LessQL\Database::setPrimary PHP Method

    function setPrimary($table, $key)
    {
        $this->primary[$table] = $key;
        // compound keys are never auto-generated,
        // so we can assume they are required
        if (is_array($key)) {
            foreach ($key as $k) {
                $this->setRequired($table, $k);
            }
        }
        return $this;
    }