MysqliDb::_buildDataPairs PHP Method

    public function _buildDataPairs($tableData, $tableColumns, $isInsert)
    {
        foreach ($tableColumns as $column) {
            $value = $tableData[$column];
            if (!$isInsert) {
                if (strpos($column, '.') === false) {
                    $this->_query .= "`" . $column . "` = ";
                } else {
                    $this->_query .= str_replace('.', '.`', $column) . "` = ";
                }
            }
            // Subquery value
            if ($value instanceof MysqliDb) {
                $this->_query .= $this->_buildPair("", $value) . ", ";
                continue;
            }
            // Simple value
            if (!is_array($value)) {
                $this->_bindParam($value);
                $this->_query .= '?, ';
                continue;
            }
            // Function value
            $key = key($value);
            $val = $value[$key];
            switch ($key) {
                case '[I]':
                    $this->_query .= $column . $val . ", ";
                    break;
                case '[F]':
                    $this->_query .= $val[0] . ", ";
                    if (!empty($val[1])) {
                        $this->_bindParams($val[1]);
                    }
                    break;
                case '[N]':
                    if ($val == null) {
                        $this->_query .= "!" . $column . ", ";
                    } else {
                        $this->_query .= "!" . $val . ", ";
                    }
                    break;
                default:
                    throw new Exception("Wrong operation");
            }
        }
        $this->_query = rtrim($this->_query, ', ');
    }