无法使用 python 将 JSON 文件从谷歌云存储加载到 bigquery答案

【问题标题】：Unable to load a JSON file from google cloud storage to bigquery using python无法使用 python 将 JSON 文件从谷歌云存储加载到 bigquery
【发布时间】：2017-07-05 06:43:09
【问题描述】：

我正在尝试将文件从我的 Google 云存储导出到 Google bigquery，但遇到了许多问题。

#standardSQL
import json
import argparse
import time
import uuid

from google.cloud import bigquery
from google.cloud import storage

dataset = 'dataworks-356fa'
source = 'gs://dataworks-356fa-backups/pullnupload.json'

def load_data_from_gcs(dataset, test10, source ):
    bigquery_client = bigquery.Client(dataset)
    dataset = bigquery_client.dataset('FirebaseArchive')
    table = dataset.table(test10)
    job_name = str(uuid.uuid4())

    job= bigquery_client.load_table_from_storage(
        job_name, table, "gs://dataworks-356fa-backups/pullnupload.json")
    job.source_format = 'NEWLINE_DELIMITED_JSON'
    job.begin()

    # wait_for_job(job)
    print("state of job is: " + job.state)
#     print("errors: " + job.errors)

load_data_from_gcs(dataset, 'test10', source)

当wait_for_job(job) 行没有被注释掉时，我会收到这个错误

Traceback (most recent call last): 
File "cloudtobq.py", line 42, in <module> 
load_data_from_gcs(dataset, 'test10', source) 
File "cloudtobq.py", line 38, in load_data_from_gcs 
wait_for_job(job) 
NameError: global name 'wait_for_job' is not defined

当print("errors: " + job.errors) 未被注释掉时，我会收到此错误。

Traceback (most recent call last): 
File "cloudtobq.py", line 42, in <module> 
load_data_from_gcs(dataset, 'test10', source) 
File "cloudtobq.py", line 40, in load_data_from_gcs 
print("errors: " + job.errors) 
TypeError: cannot concatenate 'str' and 'NoneType' objects

当两者都被注释掉时，这就是我收到的内容，然后返回到原始终端屏幕。

Wess-MacBook-Pro:desktop wesstephens$ python cloudtobq.py
state of job is: RUNNING
Wess-MacBook-Pro:desktop wesstephens$

【问题讨论】：

标签： python python-2.7 upload google-bigquery google-cloud-storage

【解决方案1】：

你需要包含函数from the documentation sample code的定义：

def wait_for_job(job):
    while True:
        job.reload()
        if job.state == 'DONE':
            if job.error_result:
                raise RuntimeError(job.errors)
            return
        time.sleep(1)

您不需要打印job.errors，因为如果作业不成功，wait_for_job 会引发异常。

【讨论】：