4.0 changelog

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Martin edited this page Apr 27, 2020 · 38 revisions

Driver Migration Guide

Please read our Driver Migration Guide for guidance and breaking changes when migrating from 1.7 drivers to 4.0 drivers.

Changelog

4.0.0b1 (Not released)

The fetch_size config setting for session is now in use for Bolt Protocol 4.0 and fetches records in batches as needed when invoking session.run().
Result.summary() have been replaced with Result.consume(), this behaviour is to consume all remaining records in the buffer and returns the ResultSummary.

4.0.0a4

Configuration max_retry_time is renamed to max_transaction_retry_time
Updated examples

4.0.0a3

Multi database support (#384)

4.0.0a2

Fix for non-blocking sendall (#378)

4.0.0a1

neobolt is not a dependency any more.
Support for Bolt Protocol 3.0
Support for Bolt Protocol 4.0 (Connection Layer Only)
Added a Bookmark class
Bookmarks are changed from a String to Bookmark object.
Added driver.verify_connectivity() method.
Exceptions Changes:
- Removed ConnectionExpired
- Renamed neo4j.exceptions.CypherError to neo4j.exceptions.Neo4jError
- Introduced Driver API class hierarchy with Neo4jError and DriverError
- (Internal API) Introduced Connection API class hierarchy with BoltError (Please raise an issue on github if these surface to the user.)
- Improved connection failure error message information.
- Connecting to unsupported Bolt Protocol will raise an error explaining the supported versions available for the driver.
Removed transaction.success flag.

The pattern is no longer valid for a transaction object, tx:
```
tx = begin()
# DO STUFF
tx.success = True
tx.close()
```
Use the pattern instead:
```
tx = begin()
# DO STUFF
tx.commit()
```
Connections are now unencrypted by default; to reproduce former behaviour, add encrypted=True to Driver configuration.
The neo4j.v1 subpackage is now no longer available; all imports should be taken from the neo4j package instead.
Changed session(access_mode) from a positional to a keyword argument
The bolt+routing URI scheme is now named neo4j
Added new URI scheme bolt+ssc, this will set the direct driver to be secure and allow self signed sertificates.
Added new URI scheme bolt+s, this will set the direct driver to be secure.
Added new URI scheme neo4j+ssc, this will set the routing driver to be secure and allow self signed sertificates.
Added new URI scheme neo4j+s, this will set the routing driver to be secure.
Python 3.8 supported.
Python 3.7 supported.
Python 3.6 supported.
Python 3.5 supported.
Python 3.4 support has been dropped.
Python 3.3 support has been dropped.
Python 3.2 support has been dropped.
Python 3.1 support has been dropped.
Python 3.0 support has been dropped.
Python 2.7 support has been dropped.