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Richard Irons edited this page May 2, 2024 · 37 revisions

5.20.0

⭐ New Features

  • Object mapping moved out of preview (#784)
  • Default object mapper made stricter in order to avoid unpredictable or unexpected results (#792, #796)

5.18.1

🐛 Bug Fix:

  • Reclassification of transient error when opening SSL Connection (#788)

5.18.0

⭐ New Features

  • Add session auth to executableQuery config (#774)
  • Invariant capable records (#780)
  • Change DictAsRecord to have non-surprising case sensitivity (#782)

🐛 Bug Fix

  • Fix race condition for parallel queries in a transaction (#785)

5.17.0

⭐ New Features

  • support .NET 8 (#770)

🐛 Bug fix

  • fix cancellation token being ignored for ExecuteQuery (#771)

5.16.0

⭐ New features

  • Introduce TransactionConfig parameter to query config (#754)
  • Liveness check (#756)

🚀 Optimizations

  • Protect default memory pool for bolt (#758)
  • Update array pool config, allow driver to request a max sized array (#764)
  • Reduce memory allocations when creating a record object (#767)

Other

  • Refactoring of internal code to remove warnings and tidy the code base

5.15.0

🔮 Preview features

  • Constructor mapping added to object mapping feature (#751)

Other

  • The legal header at the top of each source file has been updated (#752)

5.14.0

⭐ New features

  • Reauth moved from preview to general availability. (#744)
  • Introduction of Security and Topology notification categories. (#738)
  • Introduction of Bolt 5.4 (Introduced to Neo4j in server version 5.13) and TELEMETRY message. (#735
    • The driver can opt out of telemetry collection using ConfigBuilder.WithTelemetryDisabled().
    • Telemetry is only collected when connecting to aura and is limited to which APIs were used to create a transaction.

⚠️ Bug fixes

  • All cursors belonging to a transaction are now invalidated if an error invalidates any of the transaction's queries. (#737)
    • If the initial exception was ignored, this could result in undefined behavior, but now will result in a TransactionTerminatedException; Any further interaction with any constituent results from the transaction will throw this error.

5.13.0

🔮 Preview Feature: Record to Object Mapping

This new feature allows records to be mapped to objects simply and without endless boilerplate. Please see this discussion for full details and instructions.

🔮 New convenience methods in preview

The following extension methods have been added in order to make code that deals with the IRecord and IEntity (implemented by both INode and IRelationship) interfaces more readable - for example, when writing custom mapping code. The Neo4j.Driver.Preview.Mapping namespace must be referenced to use these methods.

IRecord.AsObject<T>()

Invokes the mapping functionality and returns an instance of T mapped from the record. T must have a parameterless constructor.

IRecord.GetValue<T>(string key)

Gets the value of the given key from the record, converting it to the given type. For example, the code record["name"].As<string>() becomes record.GetValue<string>("name").

IRecord.GetXXXX(string key)

This is a group of extension methods for the most commonly used primitive types: GetString, GetInt, GetLong, GetDouble, GetFloat and GetBool. These just call GetValue<T> for the type named in the method name, so record["name"].As<string>() becomes record.GetString("name").

IEntity.GetValue<T>(string key)

Gets the value of the given key from the entity, converting it to the given type. For example, the code entity["name"].As<string>() becomes entity.GetValue<string>("name").

IEntity.GetXXXX(string key)

The same group of methods as IRecord.GetXXXX, but for an entity.

IRecord.GetEntity(string key)

Gets the IEntity identified by the given key from the record. When combined with the other methods, this can lead to more readable code that gets values from entities within records, so for example this code:

var name = record["person"].As<IEntity>().Properties["name"].As<string>();

becomes:

var name = record.GetEntity("person").GetString("name");

5.12.0

🚀 Optimization

  • ExecutableQuery performance enhancement: Remove a server round-trip for IDriver.ExecutableQuery API Docs.

🔬 Experimental/Preview changes

  • Changes to the re-auth functionality allow for catering to a wider range of use cases including simple password rotation.
  • All re-auth-related namespaces have been moved to preview - previously some did not have this, although the classes therein would not have been usable.
  • The OnTokenExpiredAsync method in the IAuthTokenManager interface was removed, and a new HandleSecurityExceptionAsync method was added in its place.
  • The ExpirationBased method in AuthTokenManagers was renamed to Bearer, and a new Basic method was added to cater for password rotation.

