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Update SQLAlchemy example(s) to use txn retries #4142

Merged
merged 1 commit into from
Jan 8, 2019
Merged

Update SQLAlchemy example(s) to use txn retries #4142

merged 1 commit into from
Jan 8, 2019

Commits on Jan 8, 2019

  1. Update SQLAlchemy example(s) to use txn retries 

    Addresses #3315.

Summary of changes:

- Update SQLAlchemy example code to use `run_transaction` function to
  perform txn retries automagically.

- Address the issue that the previous code sample could not be run more
  than once.

- Add note that Python 3 is used for the example code

- Add new 'Best Practices' section that describes what to do (and not
  do) when driving CockroachDB from SQLAlchemy, including:

  - Noting that one should not munge txn state inside `run_transaction`.

  - Showing some example code to address "transaction too large errors"
    by breaking updates into chunks.

  - Recommendation to use IMPORT for bulk work, not ORMs.

  - Recommendation to prefer query builder over ORM, if possible.

- Note: All of the changes listed above apply to v2.1 and v2.2
  docs.
    @rmloveland
    rmloveland committed Jan 8, 2019
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