Symfony2 Doctrine - ILIKE clause for PostgreSQL?

I don't know about Symphony, but you can substitute

a ILIKE b

with

lower(a) LIKE lower(b)

You could also try the operator ~~*, which is a synonym for ILIKE It has slightly lower operator precedence, so you might need parenthesis for concatenated strings where you wouldn't with ILIKE

a ILIKE b || c

becomes

a ~~* (b || c)

The manual about pattern matching, starting with LIKE / ILIKE.

I think this guy had the same problem and got an answer:
http://forum.symfony-project.org/viewtopic.php?f=23&t=40424

Obviously, you can extend Symfony2 with SQL vendor specific functions:
http://docs.doctrine-project.org/projects/doctrine-orm/en/2.1/cookbook/dql-user-defined-functions.html

I am not a fan of ORMs and frameworks butchering the rich functionality of Postgres just to stay "portable" (which hardly ever works).

This works for me (Symfony2 + Doctrine 2)

$qq = 'SELECT x FROM MyBundle:X x WHERE LOWER(x.y) LIKE :y';
$q = $em->createQuery($qq)->setParameter(':y', strtolower('%' . $filter . '%'));
$result = $q->getResult();

Unfortunately, we still do not have the ability to create custom comparison operators...

But we can create a custom function in which we implement the comparison.

Our DQL query well look like this:

SELECT q FROM App\Entity\Customer q WHERE ILIKE(q.name, :name) = true

The class describing the ILIKE function will look like this:

class ILike extends FunctionNode
{
    /** @var Node */
    protected $field;
    /** @var Node */
    protected $query;

    /**
     * @param Parser $parser
     *
     * @throws \Doctrine\ORM\Query\QueryException
     */
    public function parse(Parser $parser)
    {
        $parser->match(Lexer::T_IDENTIFIER);
        $parser->match(Lexer::T_OPEN_PARENTHESIS);
        $this->field = $parser->StringExpression();
        $parser->match(Lexer::T_COMMA);
        $this->query = $parser->StringExpression();
        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
    }

    /**
     * @param SqlWalker $sqlWalker
     *
     * @return string
     * @throws \Doctrine\ORM\Query\AST\ASTException
     */
    public function getSql(SqlWalker $sqlWalker)
    {
        return '(' . $this->field->dispatch($sqlWalker) . ' ILIKE ' . $this->query->dispatch($sqlWalker) . ')';
    }
}

The resulting SQL will look like this:

SELECT c0_.id AS id_0,
       c0_.name AS name_1,
FROM customer c0_
WHERE (c0_.name ILIKE 'paramvalue') = true