.user_id
WHERE ea.id = " . $event_id . "
GROUP BY ea.id"