php – Doctrine QueryBuilder和concat问题

class PlayerRepository extends EntityRepository
{
    public function findByPartialNameMatch($trainer,$fullName)
    {
        $qb = $this->createQueryBuilder('tp');

        $qb->innerJoin('tp.player','p')
            ->where($qb->expr()->andX(
                    $qb->expr()->orX(
                        $qb->expr()->like(
                            $qb->expr()->concat('p.firstName',$qb->expr()->concat(' ','p.lastName')),$qb->expr()->literal($fullName.'%')
                        ),$qb->expr()->like(
                            $qb->expr()->concat('p.lastName','p.firstName')),$qb->expr()->literal($fullName.'%')
                        )
                    ),$qb->expr()->eq('tp.trainer','?1')
                 )
             )
        ->groupBy('p.id')
        ->orderBy('p.lastName','ASC')
        ->orderBy('p.firstName','ASC')
        ->setParameter(1,$trainer);

    return $qb->getQuery()->getResult();
}

}

当我运行它时,Symfony2抛出以下错误消息：

[Syntax Error] line 0,col 123: Error: Expected StateFieldPathExpression | string |      InputParameter | FunctionsReturningStrings | AggregateExpression,got ','

查看堆栈跟踪,显示以下内容：

at QueryException ::syntaxError ('line 0,col 123: Error: Expected   StateFieldPathExpression | string | InputParameter | FunctionsReturningStrings |  AggregateExpression,'')
in D:WorkvendordoctrinelibDoctrineORMQueryParser.php at line 396  -+
at Parser ->syntaxError ('StateFieldPathExpression | string | InputParameter |  FunctionsReturningStrings | AggregateExpression')
in D:WorkvendordoctrinelibDoctrineORMQueryParser.php at line 2391  -+
at Parser ->StringPrimary ()
in D:WorkvendordoctrinelibDoctrineORMQueryASTFunctionsConcatFunction.php at line 60  -+
at ConcatFunction ->parse (object(Parser))
in D:WorkvendordoctrinelibDoctrineORMQueryParser.php at line 2852  -

从上面可以看出,这个问题与concat helper函数有某种关系,并且该函数需要枚举输入,但不知何故(？)收到了一个逗号(,).

上面的代码有什么问题？搜索时间无法解决问题.

谢谢你的帮助！