fix codegen error in value-type multimap #2005

Dapper/SqlMapper.cs

@@ -1944,7 +1944,7 @@ private static Func<DbDataReader, object> GetDeserializer(Type type, DbDataReade
                 }
                 return GetTypeDeserializer(type, reader, startBound, length, returnNullIfFirstMissing);
             }
-            return GetStructDeserializer(type, underlyingType ?? type, startBound, useGetFieldValue);
+            return GetSimpleValueDeserializer(type, underlyingType ?? type, startBound, useGetFieldValue);
         }
 
         private static Func<DbDataReader, object> GetHandlerDeserializer(ITypeHandler handler, Type type, int startBound)
@@ -3049,7 +3049,7 @@ private static DbDataReader ExecuteReaderImpl(IDbConnection cnn, ref CommandDefi
             return paramReader;
         }
 
-        private static Func<DbDataReader, object> GetStructDeserializer(Type type, Type effectiveType, int index, bool useGetFieldValue)
+        private static Func<DbDataReader, object> GetSimpleValueDeserializer(Type type, Type effectiveType, int index, bool useGetFieldValue)
         {
             // no point using special per-type handling here; it boils down to the same, plus not all are supported anyway (see: SqlDataReader.GetChar - not supported!)
 #pragma warning disable 618
@@ -3578,8 +3578,11 @@ private static void GenerateDeserializerFromMap(Type type, DbDataReader reader,
                     if (first && returnNullIfFirstMissing)
                     {
                         il.Emit(OpCodes.Pop);
-                        il.Emit(OpCodes.Ldnull); // stack is now [null]
-                        il.Emit(OpCodes.Stloc, returnValueLocal);
+                        if (!type.IsValueType) // for struct, the retval is already initialized as default
+                        {
+                            il.Emit(OpCodes.Ldnull); // stack is now [null]
+                            il.Emit(OpCodes.Stloc, returnValueLocal);
+                        }
                         il.Emit(OpCodes.Br, allDone);
                     }
 

Directory.Build.props

@@ -21,7 +21,7 @@
     <IncludeSymbols>false</IncludeSymbols>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
-    <LangVersion>11</LangVersion>
+    <LangVersion>12</LangVersion>
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
     <PackageReadmeFile>readme.md</PackageReadmeFile>

Directory.Packages.props

@@ -1,46 +1,46 @@
 <Project>
     <ItemGroup>
       <!-- note: 6.2.0 has regressions; don't force the update -->
-      <PackageVersion Include="DuckDB.NET.Data.Full" Version="0.9.0.3" />
       <PackageVersion Include="EntityFramework" Version="6.1.3" />
       <PackageVersion Include="Microsoft.CSharp" Version="4.7.0" />
       <PackageVersion Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" />
-      <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
+      <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
       <PackageVersion Include="Microsoft.SqlServer.Types" Version="14.0.1016.290" />
       <PackageVersion Include="Nerdbank.GitVersioning" Version="3.6.133" />
       <PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.4" />
       <PackageVersion Include="System.Reflection.Emit.Lightweight" Version="4.7.0" />
 
       <!-- tests -->
       <PackageVersion Include="Belgrade.Sql.Client" Version="1.1.4" />
-      <PackageVersion Include="BenchmarkDotNet" Version="0.13.7" />
+      <PackageVersion Include="BenchmarkDotNet" Version="0.13.11" />
       <PackageVersion Include="Dashing" Version="2.10.0" />
       <PackageVersion Include="Dapper.Contrib" Version="2.0.78" />
-      <PackageVersion Include="DevExpress.Xpo" Version="23.1.4" />
-      <PackageVersion Include="FirebirdSql.Data.FirebirdClient" Version="9.1.1" />
-      <PackageVersion Include="GitHubActionsTestLogger" Version="2.3.2" />
+      <PackageVersion Include="DuckDB.NET.Data.Full" Version="0.9.2" />
+      <PackageVersion Include="DevExpress.Xpo" Version="23.2.3" />
+      <PackageVersion Include="FirebirdSql.Data.FirebirdClient" Version="10.0.0" />
+      <PackageVersion Include="GitHubActionsTestLogger" Version="2.3.3" />
       <PackageVersion Include="Iesi.Collections" Version="4.0.5" />
       <PackageVersion Include="linq2db.SqlServer" Version="3.7.0" />
-      <PackageVersion Include="Microsoft.Data.SqlClient" Version="5.1.1" />
+      <PackageVersion Include="Microsoft.Data.SqlClient" Version="5.1.2" />
       <PackageVersion Include="Microsoft.Data.Sqlite" Version="8.0.0" />
       <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.0" />
-      <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.7.1" />
+      <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
       <PackageVersion Include="Mighty" Version="3.2.0" />
-      <PackageVersion Include="MySqlConnector" Version="2.2.7" />
-      <PackageVersion Include="NHibernate" Version="5.4.5" />
-      <PackageVersion Include="Norm.net" Version="5.3.7" />
-      <PackageVersion Include="Npgsql" Version="7.0.4" />
+      <PackageVersion Include="MySqlConnector" Version="2.3.3" />
+      <PackageVersion Include="NHibernate" Version="5.5.0" />
+      <PackageVersion Include="Norm.net" Version="5.4.0" />
+      <PackageVersion Include="Npgsql" Version="8.0.1" />
       <PackageVersion Include="PetaPoco" Version="5.1.306" />
       <PackageVersion Include="RepoDb.SqlServer" Version="1.13.1" />
       <PackageVersion Include="ServiceStack.OrmLite.SqlServer" Version="6.10.0" />
-      <PackageVersion Include="Snowflake.Data" Version="2.1.0" />
+      <PackageVersion Include="Snowflake.Data" Version="2.1.5" />
       <PackageVersion Include="SqlMarshal" Version="0.4.4" />
       <PackageVersion Include="SubSonic" Version="3.0.0.4" />
       <PackageVersion Include="Susanoo.SqlServer" Version="1.2.4.2" />
       <PackageVersion Include="System.Data.SqlClient" Version="4.8.5" />
       <PackageVersion Include="System.Data.SQLite" Version="1.0.118" />
       <PackageVersion Include="System.ValueTuple" Version="4.5.0" />
-      <PackageVersion Include="xunit" Version="2.5.0" />
-      <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.0" />
+      <PackageVersion Include="xunit" Version="2.6.4" />
+      <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
     </ItemGroup>
 </Project>

