How to delete rows from multiple tables in one query (with left join).
The query:
DELETE `deadline`, `job` FROM `deadline` LEFT JOIN `job` ....
So, I try it like this:
DB::table('deadline', 'job')
->leftJoin('job', 'deadline.id', '=', 'job.deadline_id')
->where('deadline.id', $id)
->delete();
Seems that Laravel doesn't support delete from multiple tables with left join.
Is there a supported way or workaround?
It seems that my way is not possible. So, I did it like this.
$q = 'DELETE deadline, job FROM deadline LEFT JOIN job ...where deadline.id = ?';
$status = \DB::delete($q, array($id));
Documentation: http://laravel.com/docs/database#running-queries
DB::table(DB::raw('deadline, job')) might work. If it doesn't, you'll have to write the SQL manually and call it via DB::statement().
To make laravel allow a join in a delete is simple - you just need to change the compileDelete function in Illuminate\Database\Query\Grammars\Grammar to this:
public function compileDelete(Builder $query)
{
$table = $this->wrapTable($query->from);
$components = implode(' ', array(
is_array($query->joins) ? $this->compileJoins($query, $query->joins) : '',
is_array($query->wheres) ? $this->compileWheres($query, $query->wheres) : '',
is_array($query->limit) ? $this->compilelimit($query, $query->limit) : '',
is_array($query->offset) ? $this->compileOffset($query, $query->offset) : ''
));
return trim("delete $table from $table ".$components);
}
Then ->delete() will work the way you expect it to. I've already added this as a pull request to the laravel framework repo, so hopefully this might be merged into the next version - just have to see.
$query = 'DELETE courses,course_contents FROM courses
INNER JOIN course_contents ON course_contents.course_id = courses.id
WHERE courses.id = ?';
\DB::delete($query, array($id));
Related
I need a following code to convert to Laravel query can any one help me with these.
SELECT id, `leave_name`, `total_leave_days`, leave_id, leave_taken_days FROM `leaves` AS t1 INNER JOIN ( SELECT leave_id, SUM(`leave_taken_days`) AS leave_taken_days FROM `leave_applications` WHERE user_id = 2 AND statuses_id = 2 GROUP BY leave_id ) AS t2 ON t1.id = t2.leave_id
I even tried but the output is not showing atall.
$user_leaves = DB::table('leaves')
->select('id', 'leave_name', 'total_leave_days', 'leave_id', 'leave_taken_days')
->join('leave_application', 'leave_application.leave_id', '=', 'leave.id')
->select('leave_application.leave_id', DB::raw("SUM(leave_taken_days) as leave_application.leave_taken_days"))
->where('user_id','=', 2)
->where('statuses_id','=', 2)
->get();
How can I solve this issue?
UPDATE
Relations between two models.
Leave Model
public function leave_application()
{
return $this->belongsTo(LeaveApplication::class, 'id' , 'leave_id');
}
Leave Application Model
public function leave()
{
return $this->belongsTo(Leave::class, 'leave_id', 'id');
}
Try this :
$user_leaves = Leave::select('leaves.id', 'leaves.leave_name', 'leaves.total_leave_days', 'leave_applications.leave_id', DB::raw('SUM(leave_applications.leave_taken_days) as leave_taken_days'))
->with('leave_application')
->whereHas('leave_application', function($q) {
$q->where('user_id', 2)
->where('statuses_id', 2);
})
->groupBy('leaves.id')
->get();
On this topic I would like to give my recommendations for some tools to help you out in the future.
SQL Statement to Laravel Eloquent to convert SQL to Laravel query builder. This does a decent job at low level queries. It also saves time when converting old code.
The other tool I use to view the query that is being run is Clock Work
I keep this open in a tab and monitor slow nasty queries or, also gives me perspective on how the query builder is writing SQL. If you have not use this extension I highly recommend getting and using it.
Actually I found my answer,
$user_leaves = DB::table('leaves as t1')
->select('t1.id', 't1.leave_name', 't1.total_leave_days', 't2.leave_id', 't2.leave_taken_days')
->join(DB::raw('(SELECT leave_id, SUM(leave_taken_days) AS leave_taken_days FROM leave_applications WHERE user_id = ' . $user_id . ' AND statuses_id = 2 GROUP BY leave_id) AS t2'), function ($join) {
$join->on('t1.id', '=', 't2.leave_id');
})
->get();
You can use DB:select("your query", params) and put your query and params (as an array (optional)
As below sample:
$result = DB:select("
SELECT id, `leave_name`, `total_leave_days`, leave_id, leave_taken_days
FROM `leaves` AS t1
INNER JOIN (
SELECT leave_id, SUM(`leave_taken_days`) AS leave_taken_days
FROM `leave_applications`
WHERE user_id = 2
AND statuses_id = 2
GROUP BY leave_id
) AS t2 ON t1.id = t2.leave_id" , $params
);
return response()->json($result);
I have a two tables in my database instructors and courses . I want to join them and for this reason wrote this code
$this->db->join('instructors', 'instructors.id = courses.instructor_id', 'left');
$query = $this->db->get_where('courses', array('courses_slug' => $slug));
return $query->row_array();
This code means:
SELECT * FROM `courses` LEFT JOIN `instructors` ON `instructors`.`id` = `courses`.`instructor_id` WHERE `courses_slug` = 'abituriyent-hazirligi'
But when I write this code to check:
$data['courses'] = $this->popular_courses_model->get_popular_courses($slug);
echo $data['courses']['id'];
die();
It writes the instructors id, not id of the course. Where can be the problem? Thanks in advance.
