doudang2817 2017-01-26 14:36
浏览 136
已采纳

如何在BigQuery中使用非必填字段创建表?

I'm making a RESTful API in Go that writes rows in BigQuery. I'm using Google BigQuery package for Go.

In order to create the BigQuery scheme, I'm infering the schema from a struct as described in the example.

The problem is that, the resulting schema has all the non-repeated fields as "Required", so that, when I want to upload a struct with null values, the null values are uploaded as empy fields...

This is an example of my struct:

type Stats struct {
    Name            string        `bigquery:"name"`
    LastName        int           `bigquery:"last_name"`
    PhoneNumber     string        `bigquery:"phone_number"`
}

This is an example of how the schema is created:

testSchema, err := bigquery.InferSchema(Stats{})
if err != nil {
    // TODO: Handle error.
}

And, if I upload a struct with only one field set:

rows := []*Stats{
    {Name: "testA"},
}

u := table.Uploader()
err2 := u.Put(ctx, rows)

The result is that, in BigQuery, the fields "last_name" and "phone_number" is an empty string "" instead of NULL

  • 写回答

2条回答 默认 最新

  • duanlu1793 2018-04-05 16:43
    关注

    For that, apparently you would have to use the specific BigQuery nullable types (NullInt64, NullFloat64, NullString, NullBool, NullTimestamp, NullDate, NullTime and NullDateTime).

    Example using bigquery.NullBool: https://godoc.org/cloud.google.com/go/bigquery#ex-InferSchema--Tags

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 本题的答案是不是有问题
  • ¥15 关于#r语言#的问题:(svydesign)为什么在一个大的数据集中抽取了一个小数据集
  • ¥15 C++使用Gunplot
  • ¥15 这个电路是如何实现路灯控制器的,原理是什么,怎么求解灯亮起后熄灭的时间如图?
  • ¥15 matlab数字图像处理频率域滤波
  • ¥15 在abaqus做了二维正交切削模型,给刀具添加了超声振动条件后输出切削力为什么比普通切削增大这么多
  • ¥15 ELGamal和paillier计算效率谁快?
  • ¥15 蓝桥杯单片机第十三届第一场,整点继电器吸合,5s后断开出现了问题
  • ¥15 file converter 转换格式失败 报错 Error marking filters as finished,如何解决?
  • ¥15 Arcgis相交分析无法绘制一个或多个图形