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User Story 37737: Prepare release notes for v6.1-preview2
- Updated release notes to call out our major additions with impact.
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‎CHANGELOG.md‎

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@@ -6,97 +6,149 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
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# Release Notes
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## [Preiew Release 6.1.0-preview2.TODO] - 2025-06-26
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## [Preiew Release 6.1.0-preview2.TODO] - 2025-06-27
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This update brings the following changes since the [6.1.0-preview1](release-notes/6.1/6.1.0-preview1.md) release:
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### Added
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- Revived .NET Standard 2.0 target support.
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[#3381](https://github.com/dotnet/SqlClient/pull/3381)
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- Added dedicated SQL Server vector datatype support.
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- Added `ToString()` override to `SqlJson`.
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[#3427](https://github.com/dotnet/SqlClient/pull/3427)
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#### Added dedicated SQL Server vector datatype support
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*What Changed:*
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- Optimized vector communications between MDS and SQL Server 2025, employing a
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custom binary format over the TDS protocol.
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([#3433](https://github.com/dotnet/SqlClient/pull/3433),
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[#3443](https://github.com/dotnet/SqlClient/pull/3443))
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- Reduced processing load compared to existing JSON-based vector support.
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- Initial support for 32-bit single-precision floating point vectors.
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*Who Benefits:*
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- Applications moving large vector data sets will see beneficial improvements
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to processing times and memory requirements.
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- Vector-specific APIs are ready to support future numeric representations with
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a consistent look-and-feel.
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*Impact:*
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- Reduced transmission and processing times for vector operations versus JSON
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using SQL Server 2025 preview:
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- Reads: 50x improvement
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- Writes: 3.3x improvement
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- Bulk Copy: 19x improvement
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- (Observed with vector column of max 1998 size, and 10,000 records for each
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operation.)
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- Improved memory footprint due to the elimination of JSON
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serialization/deserialization and string representation bloat.
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- For backwards compatibility with earlier SQL Server Vector implementations,
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applications may continue to use JSON strings to send/receive vector data,
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although they will not see any of the performance improvements noted above.
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#### Revived .NET Standard 2.0 target support
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*What Changed:*
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- Support for targeting .NET Standard 2.0 has returned.
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([#3381](https://github.com/dotnet/SqlClient/pull/3381))
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- Support had previously been removed in the 6.0 release, with the
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[community voicing concerns](https://github.com/dotnet/SqlClient/discussions/3115).
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*Who Benefits:*
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- Applications or libraries that depend on MDS may seamlessly target any of
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the following frameworks:
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- .NET Standard 2.0
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- .NET Framework 4.6.2 and above
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- .NET 8.0
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- .NET 9.0
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*Impact:*
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- Applications or libraries targeting .NET Standard 2.0 will no longer
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receive warnings like this:
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- `warning NU1701: Package 'Microsoft.Data.SqlClient 6.0.2' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.`
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### Fixed
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- Fixed missing <NeutralLanguage> property.
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[#3325](https://github.com/dotnet/SqlClient/pull/3325)
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([#3325](https://github.com/dotnet/SqlClient/pull/3325))
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- Fixed injection of UTF-8 BOM during bulk copy.
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[#3399](https://github.com/dotnet/SqlClient/pull/3399)
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([#3399](https://github.com/dotnet/SqlClient/pull/3399))
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- Fixed `SqlCachedBuffer` async read edge case.
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[#3329](https://github.com/dotnet/SqlClient/pull/3329)
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([#3329](https://github.com/dotnet/SqlClient/pull/3329))
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- Fixed `SqlSequentialTextReader` edge case with single-byte reads.
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[#3383](https://github.com/dotnet/SqlClient/pull/3383)
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([#3383](https://github.com/dotnet/SqlClient/pull/3383))
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- Fixed an incorrect error message when parsing connection string `PoolBlockingPeriod`.
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[#3411](https://github.com/dotnet/SqlClient/pull/3411)
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([#3411](https://github.com/dotnet/SqlClient/pull/3411))
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- Added missing `ToString()` override to `SqlJson`.
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([#3427](https://github.com/dotnet/SqlClient/pull/3427))
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### Changed
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- Reduced allocations when opening a connection.
