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PODoctrine2 - Specific NULL sorting
 

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    <p>When you sort on column <code>a</code> descending, it will put all records having <code>a</code> <code>NULL</code> at the bottom, which makes sense. What I want is the following ordering when I'm sorting on attribute <code>a</code> descending:</p> <pre><code>a ---- NULL NULL 5 4 3 2 1 </code></pre> <p>I know Oracle has <code>NULLS_FIRST</code> and in MySQL you could use <code>ORDER BY ISNULL(a)</code>, but I'm wondering whether there is an elegant way to deal with this using Doctrine2 functionality only? So not using native queries, etc.</p> <hr> <p>Answer with the help of S0pa: I fixed it using the following new function node for Doctrine2:</p> <pre><code>&lt;?php namespace MyBundle\General; use \Doctrine\ORM\Query\Lexer; class IsnullFunctionNode extends \Doctrine\ORM\Query\AST\Functions\FunctionNode { private $isnull; public function parse(\Doctrine\ORM\Query\Parser $parser) { $parser-&gt;match(Lexer::T_IDENTIFIER); $parser-&gt;match(Lexer::T_OPEN_PARENTHESIS); $this-&gt;isnull = $parser-&gt;ArithmeticPrimary(); $parser-&gt;match(Lexer::T_CLOSE_PARENTHESIS); } public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker) { return 'ISNULL('.$this-&gt;isnull-&gt;dispatch($sqlWalker).')'; } } </code></pre> <p>And connected it in Symfony2 to Doctrine2 like this (app.yml):</p> <pre><code>doctrine: orm: entity_managers: default: ... dql: numeric_functions: isnull: Diagenda\CommonBundle\General\IsnullFunctionNode </code></pre> <p>I can't use these functions in my <code>ORDER BY</code> clause, but by doing a <code>SELECT ISNULL(a) AS n_a</code> I can order on the <code>n_a</code> attribute.</p>
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