Big Query 视图中的字段说明 [英] Descriptions on Fields in Big Query Views

问题描述

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

I know this question has been raised before and appeared to have been resolved.. https://issuetracker.google.com/issues/35905194

但是这可以使用 Python 完成吗?

But can this be done using Python yet ?

当我想更新 Big Query 表上的字段描述时，我有一个脚本可以工作，但是当我在视图上运行完全相同的脚本时，没有任何反应?

I have a script which works when I want to update field descriptions on a Big Query table but when I run the exact same script on a view nothing happens ?

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

The script runs and I don't get any error but it is just not updating the view in Big Query

我使用的是 Python 2.7.13

I am using 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'])

推荐答案

我已尝试复制您的方案，但是，Python 客户端库对我来说运行良好

I've tried to replicate your scenario, however, the Python client libraries are working well for me

 #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 BQ UI 中查看详细信息"屏幕中的 Refresh 按钮?

Have you tried clicking the Refresh button within the "View Details" screen in the BQ UI?

这篇关于Big Query 视图中的字段说明的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！