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Release Notes

Microsoft.Data.SqlClient 4.0.0-preview1.21237.2 released 25 August 2021

This update brings the below changes over the previous release:

Breaking changes over stable release 3.0.0

  • Changed Encrypt connection string property to be true by default. #1210 Read more
  • The driver now throws SqlException replacing AggregateException for active directory authentication modes. #1213
  • Dropped obsolete Asynchronous Processing connection property from .NET Framework. #1148

Added

  • Added SqlCommand.EnableOptimizedParameterBinding property that when enabled increases performance for commands with very large numbers of parameters. #1041 Read more
  • Included 42108 and 42109 error codes to retriable transient errors list. #1215
  • Added new App Context switch to use OS enabled client protocols only. #1168 Read more
  • Added PoolBlockingPeriod connection property support in .NET Standard. #1181
  • Added support for SqlDataReader.GetColumnSchema() in .NET Standard. #1181
  • Added PropertyGrid support with component model annotations to SqlConnectionStringBuilder properties for .NET Core. #1152

Fixed

  • Fixed issue with connectivity when TLS 1.3 is enabled on client and server. #1168
  • Fixed issue with connection encryption to ensure connections fail when encryption is required. #1210 Read more
  • Fixed issue where connection goes to unusable state. #1128
  • Fixed recursive calls to RetryLogicProvider when calling SqlCommand.ExecuteScalarAsync. #1220
  • Fixed async deadlock scenarios in web contexts with configurable retry logic provider. #1220
  • Fixed EntryPointNotFoundException in InOutOfProcHelper constructor. #1120
  • Fixed async thread blocking issues on SqlConnection.Open() for active directory authentication modes. #1213
  • Fixed driver behavior for Always Encrypted with secure enclaves to not fail when no user parameters have been provided. #1115
  • Fixed bug with LegacyRowVersionNullBehavior App Context switch. #1182
  • Fixed issues in Strings.resx file containing error messages. #1136 #1178

Changed

  • Updated error code to match with Windows when certificate validation fails in non-Windows client environments. #1130
  • Removed designer attributes from SqlCommand and SqlDataAdapter. #1132
  • Updated configurable retry logic default retriable error list. #1125
  • Improved performance by changing SqlParameter bool fields to flags. #1064
  • Improved performance by implementing static delegates. #1060
  • Optimized async method allocations in .NET Framework by porting changes from .NET Core. #1084
  • Various code improvements #902 #925 #933 #934 #1024 #1057 #1122 #1133 #1134 #1141 #1187 #1188 #1223 #1225 #1226

New features over stable release v3.0

Encrypt default value set to true

The default value of the Encrypt connection setting has been changed from false to true. With the growing use of cloud databases and the need to ensure those connections are secure, it's time for this backwards-compatibility-breaking change.

Ensure connections fail when encryption is required

In scenarios where client encryption libraries were disabled or unavailable, it was possible for unencrypted connections to be made when Encrypt was set to true or the server required encryption.

App Context Switch for using System default protocols

TLS 1.3 is not supported by the driver; therefore, it has been removed from the supported protocols list by default. Users can switch back to forcing use of Operating System's client protocols, by enabling the App Context switch below:

Switch.Microsoft.Data.SqlClient.UseSystemDefaultSecureProtocols

Enable optimized parameter binding

Microsoft.Data.SqlClient introduces new SqlCommand API, EnableOptimizedParameterBinding to improve performance of queries with large number of parameters. This property is disabled by default. When set to true, parameter names will not be sent to the SQL server when the command is executed.

public class SqlCommand
{
	public bool EnableOptimizedParameterBinding { get; set; }
}

Target Platform Support

  • .NET Framework 4.6.1+ (Windows x86, Windows x64)
  • .NET Core 2.1+ (Windows x86, Windows x64, Windows ARM64, Windows ARM, Linux, macOS)
  • .NET Standard 2.0+ (Windows x86, Windows x64, Windows ARM64, Windows ARM, Linux, macOS)

Dependencies

.NET Framework

  • Microsoft.Data.SqlClient.SNI 4.0.0-preview1.21232.1
  • Azure.Identity 1.3.0
  • Microsoft.Identity.Client 4.22.0
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 6.8.0
  • Microsoft.IdentityModel.JsonWebTokens 6.8.0
  • System.Configuration.ConfigurationManager 5.0.0
  • System.Text.Encodings.Web 4.7.2
  • System.Runtime.InteropServices.RuntimeInformation 4.3.0

.NET Core

  • Microsoft.Data.SqlClient.SNI.runtime 4.0.0-preview1.21232.1
  • Microsoft.Win32.Registry 5.0.0
  • System.Security.Principal.Windows 5.0.0
  • System.Text.Encoding.CodePages 5.0.0
  • System.Text.Encodings.Web 4.7.2
  • System.Diagnostics.DiagnosticSource 5.0.0
  • System.Configuration.ConfigurationManager 5.0.0
  • System.Runtime.Caching 5.0.0
  • Azure.Identity 1.3.0
  • Microsoft.Identity.Client 4.22.0
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 6.8.0
  • Microsoft.IdentityModel.JsonWebTokens 6.8.0

.NET Standard

  • Microsoft.Data.SqlClient.SNI.runtime 4.0.0-preview1.21232.1
  • Microsoft.Win32.Registry 5.0.0
  • System.Buffers 4.5.1
  • System.Memory 4.5.4
  • System.Security.Principal.Windows 5.0.0
  • System.Text.Encoding.CodePages 5.0.0
  • System.Text.Encodings.Web 4.7.2
  • System.Runtime.Caching 5.0.0
  • Azure.Identity 1.3.0
  • Microsoft.Identity.Client 4.22.0
  • Microsoft.IdentityModel.Protocols.OpenIdConnect 6.8.0
  • Microsoft.IdentityModel.JsonWebTokens 6.8.0
  • System.Configuration.ConfigurationManager 5.0.0
  • System.Runtime.Loader 4.3.0