I have a db with "user_name" and "posts". How can I get a count of posts per username using CodeIgniter's db class?
In SQL:
SELECT
user_name,
COUNT(1) as post_count
FROM posts_by_user
GROUP BY user_name
In CodeIgniter:
$this->db->select('user_name', ???????);
$this->db->from('posts_by_user');
$this->db->group_by('user_name');
$result = $this->db->query();
Try
$this->db->select('user_name, COUNT(*) as cnt', FALSE);
$this->db->from('posts_by_user');
$this->db->group_by('user_name');
$result = $this->db->get();
return $result->result();
Related
Laravel DB::select returns
General error: 2031
It looks like quotes are not added to the statement and it tries to execute the statement like this:
$sql = 'SELECT id FROM users where email=email#email.com';
The code looks like this:
$sql = 'SELECT id FROM users where email=?';
$results = DB::select($sql, ['email' => $email]);
I thought this is handled automatically by PDO but do I need to add anything to the code above so the statement looks like?
$sql = 'SELECT id FROM users where email="email#email.com"';
I recommend you to read the select docs from Laravel Query Builder.
The Query Builder provides a complete API to make it easier and safer. Your query would look like:
$results = DB::table("users")->select("id")->where("email",$email);
EDIT
The problem is that you're trying to pass a named parameter, but inside the string you didn't named it.
As the doc example shows:
$results = DB::select('select * from users where id = :id', ['id' => 1]);
Your query should look like:
$sql = 'SELECT id FROM users where email=:email';
$results = DB::select($sql, ['email' => $email]);
#mthrsj has correctly identified a better solution in your particular query.
Your underlying issue with the DB::select call is you're using non-named placeholders ? while passing it named data.
This should work:
$sql = 'SELECT id FROM users where email=?';
$results = DB::select($sql, [$email]);
as should this:
$sql = 'SELECT id FROM users where email=:email';
$results = DB::select($sql, ['email' => $email]);
If you have models setup, you can also call the DB using your User model:
$user = User::select('id')->where('email', $email)->get();
This uses Eloquent, which uses PDO.
How to use Below query in Codeigniter
SELECT * FROM (post) JOIN user ON user.user_id=post.user_id JOIN friend ON (friend.user_id=post.user_id AND friend.friendship_id=1) OR (friend.user_id=1 ANDfriend.friendship_id=post.user_id) WHERE post.type = 'friend' ORDER BY postid desc
You can use this.
$this->db->query(your query);
like this code.
$sql = "SELECT * FROM table WHERE user_id = 1";
$this->db->query($sql);
try this
$query = $this->db
->select('*')
->from('post')
->join('user', 'user.user_id = post.user_id')
->join('friend', 'friend.user_id = (post.user_id AND friend.friendship_id=1) OR (friend.user_id = 1 AND friend.friendship_id = post.user_id)')
->where('post.type', 'friend')
->order_by('postid','DESC')
->get();
$arrResult = $query->result();
I don't understand how to convert this query into codeigniter linq
SELECT prdctSubCatId
FROM productinfo
WHERE prdctSubCatId = (
SELECT prdctSubCatId
FROM productinfo
WHERE id='27'
)
Instead of id ='27' I want to pass id=$id, then how can I do this
$this->db->select('prdctSubCatId')->from('productinfo');
$this->db->where('`prdctSubCatId`= (SELECT `prdctSubCatId` FROM `productinfo` WHERE id=27 )', NULL, FALSE);
$this->db->select('prdctSubCatId');
$this->db->where('id',27);
return $this->db->get('productinfo')->result_array();
Simply use
$query = $this->db->query("SELECT prdctSubCatId FROM productinfo WHERE prdctSubCatId=27");
$result = $query->result_array();
return $result;
It seems Laravel pagination does not working properly with group by clause. For example:
$users = Subject::select(DB::raw('subjects.*, count(user_subjects.id) as total_users'))
->join('user_subjects', 'user_subjects.subject_id', '=', 'subjects.id')
->whereNull('user_subjects.deleted_at')
->groupBy('subjects.id')
->orderBy('subjects.updated_at', 'desc')
->paginate(25);
Produced
select subjects.*, count(user_subjects.id) as total_users
from `subjects` inner join `user_subjects` on `user_subjects`.`subject_id` = `subjects`.`id`
where `subjects`.`deleted_at` is null and `user_subjects`.`deleted_at` is null
group by `subjects`.`id`
order by `subjects`.`updated_at` desc
note that, there is no limit clause on the query.
Working fine if no group by clause in the query:
$users = Subject::select(DB::raw('subjects.*, count(user_subjects.id) as total_users'))
->join('user_subjects', 'user_subjects.subject_id', '=', 'subjects.id')
->whereNull('user_subjects.deleted_at')
->orderBy('subjects.updated_at', 'desc')
->paginate(25);
produced the following query:
select subjects.*, count(user_subjects.id) as total_users from `subjects`
inner join `user_subjects` on `user_subjects`.`subject_id` = `subjects`.`id`
where `subjects`.`deleted_at` is null and `user_subjects`.`deleted_at` is null
order by `subjects`.`updated_at` desc
limit 25 offset 0
does anyone has any idea how can i fix this?