5.11.0

Fixes & Deprecation ⚠️

  • Fixes for ZonedDateTime.
    • Introduce Ambiguous bool property, Creating ZonedDateTime with out a datetime kind, or using a datetime kind local with a named Zone:Zone.of(string), meant we could create an ambiguous date time.
    • Introduce ZonedDateTime.AmbiguityReason enum flags type.
    • Introduce Reason AmbiguityReason property for ZonedDateTimes, to allow users to see why a value is considered ambiguous.
    • Introduce UtcSeconds long property which is the understood monotonic timestamp from unix epoch in UTC.
    • Fix ZonedDateTime lazily parsing when returned from a query, now it is parsed immediately.
    • Fix ZonedDateTime not supporting values outside of range of BCL Date Types
    • Add Ticks Property, and constructor which can be used for easy interop with nodatime's Instant
    • Deprecated 2 constructors that do not include DateTimeKind(API Doc, deprecated constructor, API Doc, deprecated constructor)
  • TransactionConfigBuilder's WithTimeout has been updated to respect neo4j transaction timeouts using whole milliseconds.
    • The WithTimeout method checks that the number of ticks represented by the timeout represents an exact number of milliseconds.
    • If not, then it round the timeout up to the next whole millisecond, for example, 0.1ms is rounded to 1ms, and 1.8ms is rounded to 2ms.
    • If using TimeSpan.MaxValue then no rounding will be performed since rounding up to a whole number of milliseconds would result in a value greater than TimeSpan.MaxValue.

5.10.0

No changes.

5.9.0

⭐ New Features

  • Support for bolt protocol 5.3 which adds bolt_agent metadata so that the server knows which driver is connecting (#706).
  • Re-authentication (in preview) (#689)
    Allows for handling expiring authentication (backwards compatible) as well as session scoped authentication (requires neo4j server version 5.6+).
    We are actively looking for feedback: https://github.com/neo4j/neo4j-dotnet-driver/discussions/705

📚 Docs

Mention performance impact of notification filtering (#703).

5.8.0

⭐ New Features

  • The ExecuteQuery API has now been moved out of preview. This provides a much simpler way to execute queries directly at the driver level, with sessions, transactions and bookmarks handled automatically.
Examples
var queryOp = await driver
    .ExecutableQuery("MATCH (person:Person) RETURN person")
    .ExecuteAsync();

Query Execution Result

The result of executing a query in the way shown above is an EagerResult<T>, where T is the type of data returned from the query. In the simplest case, this will be an IReadOnlyList<IRecord>, which is a fully materialized list of the records returned by the query. Other types of results can be used by using the fluent API exposed by the IExecutableQuery type, for example:

var queryOp = await driver
    .ExecutableQuery("MATCH (person:Person) RETURN person")
    .WithMap(r => r["person"].As<INode>()["name"].As<string>())
    .WithFilter(s => s.StartsWith("A"))
    .ExecuteAsync();

With this method, the return type will be EagerResult<IReadonlyList<string>>. Multiple .WithMap and .WithFilter calls may be chained together. Note that filtering is performed locally here so it should not be used in place of doing filtering on the server.

There is also a .WithReduce method, to be used as follows:

var queryOp = await driver
    .ExecutableQuery("MATCH (person:Person) RETURN person")
    .WithMap(r => r["person"].As<INode>()["age"].As<int>())
    .WithReduce(() => 0, (r, n) => r + n)
    .ExecuteAsync();

This will result in an EagerResult<int>, with the Result property containing the sum of all the ages.

Custom processing of the record stream can be done by using the .WithStreamProcessor method:

var queryOp = await driver
    .ExecutableQuery("MATCH (person:Person) RETURN person")
    .WithStreamProcessor(
        async stream =>
        {
            double total = 0;
            int count = 0;

            await foreach(var record in stream)
            {
                var age = record["person"].As<INode>()["age"].As<double>();
                total += age;
                count++;
            }

            return total / count;
        })
    .ExecuteAsync();

Here we simply supply a delegate, which will be called, passing a parameter of type IAsyncEnumerable<IRecord>. The value returned from this delegate will be an EagerResult<double>, with the Result property containing the average age.

Parameters can also be specified using the fluent interface, as follows.

var paramQuery = await driver
    .ExecutableQuery("MATCH (p:Person) WHERE p.name = $name RETURN p")
    .WithParameters(new { name = "Tom Hanks" })
    .WithMap(r => r["p"].As<INode>()["name"].As<string>())
    .ExecuteAsync();

5.7.0

🔬 Experimental/Preview changes

  • the Neo4j.Driver.Experimental namespace has been renamed to Neo4j.Driver.Preview. This will be a compile-time breaking change for any code using this namespace. No functionality has been changed.

⭐ New Features

  • Introduce IDriver.TryVerifyConnectivityAsync #693 #See issue
  • Notifications Updates #691 Introduce better notifications, and configuration(Docs).

