mactron Posted February 24, 2020 Share Posted February 24, 2020 Me again.. I'm fetching data from MySQL but each person in people.php is displayed two times instead one.. The issue must be inside models_category_tbl table, because each person have more then one result. Any advice is appreciated. What should I do? I would like to display people something like that: 1 John Doe 1 IT developer, 3 mechanic models/model = person category = occupation/skills MySQL: model_index table +---------+------------+-------------+-------------------+---------------+----------------+ |model_id | model_name | model_title | model_description | model_country | model_slug | +---------+------------+-------------+-------------------+---------------+----------------+ | 1 | John Doe | Johns title | Johns desc | Hungary | john-doe | +---------+------------+-------------+-------------------+---------------+----------------+ models_category_tbl table +-------------+---------------------+---------------------+ | category_id | model_category_name | model_category_slug | +-------------+---------------------+---------------------+ | 1 | it developer | it-developer | | 2 | photographer | photographer | | 3 | mechanic | mechanic | +-------------+---------------------+---------------------+ models_category_ids table +----+----------+-------------+ | id | model_id | category_id | | 1 | 1 | 1 | | 1 | 1 | 3 | +----+----------+-------------+ PHP function to fecth data: public function getAllModels1 () { $sql = "SELECT * FROM models_index JOIN models_category_ids ON models_index.model_id=models_category_ids.model_id JOIN models_category_tbl ON models_category_tbl.category_id=models_category_ids.category_id" ; $stmt = $this->conn->prepare($sql); $stmt->execute(); $result = $stmt->fetchAll((PDO::FETCH_OBJ)); return $result; } people.php <?php declare(strict_types=1); ob_start(); include "includes/connect.php"; include "includes/functions.php"; $model = new ModelsData(); $models = $model->getAllModels1(); foreach ($models as $model) { ?> <a href="model.php?id=<?= $model->model_id ?>"><img src="<?= $model->model_img_path ?><?=$model->model_img_name ?>"></a> <?php echo $model->model_id . " " . $model->model_name . " " . $model->category_id . " " . $model->model_category_name ; ?> <h3><?= $model->model_name ?></h3> <?php } ?> Output: 1 John Doe 1 IT developer 1 John Doe 3 mechanic Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/ Share on other sites More sharing options...
mactron Posted February 24, 2020 Author Share Posted February 24, 2020 Should I write another query for categories? Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574862 Share on other sites More sharing options...
Barand Posted February 24, 2020 Share Posted February 24, 2020 One way is with GROUP_CONCAT() SELECT i.model_name , GROUP_CONCAT(c.category_id,' ',c.model_category_name SEPARATOR ', ') as cats FROM model_index i JOIN models_category_ids USING (model_id) JOIN models_category_tbl c USING (category_id) GROUP BY i.model_id; Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574863 Share on other sites More sharing options...
mactron Posted February 24, 2020 Author Share Posted February 24, 2020 Now I'm getting error in PHP:: Notice: Undefined property: stdClass::$category_id in C:\laragon\www\sys\admin\people.php on line 19 Notice: Undefined property: stdClass::$model_category_name in C:\laragon\www\sys\admin\people.php on line 19 Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574864 Share on other sites More sharing options...
Barand Posted February 24, 2020 Share Posted February 24, 2020 Which is line 19? Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574867 Share on other sites More sharing options...
mactron Posted February 24, 2020 Author Share Posted February 24, 2020 echo $model->category_id . " " . $model->model_category_name ; ?> Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574868 Share on other sites More sharing options...
Barand Posted February 24, 2020 Share Posted February 24, 2020 3 hours ago, Barand said: SELECT i.model_name , GROUP_CONCAT(c.category_id,' ',c.model_category_name SEPARATOR ', ') as cats My query returns two output columns model_name cats Try echo model->model_name . " " . $model->cats . "<br>"; (of course, without seeing the code that actually runs the query and gets the results, that's just a guess.) 1 Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574869 Share on other sites More sharing options...
mactron Posted February 24, 2020 Author Share Posted February 24, 2020 Works like a charm, but I can't set the link pointed to the each category based on category id. Among GROUP_CONCAT(), what is another way to resolve the issue? I would be thankful to you if you could provide me some reference. Thanks!! Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574872 Share on other sites More sharing options...
Barand Posted February 24, 2020 Share Posted February 24, 2020 4 hours ago, mactron said: <a href="model.php?id=<?= $model->model_id ?>"><img src="<?= $model->model_img_path ?><?=$model->model_img_name ?>"></a> The link in your code is to the model_id Add "i.model_id" to the selected columns in the query, then the output will have $model->model_id If you need individual category_ids, revert your query to that getting several rows for each model and store the results in an array, indexed by model, so each model has an array of categories. Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574873 Share on other sites More sharing options...
mactron Posted February 24, 2020 Author Share Posted February 24, 2020 Yes I know, but I would like to link to categories also... Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574876 Share on other sites More sharing options...
Barand Posted February 24, 2020 Share Posted February 24, 2020 51 minutes ago, Barand said: If you need individual category_ids, revert your query to that getting several rows for each model and store the results in an array, indexed by model, so each model has an array of categories. E.G. $res = $conn->query("SELECT i.model_id , i.model_name , c.category_id as cat_id , c.model_category_name as cat_name FROM model_index i JOIN models_category_ids USING (model_id) JOIN models_category c USING (category_id) "); $data = []; foreach ($res as $r) { if (!isset($data[$r['model_id']])) { $data[$r['model_id']] = [ 'name' => $r['model_name'], 'cats' => [] ]; } $data[$r['model_id']]['cats'][$r['cat_id']] = $r['cat_name']; } /* $data = Array ( [1] => Array ( [name] => John Doe [cats] => Array ( [1] => IT Devloper [3] => Mechanic ) ) [2] => Array ( [name] => Laura Norder [cats] => Array ( [2] => Photographer ) ) ) */ 1 Quote Link to comment https://forums.phpfreaks.com/topic/310126-multiple-returns-from-a-fetch/#findComment-1574877 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.