class TableInfo {

    public String getFieldNames() {
        //TODO 感觉这个也啥必要,不打算公开set方法了
        if (StringUtils.isBlank(fieldNames)) {
            this.fieldNames = this.fields.stream().map(TableField::getColumnName).collect(Collectors.joining(", "));
        }
        return this.fieldNames;
    }

}