NotificationSeverity

Introduce NotificationSeverity enum represents to represent a notification's severity level.

Severities:

  • Warning
  • Information
  • Unknown

5.7 API Doc

NotificationCategory

Introduce NotificationCategory enum represents to represent a notification's category.

Categories:

  • Hint
  • Unrecognized
  • Unsupported
  • Performance
  • Deprecation
  • Generic
  • Unknown

5.7 API Doc

Notification

The INotification interface extended with 4 new properties:

  • NotificationSeverity SeverityLevel
  • string RawSeverityLevel
  • NotificationCategory Category
  • string RawCategory

The Raw prefixed properties return an unparsed string representation returned by the server. In case of an unrecognised values, both SeverityLevel and Category will be Unknown. This may happen if a new value is introduced in a future server version and a previous driver version does not support it. Additionally, Unknown may be returned when driver communicates with a server version that does not supply these values.

Deprecation ⚠️

The Severity property has been deprecated in favour of the RawSeverityLevel property.

5.7 API Doc

NotificationConfig

Introduce INotificationConfig type has been introduced to allow notification preferences management. By default, the server determines what notifications are provided to the driver. However, user can set a minimum severity level and/or a set of disabled notification categories to manage its expectations. This feature is only supported on Bolt protocol version 5.2(Introduced in server 5.7) and above.

Both the Config and the SessionConfig support this new configuration, configured with builders:

Introduce Severity(API Docs) & Category(API Docs) enums for configuration.

Notification Configuration Hierarchy

Servers will assess which notifications to emit based on a hierarchy, using the most recently declared values.

using var driver = GraphDatabase.Driver(Neo4jUrl, AuthToken, cb => cb.WithNotificationsDisabled());
using var session = driver.AsyncSession();
...
var summary = await cursor.ConsumeAsync();
// No notifications should be emitted.
// This is useful for helping the server optimize operations as the server doesn't need to assess for any notifications.
// Notifications are not sent over the wire too meaning less data! 
Debug.Assert(summary.Notifications.Count() == 0);

Severity configuration sets the minimum level of a notification, while category confugration is used to disable a category.

using var driver = GraphDatabase.Driver(Neo4jUrl, AuthToken, cb => cb.WithNotifications(Severity.Warning, null));
using var session = driver.AsyncSession(scb => scb.WithNotifications(null, new []{Category.Performance}));
...
var summary = await cursor.ConsumeAsync();
// no Information or performance notifications emitted.
Debug.Assert(summary.Notifications.Count(x => 
        x.NotificationCategory == NotificationCategory.Performance ||
        x.NotificationSeverity == NotificationSeverity.Information) == 0);

if you require to enable a previously disabled categories for a session you can emit it from disabledCategories parameter.

using var driver = GraphDatabase.Driver(Neo4jUrl, AuthToken, cb => cb.WithNotifications(null, new []{Category.Performance}));
using var session = driver.AsyncSession(scb => scb.WithNotifications(null, new Category[]{}));
...
var summary = await cursor.ConsumeAsync();
// Notifications can contain anything again!

Bolt

This update includes support for both 5.1 and 5.2 versions. The latter is required for the full support of the new notification updates.

5.6.0

No changes.

5.5.0

🔧 Fixes

  • The IsRetriable property on exceptions is now public

🔬 Experimental changes

  • The ExecutableQuery API has been added to the Experimental namespace (see here for more information)

5.4.0

🔧 Fixes

  • Add documentation for SessionConfigBuilder.WithDatabase and SessionConfig.Database
  • Exclude test code in snyk code analysis
  • TestKit backend: exclude txMeta from Cypher types
  • Add new exception types and change to explicitly identifying fast fail errors

5.3.0

🔬 Experimental bookmark manager changes:

  • Remove database notions from bookmark manager.
  • Fix Bookmark manager references outside of Neo4j.Driver.Experimental namespace.
  • When replacing LastBookmark with LastBookmarks we accidentally removed the old property, not following the planned deprecation policy. It is now restored and marked as obsolete, and due for removal in 6.0 of the driver.
  • Simplify creation of bookmark manager with default config.

5.2.0

🔬 Experimental change

  • Fixed an issue bookmark manager experimental classes: correctly exposing WithBookmarkManager to use bookmark managers on session configuration(#654).

5.1.0

No changes.

5.0.0

No changes.

5.0.0 (Beta02)

final tidying for major release.

