class.arSelectCollection.php

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<?php

class arSelectCollection extends arStatementCollection
{
    public function asSQLStatement(ilDBInterface $db): string
    {
        $return = 'SELECT ';
        if ($this->hasStatements()) {
            $activeRecord = $this->getAr();
            $selectSQLs = array_map(fn($select) => $select->asSQLStatement($activeRecord, $db), $this->getSelects());
            $return .= implode(', ', $selectSQLs);
        }

        return $return;
    }

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