Revert "Swap to dapper and system.text.json for database backend"

This reverts commit d2065bfa1b.

src/NzbDrone.Core.Test/Framework/DirectDataMapper.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.Data.Common;
 using System.Linq;
 using NzbDrone.Common.Serializer;
 using NzbDrone.Core.Datastore;
@@ -15,16 +16,27 @@ namespace NzbDrone.Core.Test.Framework
 
     public class DirectDataMapper : IDirectDataMapper
     {
-        private readonly IDatabase _database;
+        private readonly DbProviderFactory _providerFactory;
+        private readonly string _connectionString;
 
         public DirectDataMapper(IDatabase database)
         {
-            _database = database;
+            var dataMapper = database.GetDataMapper();
+            _providerFactory = dataMapper.ProviderFactory;
+            _connectionString = dataMapper.ConnectionString;
         }
         
+        private DbConnection OpenConnection()
+        {
+            var connection = _providerFactory.CreateConnection();
+            connection.ConnectionString = _connectionString;
+            connection.Open();
+            return connection;
+        }
+
         public DataTable GetDataTable(string sql)
         {
-            using (var connection = _database.OpenConnection())
+            using (var connection = OpenConnection())
             {
                 using (var cmd = connection.CreateCommand())
                 {