Set TargetFrameworks solely to "netstandard2.0"

Respawn/IDbAdapter.cs

@@ -14,9 +14,6 @@ public interface IDbAdapter
         string BuildReseedSql(IEnumerable<Table> tablesToDelete);
         string BuildTurnOffSystemVersioningCommandText(IEnumerable<TemporalTable> tablesToTurnOffSystemVersioning);
         string BuildTurnOnSystemVersioningCommandText(IEnumerable<TemporalTable> tablesToTurnOnSystemVersioning);
-        Task<bool> CheckSupportsTemporalTables(DbConnection connection)
-        {
-            return Task.FromResult(false);
-        }
+        Task<bool> CheckSupportsTemporalTables(DbConnection connection);
     }
 }

Respawn/Respawn.csproj

@@ -4,7 +4,7 @@
     <Description>Intelligent resetting for database tests</Description>
     <Copyright>Copyright Jimmy Bogard</Copyright>
     <Authors>Jimmy Bogard</Authors>
-    <TargetFrameworks>netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
     <AssemblyName>Respawn</AssemblyName>
     <PackageId>Respawn</PackageId>
     <PackageTags>tests;integration tests;database tests</PackageTags>
@@ -26,9 +26,10 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Bcl.HashCode" Version="1.1.1" Condition="'$(TargetFramework)' == 'netstandard2.0'"/>
     <PackageReference Include="Microsoft.Data.SqlClient" Version="4.0.5" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
     <PackageReference Include="MinVer" Version="2.5.0" PrivateAssets="All" />
   </ItemGroup>
-  
+
 </Project>

Respawn/Respawner.cs

@@ -36,9 +36,15 @@ public static async Task<Respawner> CreateAsync(string nameOrConnectionString, R
                 throw new ArgumentException("This overload only supports the SqlDataAdapter. To use an alternative adapter, use the overload that supplies a DbConnection.", nameof(options.DbAdapter));
             }
 
+#if NETSTANDARD2_0
+            using var connection = new SqlConnection(nameOrConnectionString);
+
+            connection.Open();
+#else
             await using var connection = new SqlConnection(nameOrConnectionString);
 
             await connection.OpenAsync();
+#endif
 
             var respawner = new Respawner(options);
 
@@ -48,7 +54,7 @@ public static async Task<Respawner> CreateAsync(string nameOrConnectionString, R
         }
 
         /// <summary>
-        /// Creates a <see cref="Respawner"/> based on the supplied connection and options. 
+        /// Creates a <see cref="Respawner"/> based on the supplied connection and options.
         /// </summary>
         /// <param name="connection">Connection object for your target database</param>
         /// <param name="options">Options</param>
@@ -67,9 +73,15 @@ public static async Task<Respawner> CreateAsync(DbConnection connection, Respawn
 
         public virtual async Task ResetAsync(string nameOrConnectionString)
         {
+#if NETSTANDARD2_0
+            using var connection = new SqlConnection(nameOrConnectionString);
+
+            connection.Open();
+#else
             await using var connection = new SqlConnection(nameOrConnectionString);
 
             await connection.OpenAsync();
+#endif
 
             await ResetAsync(connection);
         }
@@ -98,22 +110,36 @@ public virtual async Task ResetAsync(DbConnection connection)
 
         private async Task ExecuteAlterSystemVersioningAsync(DbConnection connection, string commandText)
         {
+#if NETSTANDARD2_0
+            using var tx = connection.BeginTransaction();
+            using var cmd = connection.CreateCommand();
+#else
             await using var tx = await connection.BeginTransactionAsync();
             await using var cmd = connection.CreateCommand();
+#endif
 
             cmd.CommandTimeout = Options.CommandTimeout ?? cmd.CommandTimeout;
             cmd.CommandText = commandText;
             cmd.Transaction = tx;
 
             await cmd.ExecuteNonQueryAsync();
 
