Symfony4 Doctrineでconvert関数を使う

DQLユーザー定義クラスを適当なServive内とかに作る

<?php
namespace App\Service\Doctrine;

use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\Parser;
use Doctrine\ORM\Query\SqlWalker;

class Convert extends FunctionNode
{
    protected $dateExpression;

    protected $fromTz;

    protected $toTz;

    /**
     * {@inheritdoc}
     */
    public function getSql(SqlWalker $sqlWalker)
    {
        return sprintf("CONVERT(%s USING %s)",
            $sqlWalker->walkArithmeticPrimary($this->field),
            //$sqlWalker->walkSimpleArithmeticExpression($this->using), // or remove USING and uncomment this
            $sqlWalker->walkSimpleArithmeticExpression($this->charset)

            );
    }

    /**
     * {@inheritdoc}
     */
    public function parse(Parser $parser)
    {
        $parser->match(Lexer::T_IDENTIFIER);
        $parser->match(Lexer::T_OPEN_PARENTHESIS);
        $this->field   = $parser->ArithmeticPrimary();
        // adopt use bypass validate variable of parse by using AliasResultVariable ...!!
        $this->using   = $parser->AliasResultVariable();
        $this->charset = $parser->AliasResultVariable();
        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
    }
}

参考：https://github.com/beberlei/DoctrineExtensions/tree/master/src/Query/Mysql

定義した関数を登録

config\packages\doctrine.yaml

doctrine:
        dql:
            string_functions:
                convert: App\Service\Doctrine\Convert

使用する

$qb->andwhere('convert(i.etcField USING utf8) like :etcField')->setParameter('etcField','%TEST%' );