Nuget

⭐ New Features

  • Introduce Experimental Bookmark Manager. (Not recommended for production use currently.) (#632)
    • Using Neo4j.Driver.Experimental.GraphDatabase.BookmarkManagerFactory users can create an IBookmarkManager.
    • IBookmarkManager can be passed to SessionConfigBuilder when creating a creating a session by using the Neo4j.Driver.Experimental.ExperimentalExtensions to add WithBookmarkManager to SessionConfigBuilder.
    • The Experimental methods will be finalized as:
      • Neo4j.Driver.Experimental.GraphDatabase.BookmarkManagerFactory -> Neo4j.Driver.GraphDatabase.BookmarkManagerFactory
      • Neo4j.Driver.Experimental.ExperimentalExtensions -> Neo4j.Driver.SessionConfigBuilder.

🔧 Fixes

  • Transaction lifetimes. (#640)
    • ⚠️ remaining managed transactions have been deprecated and replaced, removing the ability to commit or rollback transactions inside the unit of work scope.
      • ISession.ReadTransaction -> ISession.ExecuteRead
      • ISession.WriteTransaction -> ISession.ExecuteWrite
      • IRxSession.ReadTransaction -> IRxSession.ExecuteRead
      • IRxSession.WriteTransaction -> IRxSession.ExecuteWrite

🧹 Clean-up

  • Removal of 4.X Deprecations
    • Removal of IServerInfo.Version (#638)

5.0.0 (Beta01)

This release introduces full support for Neo4j 5.0 Servers.

Nuget

👏 .NET 6 Support

We now release for .NET 6.0 and .NET Standard 2.0.

⭐ New Features

  • Support for Bolt protocol version 5.0
    • ⚠️ Deprecate all IEntity integer ids replacing them with string ids:
      • IEntity.Id -> IEntity.ElementId
      • INode.Id -> INode.ElementId
      • IRelationship.Id -> IRelationship.ElementId
      • IRelationship.EndNodeId -> IRelationship.EndNodeElementId
      • IRelationship.StartNodeId -> IRelationship.StartNodeElementId
        (#573 #591 #600 #618)
    • Utc Encoding of ZonedDateTime (#630 #637)
  • SSL Configuration(#585)
    • SSL certificate trust rules can be set on driver initialization using ConfigBuilder.WithCertificateTrustRule
      • CertificateTrustRule.TrustSystem
        • Will verify certificates against the system's Certificate Authority store.
      • CertificateTrustRule.TrustList
        • Users can specify a collection of X509Certificate2 or paths to load as trusted certificates.
      • CertificateTrustRule.TrustAny
        • Will trust any SSL Cert.
    • ⚠️ Users can not use both ConfigBuilder.WithCertificateTrustRule and +s/+ssc in the url scheme at the same time.
  • Added Driver.GetServerInfoAsync. (#605)
    • Will verify connectivity and return a IServerInfo detailing server summary.
  • Added CanBeRetried to Exception. (#613)
    • All errors from driver that can be resolved by retrying an operation will return true.
  • Add IsOpen to Result cursors. (#610)
    • IsOpen will return if the underlying cursor is open to read records; Attempting to read from a closed cursor will throw a ResultConsumedException.
  • Connection Acquisition Timeout (#588)
    • ConfigBuilder.WithConnectionAcquisitionTimeout allows users to set maximum wait time to get a connection from the pool or create a new connection on driver initialization.
    • ⚠️ default: 60 seconds

🔧 Fixes

  • Transaction lifetimes. (#612)
    • ⚠️ Async managed transactions have been deprecated and replaced, removing the ability to commit or rollback transactions inside the unit of work scope.
      • IAsyncSession.ReadTransactionAsync -> IAsyncSession.ExecuteReadAsync
      • IAsyncSession.WriteTransactionAsync -> IAsyncSession.ExecuteWriteAsync
    • Attempting close a transaction after it has been closed will now throw a TransactionClosedException.
  • Rename Bookmark to Bookmarks. (#609)
    • ⚠️ Due to a mix of language Bookmark and all references to bookmarks have been pluralized as it allows for multiple values.
    • Bookmark -> Bookmarks
    • Session.LastBookmark -> Session.LastBookmarks
    • SessionConfigBuilder.WithBookmarks(Bookmark[]) -> SessionConfigBuilder.WithBookmarks(Bookmarks[])
  • Transaction timeout (#574)
    • TransactionConfigBuilder.WithTimeout now accepts Nullable<TimeSpan> for timeout.
      • ⚠️ null will use the server's default transaction timeout.
      • ⚠️ TimeSpan.Zero will remove timeout from transaction.
  • No longer throwing when using APOC procedures in a profiled query. (#633)
  • Discovery exceptions. (#594)
  • Error message handling. (#592)

Full Changelog: https://github.com/neo4j/neo4j-dotnet-driver/compare/4.4.0...5.0.0-beta01

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