+#if NETSTANDARD2_0
+            tx.Commit();
+#else
             await tx.CommitAsync();
+#endif
         }
 
         private async Task ExecuteDeleteSqlAsync(DbConnection connection)
         {
+#if NETSTANDARD2_0
+            using var tx = connection.BeginTransaction();
+            using var cmd = connection.CreateCommand();
+#else
             await using var tx = await connection.BeginTransactionAsync();
             await using var cmd = connection.CreateCommand();
+#endif
 
             cmd.CommandTimeout = Options.CommandTimeout ?? cmd.CommandTimeout;
             cmd.CommandText = DeleteSql;
@@ -127,7 +153,11 @@ private async Task ExecuteDeleteSqlAsync(DbConnection connection)
                 await cmd.ExecuteNonQueryAsync();
             }
 
+#if NETSTANDARD2_0
+            tx.Commit();
+#else
             await tx.CommitAsync();
+#endif
         }
 
         private async Task BuildDeleteTables(DbConnection connection)
@@ -158,11 +188,19 @@ private async Task<HashSet<Relationship>> GetRelationships(DbConnection connecti
             var relationships = new HashSet<Relationship>();
             var commandText = Options.DbAdapter.BuildRelationshipCommandText(Options);
 
+#if NETSTANDARD2_0
+            using var cmd = connection.CreateCommand();
+
+            cmd.CommandText = commandText;
+
+            using var reader = cmd.ExecuteReader();
+#else
             await using var cmd = connection.CreateCommand();
 
             cmd.CommandText = commandText;
 
             await using var reader = await cmd.ExecuteReaderAsync();
+#endif
 
             while (await reader.ReadAsync())
             {
@@ -181,11 +219,19 @@ private async Task<HashSet<Table>> GetAllTables(DbConnection connection)
 
             var commandText = Options.DbAdapter.BuildTableCommandText(Options);
 
+#if NETSTANDARD2_0
+            using var cmd = connection.CreateCommand();
+
+            cmd.CommandText = commandText;
+
+            using var reader = cmd.ExecuteReader();
+#else
             await using var cmd = connection.CreateCommand();
 
             cmd.CommandText = commandText;
 
             await using var reader = await cmd.ExecuteReaderAsync();
+#endif
 
             while (await reader.ReadAsync())
             {
@@ -201,11 +247,19 @@ private async Task<IList<TemporalTable>> GetAllTemporalTables(DbConnection conne
 
             var commandText = Options.DbAdapter.BuildTemporalTableCommandText(Options);
 
+#if NETSTANDARD2_0
+            using var cmd = connection.CreateCommand();
+
+            cmd.CommandText = commandText;
+
+            using var reader = cmd.ExecuteReader();
+#else
             await using var cmd = connection.CreateCommand();
 
             cmd.CommandText = commandText;
 
             await using var reader = await cmd.ExecuteReaderAsync();
+#endif
 
             while (await reader.ReadAsync())
             {

Respawn/SqlServerDbAdapter.cs

@@ -317,7 +317,11 @@ public async Task<bool> CheckSupportsTemporalTables(DbConnection connection)
 
         private static async Task<int> GetEngineEdition(DbConnection connection)
         {
+#if NETSTANDARD2_0
+            using var command = connection.CreateCommand();
+#else
             await using var command = connection.CreateCommand();
+#endif
             command.CommandText = @"
 SELECT SERVERPROPERTY('EngineEdition');";
             var engineEdition = await command.ExecuteScalarAsync();
@@ -326,7 +330,11 @@ private static async Task<int> GetEngineEdition(DbConnection connection)
 
         private static async Task<byte> GetCompatibilityLevel(DbConnection connection)
         {
+#if NETSTANDARD2_0
+            using var command = connection.CreateCommand();
+#else
             await using var command = connection.CreateCommand();
+#endif
             command.CommandText = $@"
 SELECT compatibility_level
 FROM sys.databases