Error when use custom DQL function with Doctrine and Symfony2

问题:

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?

回答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

回答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.

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