appveyor.yml

@@ -7,7 +7,7 @@ skip_commits:
     - '**/*.md'
 
 install:
-  - choco install dotnet-sdk --version 7.0.402
+  - choco install dotnet-sdk --version 8.0.100
 
 environment:
   Appveyor: true

benchmarks/Dapper.Tests.Performance/DapperCacheImpact.cs

@@ -10,7 +10,7 @@ public class DapperCacheImpact : BenchmarkBase
         [GlobalSetup]
         public void Setup() => BaseSetup();
 
-        private object args = new { Id = 42, Name = "abc" };
+        private readonly object args = new { Id = 42, Name = "abc" };
 
         public class Foo
         {

benchmarks/Dapper.Tests.Performance/LegacyTests.cs

@@ -128,6 +128,7 @@ private static void Try(Action action, string blame)
             }
         }
 
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1806:Do not ignore method results", Justification = "Intentional - just make sure we have something")]
         public async Task RunAsync(int iterations)
         {
             using (var connection = GetOpenConnection())

global.json

@@ -0,0 +1,5 @@
+{
+  "sdk": {
+    "version": "8.0.100"
+  }
+}

tests/Dapper.Tests/Dapper.Tests.csproj

@@ -2,9 +2,9 @@
   <PropertyGroup>
     <AssemblyName>Dapper.Tests</AssemblyName>
     <Description>Dapper Core Test Suite</Description>
-    <TargetFrameworks>net472;net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>net472;net6.0;net8.0</TargetFrameworks>
     <DefineConstants>$(DefineConstants);MSSQLCLIENT</DefineConstants>
-    <NoWarn>$(NoWarn);IDE0017;IDE0034;IDE0037;IDE0039;IDE0042;IDE0044;IDE0051;IDE0052;IDE0059;IDE0060;IDE0063;IDE1006;xUnit1004;CA1806;CA1816;CA1822;CA1825;CA2208</NoWarn>
+    <NoWarn>$(NoWarn);IDE0017;IDE0034;IDE0037;IDE0039;IDE0042;IDE0044;IDE0051;IDE0052;IDE0059;IDE0060;IDE0063;IDE1006;xUnit1004;CA1806;CA1816;CA1822;CA1825;CA2208;CA1861</NoWarn>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 

tests/Dapper.Tests/MiscTests.cs

@@ -1310,5 +1310,16 @@ public HazGetOnlyAndCtor(int idProperty, string nameProperty)
                 NameProperty = nameProperty;
             }
         }
+
+        internal record struct One(int OID);
+        internal record struct Two(int OID, string Name);
+
+        [Fact]
+        public async Task QuerySplitStruct() // https://github.com/DapperLib/Dapper/issues/2005
+        {
+            var results = await connection.QueryAsync<One, Two, (One,Two)>(@"SELECT 1 AS OID, 2 AS OID, 'Name' AS Name", (x,y) => (x,y), splitOn: "OID");
+
+            Assert.Single(results);
+        }
     }
 }

tests/Dapper.Tests/Providers/FirebirdTests.cs

@@ -33,7 +33,7 @@ public void Issue178_Firebird()
             connection.Execute("insert into Issue178(id) values(42)");
             // raw ADO.net
             using (var sqlCmd = new FbCommand(sql, connection))
-            using (IDataReader reader1 = sqlCmd.ExecuteReader())
+            using (var reader1 = sqlCmd.ExecuteReader())
             {
                 Assert.True(reader1.Read());
                 Assert.Equal(1, reader1.GetInt32(0));

tests/Dapper.Tests/Providers/PostgresqlTests.cs

@@ -49,7 +49,7 @@ public void TestPostgresqlArrayParameters()
         {
             using var conn = GetOpenNpgsqlConnection();
 
-            IDbTransaction transaction = conn.BeginTransaction();
+            var transaction = conn.BeginTransaction();
             conn.Execute("create table tcat ( id serial not null, breed character varying(20) not null, name character varying (20) not null);");
             conn.Execute("insert into tcat(breed, name) values(:Breed, :Name) ", Cats);
 
@@ -66,7 +66,7 @@ public void TestPostgresqlListParameters()
         {
             using var conn = GetOpenNpgsqlConnection();
 
-            IDbTransaction transaction = conn.BeginTransaction();
+            var transaction = conn.BeginTransaction();
             conn.Execute("create table tcat ( id serial not null, breed character varying(20) not null, name character varying (20) not null);");
             conn.Execute("insert into tcat(breed, name) values(:Breed, :Name) ", new List<Cat>(Cats));