google-big-queryHow can I use Google BigQuery to wait for a query to complete?
Using Google BigQuery to wait for a query to complete is a simple process.
First, create a job configuration object and set the configuration query property to the query you want to execute:
job_config = bigquery.QueryJobConfig()
job_config.query = query_string
Next, create a query job and submit it to BigQuery:
query_job = bigquery.Client().query(job_config)
Finally, wait for the query job to complete and retrieve the results:
query_job.result()
The query_job.result()
method will block until the query job is finished and will return a list of results. You can also use the query_job.done()
method to check if the query job is finished.
The following code snippet shows an example of how to wait for a query job to complete and retrieve the results:
from google.cloud import bigquery
# Create a job configuration object and set the configuration query property to the query you want to execute
job_config = bigquery.QueryJobConfig()
job_config.query = query_string
# Create a query job and submit it to BigQuery
query_job = bigquery.Client().query(job_config)
# Wait for the query job to complete and retrieve the results
results = query_job.result()
# Print the results
for row in results:
print(row)
The output will be the results of the query you specified.
Code explanation
job_config = bigquery.QueryJobConfig()
- Create a job configuration object to specify the query to execute.job_config.query = query_string
- Set the configuration query property to the query you want to execute.query_job = bigquery.Client().query(job_config)
- Create a query job and submit it to BigQuery.query_job.result()
- Wait for the query job to complete and retrieve the results.for row in results:
- Loop through the results and print each row.
Helpful links
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