我通过google-cloud-python
查询BigQuery,如下所示:
client = bigquery.Client()
query = """SELECT * FROM `{dataset}.{table}`
WHERE id=@id LIMIT 1""".format(dataset=dataset,
table=table)
param = ScalarQueryParameter('id', 'STRING', id)
query = client.run_sync_query(query, query_parameters=[param])
query.use_legacy_sql = False
query.timeout_ms = 1000
query.run()
assert query.complete
try:
results = query.rows[0]
except IndexError:
results = None
这将返回如下数据:
[
"Tue, 11 Apr 2017 03:18:52 GMT",
"A132",
"United Kingdom",
[
{
"endDate": "2012-12-05",
"startDate": "2011-12-27",
"statusCode": "Terminated"
}
]
]
重复字段已转换为 JSON。但是我希望其余数据也转换为JSON。我可以通过检查query.schema
自己实现这一点,但似乎这应该在库中,因为它已经发生在重复元素中。
如何使用此库将 BigQuery 查询结果格式化为 JSON? 例如:
{
"timestamp": "Tue, 11 Apr 2017 03:18:52 GMT",
"id": "A132",
"country": "United Kingdom",
[
{
"endDate": "2012-12-05",
"startDate": "2011-12-27",
"statusCode": "Terminated"
}
]
}
事实证明,代码非常简单:
field_names = [f.name for f in query.schema]
try:
raw_results = query.rows[0]
zipped_results = zip(field_names, raw_results)
results = {x[0]: x[1] for x in zipped_results}
except IndexError:
results = None