symfony 2 Doctrine leftJoin NOT IN - symfony

Question

How can I solve a query where I want to get all data from the left table which isn't existing in the right table?
left table: ID | NAME | DATE
right table: ID | ID_left_table | NAME | DATE
It is confusing me a bit since I haven't got that experience with doctrine.
My entitys look like:
class NameData
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255, nullable=false)
*/
private $name;
/**
* #var \DateTime
*
* #ORM\Column(name="date", type="datetime")
*/
private $date;
.
.
.
and
class ValueData
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="TestBundle\Entity\NameData")
*/
private $nameid;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255, nullable=false)
*/
private $name;
/**
* #var \DateTime
*
* #ORM\Column(name="date", type="datetime")
*/
private $date;
.
.
.

Answer 1

1) First of all, fix $nameid property annotation in ValueData entity to this:
/**
* #ORM\ManyToOne(targetEntity="NameData")
* #ORM\JoinColumn(name="name_id", referencedColumnName="id")
**/
private $nameData;
This is basic Doctrine annotation mapping for relationships, in this case ManyToOne.
2) Modify valueData table to add foreign key, by typing php app/console doctrine:schema:update --force or with migrations
3) let Symfony generate the right setters and getters for ValueData entity, by running command in your console php app/console doctrine:generate:entities TestBundle:ValueData.
4) And then, if you need to get data in controller:
$valueData = $this->getDoctrine()->getRepository('TestBundle:ValueData')->find(1);//Find by ID 1 OR ->findAll() to get all records
$nameData = $valueData->getNameData(); //This line of code behind the scenes will
//join the valueData table with nameData, and get associated data
Add a comment if you will need help along the way.
Edit:
Below is the query builder to select all NameDatas which dont have any ValueData:
$nameDataRepo = $this->getDoctrine()->getRepository('TestBundle:NameData');
$nameDatasWithoutDatavalues = $nameDataRepo->createQueryBuilder('nameData')
->leftJoin('nameData.dataValues', 'dataValue')
->where('dataValue.id IS NULL')
->getQuery()
->getResult
Also, make sure to write bi-directional part of doctrine relationships, to be able to access children from parent entity NameData.php:
/**
* #var \Doctrine\Common\Collections\ArrayCollection
*
* #ORM\OneToMany(targetEntity="ValueData", mappedBy="nameData")
*/
private $valueDatas;
/**
* Constructor
*/
public function __construct()
{
$this->valueDatas = new \Doctrine\Common\Collections\ArrayCollection();
}
And in ValueData.php, edit $nameData property annotation to this:
/**
* #ORM\ManyToOne(targetEntity="NameData", inversedBy="valueDatas")
* #ORM\JoinColumn(name="name_id", referencedColumnName="id")
**/
private $nameData;