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[#3364](https://github.com/dotnet/SqlClient/pull/3364)
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([#3364](https://github.com/dotnet/SqlClient/pull/3364))
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- Various performance improvements related to TDS parsing.
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[#3337](https://github.com/dotnet/SqlClient/pull/3337)
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[#3377](https://github.com/dotnet/SqlClient/pull/3377)
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[#3422](https://github.com/dotnet/SqlClient/pull/3422)
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([#3337](https://github.com/dotnet/SqlClient/pull/3337),
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[#3377](https://github.com/dotnet/SqlClient/pull/3377),
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[#3422](https://github.com/dotnet/SqlClient/pull/3422))
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- Improved native AOT support.
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[#3364](https://github.com/dotnet/SqlClient/pull/3364)
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[#3369](https://github.com/dotnet/SqlClient/pull/3369)
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[#3401](https://github.com/dotnet/SqlClient/pull/3401)
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- Progress towards SSPI extensibility
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[Issue #2253](https://github.com/dotnet/SqlClient/issues/2253).
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[#2454](https://github.com/dotnet/SqlClient/pull/2454)
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- Progress towards connection pooling improvements
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[Issue #3356](https://github.com/dotnet/SqlClient/issues/3356).
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[#3352](https://github.com/dotnet/SqlClient/pull/3352)
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[#3396](https://github.com/dotnet/SqlClient/pull/3396)
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([#3364](https://github.com/dotnet/SqlClient/pull/3364),
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[#3369](https://github.com/dotnet/SqlClient/pull/3369),
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[#3401](https://github.com/dotnet/SqlClient/pull/3401))
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- Progress towards [SSPI extensibility](https://github.com/dotnet/SqlClient/issues/2253).
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([#2454](https://github.com/dotnet/SqlClient/pull/2454))
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- Progress towards [connection pooling improvements](https://github.com/dotnet/SqlClient/issues/3356).
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([#3352](https://github.com/dotnet/SqlClient/pull/3352),
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[#3396](https://github.com/dotnet/SqlClient/pull/3396))
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- Expanded/clarified SqlConnection's
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[AccessToken](https://learn.microsoft.com/en-us/dotnet/api/microsoft.data.sqlclient.sqlconnection.accesstoken) and
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[AccessTokenCallback](https://learn.microsoft.com/en-us/dotnet/api/microsoft.data.sqlclient.sqlconnection.accesstokencallback)
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documentation.
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[#3339](https://github.com/dotnet/SqlClient/pull/3339)
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([#3339](https://github.com/dotnet/SqlClient/pull/3339))
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- Fixed some poorly formatted tables in the API docs.
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[#3391](https://github.com/dotnet/SqlClient/pull/3391)
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([#3391](https://github.com/dotnet/SqlClient/pull/3391))
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- Code merge towards a unified SqlClient project, aligning .NET Framework and
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.NET Core implementations.
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[#3262](https://github.com/dotnet/SqlClient/pull/3262)
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[#3291](https://github.com/dotnet/SqlClient/pull/3291)
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[#3305](https://github.com/dotnet/SqlClient/pull/3305)
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[#3306](https://github.com/dotnet/SqlClient/pull/3306)
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[#3310](https://github.com/dotnet/SqlClient/pull/3310)
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[#3323](https://github.com/dotnet/SqlClient/pull/3323)
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[#3326](https://github.com/dotnet/SqlClient/pull/3326)
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[#3335](https://github.com/dotnet/SqlClient/pull/3335)
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[#3338](https://github.com/dotnet/SqlClient/pull/3338)
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[#3340](https://github.com/dotnet/SqlClient/pull/3340)
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[#3341](https://github.com/dotnet/SqlClient/pull/3341)
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[#3343](https://github.com/dotnet/SqlClient/pull/3343)
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[#3345](https://github.com/dotnet/SqlClient/pull/3345)
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[#3353](https://github.com/dotnet/SqlClient/pull/3353)
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[#3355](https://github.com/dotnet/SqlClient/pull/3355)
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[#3368](https://github.com/dotnet/SqlClient/pull/3368)
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[#3373](https://github.com/dotnet/SqlClient/pull/3373)
