Remove dependency of Oqtane.Server on SqlClient

Oqtane.Database.PostgreSQL/PostgreSQLDatabase.cs

@@ -1,12 +1,11 @@
 using System;
-using System.Collections.Generic;
+using System.Data;
 using System.Globalization;
 using EFCore.NamingConventions.Internal;
 using Microsoft.EntityFrameworkCore;
-using Microsoft.EntityFrameworkCore.Metadata.Internal;
 using Microsoft.EntityFrameworkCore.Migrations.Operations;
 using Microsoft.EntityFrameworkCore.Migrations.Operations.Builders;
-using Oqtane.Models;
+using Npgsql;
 using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 using Oqtane.Shared;
 
@@ -47,6 +46,36 @@ namespace Oqtane.Database.PostgreSQL
             return returnValue;
         }
 
+        public override int ExecuteNonQuery(string connectionString, string query)
+        {
+            var conn = new NpgsqlConnection(connectionString);
+            var cmd = conn.CreateCommand();
+            using (conn)
+            {
+                PrepareCommand(conn, cmd, query);
+                var val = -1;
+                try
+                {
+                    val = cmd.ExecuteNonQuery();
+                }
+                catch
+                {
+                    // an error occurred executing the query
+                }
+                return val;
+            }
+
+        }
+
+        public override IDataReader ExecuteReader(string connectionString, string query)
+        {
+            var conn = new NpgsqlConnection(connectionString);
+            var cmd = conn.CreateCommand();
+            PrepareCommand(conn, cmd, query);
+            var dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
+            return dr;
+        }
+
         public override string RewriteName(string name)
         {
             return _rewriter.RewriteName(name);
@@ -85,5 +114,17 @@ namespace Oqtane.Database.PostgreSQL
         {
             return optionsBuilder.UseNpgsql(connectionString).UseSnakeCaseNamingConvention();
         }
+
+        private void PrepareCommand(NpgsqlConnection conn, NpgsqlCommand cmd, string query)
+        {
+            if (conn.State != ConnectionState.Open)
+            {
+                conn.Open();
+            }
+
+            cmd.Connection = conn;
+            cmd.CommandText = query;
+            cmd.CommandType = CommandType.Text;
+        }
     }
 }