Revert to Npgsql 5.0.10, v6 needs more effort to handle to many breaking changes

Author: mythz

src/ServiceStack.OrmLite.PostgreSQL/PostgreSQLDialectProvider.cs

@@ -21,7 +21,7 @@ namespace ServiceStack.OrmLite.PostgreSQL
 {
     public class PostgreSqlDialectProvider : OrmLiteDialectProviderBase<PostgreSqlDialectProvider>
     {
-        public static PostgreSqlDialectProvider Instance = new PostgreSqlDialectProvider();
+        public static PostgreSqlDialectProvider Instance = new();
 
         public bool UseReturningForLastInsertId { get; set; } = true;
 
@@ -72,8 +72,9 @@ public PostgreSqlDialectProvider()
             RegisterConverter<DateTimeOffset[]>(new PostgreSqlDateTimeOffsetTimeStampTzArrayConverter());
 
             RegisterConverter<XmlValue>(new PostgreSqlXmlConverter());
-            
+
 #if NET6_0
+            AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
             RegisterConverter<DateOnly>(new PostgreSqlDateOnlyConverter());
 #endif
 
@@ -85,8 +86,12 @@ public PostgreSqlDialectProvider()
                 { OrmLiteVariables.True, SqlBool(true) },                
                 { OrmLiteVariables.False, SqlBool(false) },                
             };
+            
+            //this.ExecFilter = new PostgreSqlExecFilter {
+            //    OnCommand = cmd => cmd.AllResultTypesAreUnknown = true
+            //};
         }
-
+        
         public bool UseHstore
         {
             set
@@ -118,7 +123,7 @@ public bool Normalize
         }
 
         //https://www.postgresql.org/docs/7.3/static/sql-keywords-appendix.html
-        public static HashSet<string> ReservedWords = new HashSet<string>(new[]
+        public static HashSet<string> ReservedWords = new(new[]
         {
             "ALL",
             "ANALYSE",

src/ServiceStack.OrmLite.PostgreSQL/PostgreSqlExecFilter.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Data;
+using Npgsql;
+
+namespace ServiceStack.OrmLite.PostgreSQL
+{
+    public class PostgreSqlExecFilter : OrmLiteExecFilter 
+    {
+        public Action<NpgsqlCommand> OnCommand { get; set; }
+
+        public override IDbCommand CreateCommand(IDbConnection dbConn)
+        {
+            var cmd = base.CreateCommand(dbConn);
+            if (OnCommand != null)
+            {
+                if (cmd.ToDbCommand() is NpgsqlCommand psqlCmd)
+                {
+                    OnCommand?.Invoke(psqlCmd);
+                }
+            }
+            return cmd;
+        }
+    }
+}

src/ServiceStack.OrmLite.PostgreSQL/ServiceStack.OrmLite.PostgreSQL.csproj

@@ -20,7 +20,7 @@
     <PackageReference Include="Npgsql" Version="6.0.0" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net6.0' ">
-    <PackageReference Include="Npgsql" Version="6.0.0" />
+    <PackageReference Include="Npgsql" Version="5.0.10" />
   </ItemGroup>
 
     <ItemGroup>

src/ServiceStack.OrmLite/OrmLiteDialectProviderBase.cs

@@ -167,7 +167,7 @@ public virtual void InitDbParam(IDbDataParameter dbParam, Type columnType)
 
         public IOrmLiteExecFilter ExecFilter { get; set; }
 
-        public Dictionary<Type, IOrmLiteConverter> Converters = new Dictionary<Type, IOrmLiteConverter>();
+        public Dictionary<Type, IOrmLiteConverter> Converters = new();
 
         public string AutoIncrementDefinition = "AUTOINCREMENT"; //SqlServer express limit