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[#3376](https://github.com/dotnet/SqlClient/pull/3376)
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[#3388](https://github.com/dotnet/SqlClient/pull/3388)
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[#3389](https://github.com/dotnet/SqlClient/pull/3389)
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[#3393](https://github.com/dotnet/SqlClient/pull/3393)
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[#3405](https://github.com/dotnet/SqlClient/pull/3405)
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[#3414](https://github.com/dotnet/SqlClient/pull/3414)
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[#3416](https://github.com/dotnet/SqlClient/pull/3416)
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[#3417](https://github.com/dotnet/SqlClient/pull/3417)
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[#3420](https://github.com/dotnet/SqlClient/pull/3420)
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[#3431](https://github.com/dotnet/SqlClient/pull/3431)
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([#3262](https://github.com/dotnet/SqlClient/pull/3262),
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[#3291](https://github.com/dotnet/SqlClient/pull/3291),
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[#3305](https://github.com/dotnet/SqlClient/pull/3305),
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[#3306](https://github.com/dotnet/SqlClient/pull/3306),
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[#3310](https://github.com/dotnet/SqlClient/pull/3310),
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[#3323](https://github.com/dotnet/SqlClient/pull/3323),
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[#3326](https://github.com/dotnet/SqlClient/pull/3326),
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[#3335](https://github.com/dotnet/SqlClient/pull/3335),
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[#3338](https://github.com/dotnet/SqlClient/pull/3338),
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[#3340](https://github.com/dotnet/SqlClient/pull/3340),
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[#3341](https://github.com/dotnet/SqlClient/pull/3341),
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[#3343](https://github.com/dotnet/SqlClient/pull/3343),
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[#3345](https://github.com/dotnet/SqlClient/pull/3345),
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[#3353](https://github.com/dotnet/SqlClient/pull/3353),
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[#3355](https://github.com/dotnet/SqlClient/pull/3355),
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[#3368](https://github.com/dotnet/SqlClient/pull/3368),
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[#3373](https://github.com/dotnet/SqlClient/pull/3373),
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[#3376](https://github.com/dotnet/SqlClient/pull/3376),
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[#3388](https://github.com/dotnet/SqlClient/pull/3388),
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[#3389](https://github.com/dotnet/SqlClient/pull/3389),
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[#3393](https://github.com/dotnet/SqlClient/pull/3393),
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[#3405](https://github.com/dotnet/SqlClient/pull/3405),
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[#3414](https://github.com/dotnet/SqlClient/pull/3414),
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[#3416](https://github.com/dotnet/SqlClient/pull/3416),
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[#3417](https://github.com/dotnet/SqlClient/pull/3417),
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[#3420](https://github.com/dotnet/SqlClient/pull/3420),
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[#3431](https://github.com/dotnet/SqlClient/pull/3431),
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[#3438](https://github.com/dotnet/SqlClient/pull/3438))
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- Test improvements include a new unit test project, updates to test
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dependencies, removal of hardcoded credentials, and improved robustness.
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[#3204](https://github.com/dotnet/SqlClient/pull/3204)
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[#3379](https://github.com/dotnet/SqlClient/pull/3379)
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[#3380](https://github.com/dotnet/SqlClient/pull/3380)
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[#3402](https://github.com/dotnet/SqlClient/pull/3402)
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([#3204](https://github.com/dotnet/SqlClient/pull/3204),
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[#3379](https://github.com/dotnet/SqlClient/pull/3379),
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[#3380](https://github.com/dotnet/SqlClient/pull/3380),)
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[#3402](https://github.com/dotnet/SqlClient/pull/3402)
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- Added dependency on `System.Text.Json`
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[8.0.5](https://www.nuget.org/packages/System.Text.Json/8.0.5) (.NET 8.0) and
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[9.0.5](https://www.nuget.org/packages/System.Text.Json/9.0.5) (.NET Standard 2.0, .NET 9.0)
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to avoid transitive vulnerabilities ([CVE-2024-43485](https://github.com/advisories/GHSA-8g4q-xg66-9fp4)).
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[#3403](https://github.com/dotnet/SqlClient/pull/3403)
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([#3403](https://github.com/dotnet/SqlClient/pull/3403))
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## [Preview Release 6.1.0-preview1.25120.4] - 2025-04-30
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