[iennae]

…n a multi-statement transaction with rollback

Problem:
The BigQuery documentation (https://cloud.google.com/bigquery/docs/transactions#example_of_a_transaction) needs a standalone, tested Python code sample demonstrating how to run a multi-statement transaction with rollback (region tag bigquery_multi_statement_transaction).

Solution:

• Add run_multi_statement_transaction(project_id: str, dataset_id: str, source_table_id: str, target_table_id: str) -> None in bigquery/transactions/bigquery_multi_statement_transaction.py (Execute a multi-statement GoogleSQL transaction across BigQuery tables using BEGIN TRANSACTION, COMMIT TRANSACTION, and EXCEPTION WHEN ERROR THEN ROLLBACK TRANSACTION.)
• Add unit tests (bigquery/transactions/bigquery_multi_statement_transaction_test.py) covering both the success path and API error handling (GoogleAPICallError)

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.

Compliance & Style

• I have followed the Sample Guidelines.

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Post-Approval Actions

• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• bigquery/transactions/bigquery_multi_statement_transaction.py:15, tag bigquery_multi_statement_transaction

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[gemini-code-assist]

Code Review

This pull request introduces a new BigQuery sample demonstrating how to execute a multi-statement SQL transaction with exception rollback handling using the Python client, along with corresponding unit tests and configuration files. The feedback suggests updating the ignored_versions in noxfile_config.py to ensure only the oldest and newest supported Python versions (3.10 and 3.13) are tested, ignoring intermediate versions like 3.11 and 3.12.

[XrossFox]

Code looks good to me, but a dependency on the requirements file is outdated.

[XrossFox]

This version of bigquery is over a year old, most recent version is 3.47.0