class.arConcatCollection.php

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<?php

class arConcatCollection extends arStatementCollection
{
    public function asSQLStatement(ilDBInterface $db): string
    {
        $return = '';
        if ($this->hasStatements()) {
            $return = ', ';
            $concats = $this->getConcats();
            foreach ($concats as $concat) {
                $return .= $concat->asSQLStatement($this->getAr(), $db);
                if ($concat !== end($concats)) {
                    $return .= ', ';
                }
            }
        }

        return $return;
    }

    public function getConcats(): array
    {
        return $this->statements;
    }
}