if (false === strpos($tableName, '`')) {
            if (strpos($tableName, '.')) {
                $tableName = str_replace('.', '`.`', $tableName);
            }
            $tableName = '`' . $tableName . '`';
        }
        $sql = 'SHOW COLUMNS FROM ' . $tableName;
        // 调试开始
        $this->debug(true);
        $pdo = $this->linkID->query($sql);
        // 调试结束
        $this->debug(false, $sql);
        $result = $pdo->fetchAll(PDO::FETCH_ASSOC);
        $info   = [];
        if ($result) {
            foreach ($result as $key => $val) {
                $val                 = array_change_key_case($val);
                $info[$val['field']] = [
                    'name'    => $val['field'],