You are joining two table with columns of the same name ('id'). You need to be specific in your select for the columns and rename ('AS') if necessary.
select courses.id as course_id, instructor.id as instructor_id, ...
When using joins you should explicitly call out what columns you want returned like:
$select = "c.id, c.name, c.instructor_id, i.name instructor_name";
return $this->db->select($select)
//equivalent to "instructors as i"
->join('instructors i', 'i.id = c.instructor_id', 'left')
->where('c.courses_slug', $slug)
//equivalent to "courses as c"
->get('courses c')->row_array();
query('SELECT * FROM answers INNER JOIN questions
WHERE answers.answerId= questions.questionId AND answers.answerId IN (' . $id . ')')
I need help to change this to active record for codeigniter.
i tried to get the values which is equal to the id form the two tables and join it. but when i tried like this
$this->db->select("*"); $this->db->join("questions","questions.questionId = answers.answerId"); $this->db->where_in('answers.answerId',$id); $res = $this->db->get("answers");
It's only displaying the first joined table passed through the id.
Try this
$this->db->select('*');
$this->db->from('answers');
$this->db->join('questions','questions.questionId=answers.answerId');
$this->db->where_in('answers.answerId',$id);
$query=$this->db->get();
$result=$query->result();
By default, its inner join
$this->db->select("*");
$this->db->join("questions","questions.questionId = answers.answerId");
$this->db->where_in('answers.answerId',$id);
$res = $this->db->get("answers");
I have been unsuccessfully trying to leftjoin and get the required data
Here is my code:
$album = Albums::->where('users_id',$user_id)
->leftJoin('photos',function($query){
$query->on('photos.albums_id','=','albums.id');
$query->where('photos.status','=',1);
//$query->limit(1);
//$query->min('photos.created_at');
})
->where('albums.status',1)->get();
The comments are some of my several trying...
I want to get only a single record from the photos table matching the foreign key album_id which was updated first and also with status 1
pls help...
I have used DB::raw() in order to achieve this
$album = Albums::select( 'albums.*',
DB::raw('(select photo from photos where albums_id = albums.id and status = 1 order by id asc limit 1) as photo') )
->where('users_id',$user_id)
->where('albums.status',1)->get();
#JarekTkaczyk 's coding was similar and displayed the same result as I needed, so a special thanks to him for his time and effort...
But comparing the execution time for the quires I stayed to mine as my above snippet
select `albums`.*, (select photo from photos where albums_id = albums.id and status = 1 order by id asc limit 1) as photo from `albums` where `users_id` = '1' and `albums`.`status` = '1'
took 520μs - 580μs
and #JarekTkaczyk 's
select `albums`.*, `p`.`photo` from `albums` left join `photos` as `p` on `p`.`albums_id` = `albums`.`id` and `p`.`created_at` = (select min(created_at) from photos where albums_id = p.albums_id) and `p`.`status` = '1' where `users_id` = '1' and `albums`.`status` = '1' group by `albums`.`id`
took 640μs - 750μs But both did the same...
You can achieve it using either leftJoin or rightJoin (but the latter would return Photo models, so probably you won't need that):
Albums::where('users_id', $user_id)
->leftJoin('photos as p', function ($q) {
$q->on('photos.albums_id', '=', 'albums.id')
->on('photos.updated_at', '=',
DB::raw('(select min(updated_at) from photos where albums_id = p.albums_id)'))
->where('photos.status', '=', 1);
})
->where('albums.status', 1)
->groupBy('albums.id')
->select('albums.*', fields from photos table that you need )
->get();
Are you trying to check for albums that have the status of '1'? If this is the case you are missing an equals sign from your final where.
Try:
->where('albums.status','=',1)->first();
Alternatively you may be able to achieve this with an 'on' instead of a 'where' inside the join function. You also don't need to split up query inside of the function and can do it as one line with the '->' :
$album = Albums::->where('users_id',$user_id)
->leftJoin('photos',function($query){
$query->on('photos.albums_id','=','albums.id')
->on('photos.status','=',1);
})
->where('albums.status','=',1)->first();
You need to make sure that you are using 'first', as it will return a single row of the first result. Get() will return an array.
As a straightforward answer which results in a single object I suggest the following query:
$album = DB::table('albums')->select('albums.*', 'photos.photo')
->join('photos', 'photos.id', '=', 'albums.id')
->where('users_id',$user_id)
->where('albums.status',1)
->first();
I have a query in a repository like :
$rsm = new ResultSetMapping;
$rsm->addEntityResult('\My\ProjectBundle\Entity\News', 't');
$rsm->addFieldResult('t', 'id', 'id');
$rsm->addMetaResult('t', 'account_id', 'account_id');
$qb = $this->_em->createNativeQuery(
'SELECT t.*
FROM news as t
LEFT JOIN
LEFT JOIN
WHERE
CONDITIONS CONDITIONS
',
$rsm
);
return $qb->getResult();
I simplified the above query which is used to retrieve the news that meet specific conditions.
I need to add a count() function to this query.
I have an other ManyToOne entity-relationship between Comment and News.
How to modify the query to get the comments number a given news has ?
I'm trying to add a left join to comment and add Count() in the select but I always get errors. How could I resolve this problem ?
Raw SQL with Doctrine is easier like this :
$em = $this->getDoctrine()->getManager()->getConnection();
$query = "
SELECT t.*
FROM news as t
LEFT JOIN
LEFT JOIN
WHERE
CONDITIONS CONDITIONS
";
$stmt = $em->prepare($query);
$stmt->execute();
$result = $stmt->fetchAll();