Symfony3 - create join query of two tables in controller - php

Question

How to show two tables data from my controller.
Here is my controller's code.
class TestController extends Controller
{
public function showAction(Request $request)
{
$em = $this->getDoctrine()->getManager();
$teacher = $this->getDoctrine()->getRepository(Teacher::class);
$query = $em
->createQueryBuilder('t')
->from('AppBundle:Teacher','t')
->Join('AppBundle:Student','s')
->where('t.id=id and s.tid=tid')
->getQuery()
->getResult();
}
}
When print_r it's showing only one table data.
Please help

Answer 1

Please check below mentioned solution.
$query = $em
->createQueryBuilder('t.*,s.*')
->from('AppBundle:Teacher','t')
->Join('AppBundle:Student','s')
->where('t.id=id and s.tid=tid')
->getQuery()
->getResult();
}
Let me know if it not works.

Answer 2

I assume that you have defined a relationship between Teacher and Student in your entities. In this case you can get the Student objects by calling $teacher->getStudents() (assuming that you have defined such a method in your Teacher entity class). See Doctrine documentation about association mapping
Example for a One-To-Many relationship:
<?php
use Doctrine\Common\Collections\ArrayCollection;
/** #Entity */
class Teacher
{
// ...
/**
* One Teacher has Many Students.
* #OneToMany(targetEntity="Student", mappedBy="teacher")
*/
private $students;
// ...
public function __construct() {
$this->students = new ArrayCollection();
}
}
/** #Entity */
class Student
{
// ...
/**
* Many Students have One Teacher.
* #ManyToOne(targetEntity="Teacher", inversedBy="students")
* #JoinColumn(name="teacher_id", referencedColumnName="id")
*/
private $teacher;
// ...
}
In the QueryBuilder object you can avoid the need of additional queries on $teacher->getStudents() calls by adding something like that:
$query = $em
->createQueryBuilder('t')
->from('AppBundle:Teacher','t')
->join('AppBundle:Student','s')
->select(array('t', 's'))
->where('t.id=id and s.tid=tid')
->getQuery()
->getResult();
}
If there is a relationship defined between Teacher and Student in your entities as mentioned above you can even simplify the join:
$query = $em
->createQueryBuilder('t')
->from('AppBundle:Teacher','t')
->join('t.students', 's')
->select(array('t', 's'))
->getQuery()
->getResult();
}
Furthmore you do not need to call the from() method if you create the QueryBuilder object via the TeacherRepository object:
$query = $teacher
->createQueryBuilder('t')
->join('t.students', 's')
->select(array('t', 's'))
->getQuery()
->getResult();
}

Answer 3

$query = $em
->createQueryBuilder('t')
->add('select', 't,s')
->from('AppBundle:Teacher', 't')
->Join('AppBundle:Student', 's')
->where('t.id = s.tid')
->getQuery()
->getResult();
it working perfect.

Answer 4

First we select all from Teachers table, then join students. Assume that your relationship name in Teachers model is student. In repository file:
public function getWithStudents() {
return $this->createQueryBuilder('t')
->Join('t.student', 's')
->addSelect('s')
->getQuery()->getArrayResult();
}
Then in controller call it:
$teachersWithStudents = $teacher->getWithStudents();
Or in this case you can just
$teachersWithStudents = $teacher->getStudents();

Answer 5

Suppose you have two tables.comment table and article table and You want to fetch comments on each article
$commentContent = $em
// automatically knows to select Comment
// the "c" is an alias you'll use in the rest of the query
->createQueryBuilder('c')
->select('c.message, c.name')////Fields required to display
->from('AppBundle:Comment','c')
->join('AppBundle:Article','a')
->where('c.idArticle=a.id and c.publish_mainPage = 1')
->orderBy('c.idArticle', 'DESC')
->getQuery()
->getResult();
var_dump($commentContent);