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GeezerVison is showing github.com — fix(sqlite): autocommit mode transaction handling to match CPython by ever0de · Pull Request #5918 · RustPython/RustPython

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ever0de commented Jul 9, 2025 •

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CPython Implementation

Summary by CodeRabbit

Bug Fixes
- Improved transaction management when switching to auto-commit mode by ensuring pending transactions are properly committed.
- Refined when transactions are started during statement execution, so transactions only begin if an isolation level is explicitly set.

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          fix(sqlite): autocommit mode transaction handling to match CPython

142b263

coderabbitai Bot commented Jul 9, 2025 •

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Walkthrough

The changes update transaction handling in the SQLite module. When the isolation level is set to None, any pending transaction is now committed if not already in auto-commit mode. Additionally, transactions are only started during DML execution if an explicit isolation level is set, refining transaction control logic.

Changes

File(s)	Change Summary
stdlib/src/sqlite.rs	Updated `Connection::set_isolation_level` to commit pending transactions when switching to auto-commit mode; modified `Cursor::execute` and `executemany` to only start transactions if an isolation level is set.

Poem

In the warren of code where the data flows free,
A bunny commits when set to "None" with glee.
Transactions now start only when told,
Isolation set—no stories untold.
With careful new rules, the queries all run,
Hopping through logic ‘til the work is done! 🐇

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Lib/test/test_sqlite3/test_transactions.py is excluded by !Lib/**

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stdlib/src/sqlite.rs (3 hunks)

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`**/*.rs`: Follow the default rustfmt code style (`cargo fmt` to format) Always ...

**/*.rs: Follow the default rustfmt code style (cargo fmt to format)
Always run clippy to lint code (cargo clippy) before completing tasks. Fix any warnings or lints that are introduced by your changes
Follow Rust best practices for error handling and memory management
Use the macro system (pyclass, pymodule, pyfunction, etc.) when implementing Python functionality in Rust

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stdlib/src/sqlite.rs

🔇 Additional comments (1)

stdlib/src/sqlite.rs (1)

1349-1358: Good implementation of autocommit mode transition!

The logic correctly commits any pending transaction when switching to autocommit mode (isolation_level = None), which aligns with CPython's behavior. Holding the lock throughout the check and commit operation properly prevents race conditions.

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gemini-code-assist Bot reviewed

Jul 9, 2025

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Summary of Changes

Hello @ever0de, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a fix to the SQLite module's transaction handling, specifically addressing behavior in autocommit mode to match CPython's implementation. The changes ensure that transactions are correctly committed when transitioning to autocommit and that implicit transactions are only initiated under specific conditions, leading to more predictable and consistent database interactions.

Highlights

SQLite Transaction Handling: When the isolation_level is explicitly set to None (indicating a transition to autocommit mode), any currently open transaction is now implicitly committed. This ensures that the database state is consistent when moving into a true autocommit state.
Implicit Transaction Logic Refinement: The conditions for implicitly beginning a transaction for DML (Data Manipulation Language) statements in autocommit mode have been refined. An implicit transaction will now only be started if an isolation_level is explicitly set (i.e., not None), even if the database is in autocommit mode. This aligns the behavior more closely with CPython's sqlite3 module, preventing unintended implicit transactions when true autocommit is desired.

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Code Review

The pull request addresses an issue with autocommit mode transaction handling in the SQLite module to align with CPython's behavior. It includes changes to commit pending transactions when setting the isolation level to None and adds a condition to begin transactions only when an isolation level is set.

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Comment thread

stdlib/src/sqlite.rs

Comment on lines +1485 to +1487

		if stmt.is_dml
		&& db.is_autocommit()
		&& zelf.connection.isolation_level.deref().is_some()

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The condition zelf.connection.isolation_level.deref().is_some() seems like it could be simplified. Consider extracting the deref() call to a local variable to improve readability and avoid dereferencing multiple times.

            let isolation_level = zelf.connection.isolation_level.deref();
            if stmt.is_dml
                && db.is_autocommit()
                && isolation_level.is_some()

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stdlib/src/sqlite.rs

Comment on lines +1568 to +1570

		if stmt.is_dml
		&& db.is_autocommit()
		&& zelf.connection.isolation_level.deref().is_some()

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            let isolation_level = zelf.connection.isolation_level.deref();
            if stmt.is_dml
                && db.is_autocommit()
                && isolation_level.is_some()

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ever0de marked this pull request as ready for review

July 9, 2025 07:46

youknowone commented Jul 9, 2025

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youknowone approved these changes

Jul 9, 2025

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youknowone merged commit e6fdef4 into RustPython:main

Jul 9, 2025

youknowone commented Jul 9, 2025

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coderabbitai Bot mentioned this pull request

Jul 15, 2025

Correctly implement isolation_level setter to handle deletion #5983

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coderabbitai Bot mentioned this pull request

Nov 21, 2025

Fix sqlite connection reinitialization #6288

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coderabbitai Bot mentioned this pull request

Jan 1, 2026

Upgrade dbm, implement sqlite3 autocommit #6616

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ever0de commented Jul 9, 2025 • edited by coderabbitai Bot Loading Uh oh! There was an error while loading. Please reload this page.

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References

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ever0de commented Jul 9, 2025 •

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