Check the documentation
https://laravel.com/docs/5.2/pagination
Currently, pagination operations that use a groupBy statement cannot
be executed efficiently by Laravel. If you need to use a groupBy with
a paginated result set, it is recommended that you query the database
and create a paginator manually.
I know it is an old question, by I am sharing my solution for future reference.
I managed to write a function based on this link which does the heavy job of determining the pagination of a complex query. Just pass the 'QueryBuilder' and it will return the paginated object/collection.
Additionally, this procedure can track and maintain the other parameters except for page=.
public function mergeQueryPaginate(\Illuminate\Database\Eloquent\Builder $query): \Illuminate\Pagination\LengthAwarePaginator
{
$raw_query = $query;
$totalCount = $raw_query->get()->count();
$perPage = request('per-page', 10);
$page = request('page', 1);
$skip = $perPage * ($page - 1);
$raw_query = $raw_query->take($perPage)->skip($skip);
$parameters = request()->getQueryString();
$parameters = preg_replace('/&page(=[^&]*)?|^page(=[^&]*)?&?/', '', $parameters);
$path = url(request()->getPathInfo() . '?' . $parameters);
$rows = $raw_query->get();
$paginator = new LengthAwarePaginator($rows, $totalCount, $perPage, $page);
$paginator = $paginator->withPath($path);
return $paginator;
}
This works for me in laravel 5.2
Select(\DB::RAW("assignment_descendant_child.assignment_descendant_child_id, assignment_descendant_child.assignment_descendant_child_name, COUNT(assignment_descendant.assignment_descendant_id) as xNum"))
->leftJoin(
'assignment_descendant',
'assignment_descendant.assignment_descendant_child_id',
'=',
'assignment_descendant_child.assignment_descendant_child_id'
)
->orderBy('assignment_descendant_child_name')
->groupBy('assignment_descendant_child.assignment_descendant_child_id')
->paginate(\Config::get('constants.paginate_org_index'))
create a database view namedvw_anything. MySql query will be like
create view vw_anything as select subjects.*, count(user_subjects.id) as total_users from subjects inner join user_subjects on user_subjects.subject_id = subjects.id
where subjects.deleted_at is null and user_subjects.deleted_at is null group by subjects.id;
Now create a new model named UserSubModel for this view, protected $table = 'vw_anything';
Now your paginate query will be like UserSubModel::orderBy('subjects.updated_at', 'desc')->paginate(25);
.
To answer this questioin Laravel Pagination group by year and month only
View query will be :
create view vw_anything as select gallery.*, DATE_FORMAT(created_at, "%Y-%m") as tanggal,count(created_at) as jumlah from gallery group by tanggal;
Let you model is VwModel then your paginate query will be
VwModel::where('type','Foto')->orderBy('tanggal','desc')->paginate(2);
This works if you want to group by and paginate.
$code = DB::table('sources')
->select(DB::raw('sources.id_code,sources.title,avg(point) point'))
->join('rating','sources.id_code','rating.id_code')
->groupBy('sources.id_code')
->groupBy('sources.title')
->groupBy('sources.language')
->groupBy('sources.visited')
->paginate(5);
I would like to know if this SQL statement is done in Codeigniter active record.
SELECT * FROM (
SELECT *
FROM chat
WHERE (userID = $session AND toID = $friendID)
OR (userID = $friendID AND toID = $session)
ORDER BY id DESC
LIMIT 10
) AS `table` ORDER by id ASC
You have to use the _compile_select() and _reset_select() methods of the active record class.
$this->db->select('*');
$this->db->from('chat');
$this->db->where("(userID='{$session}' AND toID='{$friendID}')");
$this->db->or_where("(userID='{$friendID}' AND toID='{$session}')");
$this->db->order_by('id', 'DESC');
$this->db->limit('10');
$subQuery = $this->db->_compile_select();
$this->db->_reset_select();
$this->db->select('*');
$this->db->from("{$subQuery} AS table");
$this->db->order_by('id', 'ASC');
$query = $this->db->get();
Unfortunately, in CI 2.0+, _compile_select() and _reset_select() are protected methods. Bummer. You'll have to follow this tutorial on extending the DB driver where you can write methods like the following:
function get_compiled_select()
{
return $this->db->_compile_select();
}
function do_reset_select()
{
$this->db->_reset_select();
}
I would like to take the time to point out that this type of action would be better served by joins. You should consider changing your db structure so that joins are possible and efficient.
This will work, though is not the active record variant.
$this->db->query( "SELECT * FROM (
SELECT *
FROM chat
WHERE (userID = ? AND toID = ?)
OR (userID = ? AND toID = ?)
ORDER BY id DESC
LIMIT 10
) AS `table` ORDER by id ASC", array( $session, $friendID, $friendID, $session) );"
You can use query as:
$this->db->select('SELECT *
FROM chat
WHERE (userID = $session AND toID = $friendID)
OR (userID = $friendID AND toID = $session)
ORDER BY id DESC
LIMIT 10') AS `table` ORDER by id ASC', FALSE);