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python-2.7 - 大查询视图中的字段说明

问题描述

我知道这个问题之前已经提出并且似乎已经解决了.. https://issuetracker.google.com/issues/35905194

但这可以使用 Python 完成吗？

我有一个脚本，当我想更新 Big Query 表上的字段描述但当我在视图上运行完全相同的脚本时没有任何反应？

脚本运行，我没有收到任何错误，但它只是没有更新 Big Query 中的视图

我正在使用 Python 2.7.13

这是我的代码..

from google.cloud import bigquery
from datetime import datetime
import json
import sys

project='xxxx'
ds='xxxxx'
table_n='xxxxx'

startTime=datetime.now()
#Authorisation 
filename='xxxxxx.json'
client =  bigquery.Client.from_service_account_json(filename)

dataset_id = ds
table_id = table_n

table_schema= []
table_schema.append(bigquery.SchemaField('BWMI_ID', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('VP_VIN_PREFIX', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('CHASSIS_NUMBER', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('CAESAR_KEY', 'INTEGER', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('ID', 'INTEGER', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('VEH_ID', 'INTEGER', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('LOEV_ID', 'INTEGER', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('D42_LAST_UPDATED', 'TIMESTAMP', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('D42_END_DATE', 'TIMESTAMP', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('USER_1_ID', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('DESCRIPTION', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('DATE_ADDED', 'TIMESTAMP', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('DATE_ENDED', 'TIMESTAMP', mode='NULLABLE'))                            
table_schema.append(bigquery.SchemaField('SOURCE', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('CANCELLED', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('CANCELLED_DATE', 'TIMESTAMP', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('CRC32', 'STRING', mode='NULLABLE'))
table_schema.append(bigquery.SchemaField('CREATED_DATE', 'TIMESTAMP', mode='NULLABLE')) 

original_schema=table_schema
table_ref = client.dataset(dataset_id).table(table_id)
table = bigquery.Table(table_ref, schema=original_schema)

new_schema= []
new_schema.append(bigquery.SchemaField('BWMI_ID', 'STRING', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('VP_VIN_PREFIX', 'STRING', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('CHASSIS_NUMBER', 'STRING', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('CAESAR_KEY', 'INTEGER', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('ID', 'INTEGER', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('VEH_ID', 'INTEGER', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('LOEV_ID', 'INTEGER', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('D42_LAST_UPDATED', 'TIMESTAMP', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('D42_END_DATE', 'TIMESTAMP', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('USER_1_ID', 'STRING', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('DESCRIPTION', 'STRING', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('DATE_ADDED', 'TIMESTAMP', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('DATE_ENDED', 'TIMESTAMP', mode='NULLABLE', description = 'Updated by python script'))                            
new_schema.append(bigquery.SchemaField('SOURCE', 'STRING', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('CANCELLED', 'STRING', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('CANCELLED_DATE', 'TIMESTAMP', mode='NULLABLE', description = 'Updated by python script'))
new_schema.append(bigquery.SchemaField('CRC32', 'STRING', mode='NULLABLE'))
new_schema.append(bigquery.SchemaField('CREATED_DATE', 'TIMESTAMP', mode='NULLABLE'))

table.schema = new_schema
table = client.update_table(table, ['schema'])

标签： python-2.7google-bigquery

解决方案

我试图复制您的场景，但是，Python 客户端库对我来说运行良好

 #NEW VIEW
 view_ref = client.dataset(dataset_id).table(view_name)
 client.delete_table(view_ref)
 view = bigquery.Table(view_ref)
 sql_template = ('SELECT DISTINCT user,team FROM `{}.{}.{}` WHERE score = 19')
 view.view_query = sql_template.format(project,dataset_id,original_table)
 view = client.create_table(view)
 print('Successfully created view at {}'.format(view.full_table_id))
 #UPDATE VIEW
 view_schema= [
     bigquery.SchemaField('user', 'STRING', mode='NULLABLE',description='user name VIEW updated'),
     bigquery.SchemaField('team', 'STRING', mode='NULLABLE',description='team name VIEW updated'),
 ]
 viewU = bigquery.Table(view_ref,schema=view_schema)
 viewU = client.update_table(viewU,['schema'])
 print('UPDATED VIEW SCHEMA: {}').format(viewU.schema) #VERIFY THE SCHEMA

以及bq 命令： bq show --format=prettyjson [PROJECT_ID]:[DATASET].[VIEW]

您是否尝试过单击RefreshBQ UI 中“查看详细信息”屏幕中的按钮？

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