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();
Related
I want to join multiple tables, as in my picture:
Here is my code:
$this->db->select('
pt2.turl as `p_img`,
p.title as `p_title`,
p.text as `p_text`,
p.create as `p_date`,
pt3.turl as `c_img`,
u.name as `c_name`,
c.text as `c_text`,
c.create as `c_date`
');
$this->db->from('posts as p, users as u, photos as pt2, photos as pt3');
$this->db->join('comments as c', 'p.id=c.pid AND u.id=c.uid');
$this->db->join('posts as p2', 'p2.pid=pt2.id', 'rihgt');
$this->db->join('users as u2', 'u2.photoid=pt3.id', 'right');
$this->db->order_by('c.id', 'DESC');
$this->db->limit('7');
$qry = $this->db->get();
return $qry->result();
If I understand you correctly, this is kind of what you're looking for. I haven't tried it out so it may not be exact, but you shouldn't need to make 2 table associations (pt2 and pt3) for the same table in the join. Just Include them in the select and join on the unique ID's
The "Left" is a join that is centered around you're left table so everything hangs off of that. Since you are joining the users table before the photo table, you should be able to join on its columns.
Hope this helps. Let me know if I missed something. :)
$select = array(
pt2.turl as `p_img`,
p.title as `p_title`,
p.text as `p_text`,
p.create as `p_date`,
pt2.turl as `c_img`,
u.name as `c_name`,
c.text as `c_text`,
c.create as `c_date`
);
//Set tables to variables. Just makes it easier for me
$postsTable = "posts as p"; //This will be your left table.
$userTable = "Users as u";
$commentsTable = "comments as c";
$photosTable = "photos as pt2";
$this
->db
->select($select)
->from($postsTable)
->join($userTable, "p.uid = u.id", "left")
->join($commentsTable, "p.cid = c.id", "left")
->join($photosTable, "u.photoid = pt2.id", "left")
->get();
I solved this problem myself
It would be like this:
$select= array (
//'*',
'pt.turl p_img',
'p.title p_title',
'p.text p_text',
'p.create p_date',
'pt2.turl c_img',
'c.text c_text',
'u.name c_name',
'c.create c_date'
);
$from = array (
'posts p'
);
$qry = $this
->db
->select($select)
->from($from)
->join('comments c', 'c.pid=p.id')
->join('photos pt', 'pt.id=p.pid')
->join('users u', 'u.id=c.uid')
->join('photos pt2', 'u.photoid=pt2.id')
->order_by('c.create', 'DESC')
->limit('7')
->get();
return $qry->result();
I want to select data from 4 tables using Active Record class in codeIgniter
My tables:
Teacher(id_teacher, name)
Student(id_parent, name, id_teacher, id_class,id_school)
class(id_class, libelle)
School(id_school, name)
Here's my code :
$this->db->select("t.*, s.*, c.*, sh.*");
$this->db->from("teacher t");
$this->db->join("student s","t.id_teacher=s.id_teacher");
$this->db->join("class c","c.id_class=s.id_class");
$this->db->join("school sh","c.id_school=sh.id_school");
$query = $this->db->get();
But it's not working. Can you help me please ?
You had two from() I replaced the second from with join()
If you need a specific type of JOIN you can specify it via the third parameter of the function. Options are: left, right, outer, inner, left outer, and right outer.
public function test() {
$this->db->select("t.*, s.*, c.*, sh.*");
$this->db->from("teacher t");
// $this->db->join("student s","t.id_teacher=s.id_teacher");
$this->db->join('student s', 's.id_teacher = t.id_teacher' , 'LEFT');
$this->db->join('class c', 'c.id_class = s.id_class', 'LEFT');
// $this->db->from("school sh","c.id_school=sh.id_school");
$this->db->join('school sh' ,"sh.id_school = c.id_school", 'LEFT');
$query = $this->db->get();
return $query->result_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 a table video with fields videoid, genre(int-foreign key), language(int-foreign key) etc. I want to get the value of genre from genre table and language from movie_languages table.
The structure of tables are given below:
video
genre
movie_languages
How can I join these 3 tables to get the language and genre related to each videos in video table. Also when user didn't select genre/language in the form, value 0 will be inserted to the table. Will this affect the query. I am using codeingiter and I tried with the following query and is not working.
$this->db->select('video.*,movie_languages.language,genre.genre');
$this->db->join('genre', 'video.genre = genre.id');
$this->db->join('movie_languages', 'video.language = movie_languages.id');
$query = $this->db->get();
Please help me.
Thanks in advance.
It will be, you need a left join in this case
Try this
$query = $this->db
->select('v.*,ml.language,g.genre')
->from('video as v')
->join('movie_languages AS ml', 'v.language = ml.id', 'left outer')
->join('genre AS g', 'v.genre = g.id', 'left outer')
->get();
try this
$this->db->select('video.*,movie_languages.language,genre.genre')
->from('video')
->join('genre', 'video.genre = genre.id')
->join('movie_languages', 'video.language = movie_languages.id');
$query = $this->db->get();
I have the following query:
$this->db
->select('SQL_CALC_FOUND_ROWS null as rows
,table1.*
,table2.*
,table3.*', FALSE)
->from('table1')
->where('table1.column1', $user_id)
->join('table2', 'table2.column2 = table1.column2')
->join('table3', 'table3.column2 = table1.column2')
->group_by('table1.column2')
->order_by('table1.column2', 'DESC');
$query = $this->db->get();
The problem is, there may not be a row in table 3 and if there is not, I would still like to return a result with the remainder of the query data. Please could someone advise how to achieve this?
you should do a left join on table3
Use left join and also use group_by to get exact records:
$this->db->join('login_ranknames AS t4', 't4.id = t1.rank', 'left');
$this->db->group_by('t4.id');