Error when use custom DQL function with Doctrine and Symfony2 - php

Question

I use Symfony 2 and the ORM Doctrine. I want to create and register a custom DQL function. In fact, I want to use the SQL function "CAST" in my request, like this :
$qb = $this->_em->createQueryBuilder();
$qb->select('d')
->from('\Test\MyBundle\Entity\MyEntity', 'd')
->orderBy('CAST(d.myField AS UNSIGNED)', 'ASC')
return $qb->getQuery()->getResult();
For this, I have created a "CastFunction" who extend "FunctionNode" :
namespace Test\MyBundle\DQL;
use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\SqlWalker;
use Doctrine\ORM\Query\Parser;
class CastFunction extends FunctionNode
{
public $firstDateExpression = null;
public $secondDateExpression = null;
public function parse(\Doctrine\ORM\Query\Parser $parser)
{
$parser->match(Lexer::T_IDENTIFIER);
$parser->match(Lexer::T_OPEN_PARENTHESIS);
$this->firstDateExpression = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_IDENTIFIER);
$this->secondDateExpression = $parser->ArithmeticPrimary();
$parser->match(Lexer::T_CLOSE_PARENTHESIS);
}
public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
{
return sprintf('CAST(%s AS %s)', $this->firstDateExpression->dispatch($sqlWalker), $this->secondDateExpression->dispatch($sqlWalker));
}
}
Of course, I have registered this class in my config.yml :
doctrine:
orm:
dql:
string_functions:
CAST: Test\MyBundle\DQL\CastFunction
Now, when I try my request, I obtain the following error:
"[Semantical Error] line 0, col 83 near 'UNSIGNED)': Error: 'UNSIGNED' is not defined."
I search but I don't where is the problem!
Have you got a idea?

Answer 1

After several search, I have finally found the solution. I had two problems: first my parse function was wrong, second, I called a SQL function in my orderBy (thank you Cerad).
So, here is my correct class:
namespace Ypok\YPoliceBundle\DQL;
use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\SqlWalker;
use Doctrine\ORM\Query\Parser;
class CastFunction extends FunctionNode
{
public $firstDateExpression = null;
public $unit = null;
public function parse(\Doctrine\ORM\Query\Parser $parser)
{
$parser->match(Lexer::T_IDENTIFIER);
$parser->match(Lexer::T_OPEN_PARENTHESIS);
$this->firstDateExpression = $parser->StringPrimary();
$parser->match(Lexer::T_AS);
$parser->match(Lexer::T_IDENTIFIER);
$lexer = $parser->getLexer();
$this->unit = $lexer->token['value'];
$parser->match(Lexer::T_CLOSE_PARENTHESIS);
}
public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
{
return sprintf('CAST(%s AS %s)', $this->firstDateExpression->dispatch($sqlWalker), $this->unit);
}
}
And now, I can use perfectly the SQL function 'CAST' in my repository:
$qb = $this->_em->createQueryBuilder();
$qb->select('d, CAST(d.myField AS UNSIGNED) AS sortx')
->from('\Test\MyBundle\Entity\MyEntity', 'd')
->orderBy('sortx', 'ASC')
return $qb->getQuery()->getResult();
Best regards

Answer 2

Can't find the reference but functions are not allowed in the order by clause. You need to cast your value in the select statement then sort by it.
Something like:
$qb->select('d, CAST(d.myField AS UNSIGNED) AS sortx)
->from('\Test\MyBundle\Entity\MyEntity', 'd')
->orderBy('sortx, 'ASC')
That is assuming your CAST function is written correctly.