calculate similarity at database level

MediaBrowser.ServerApplication/Native/DbConnector.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Data;
+using System.Data.SQLite;
+using System.Threading.Tasks;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Server.Implementations.Persistence;
+
+namespace MediaBrowser.ServerApplication.Native
+{
+    public class DbConnector : IDbConnector
+    {
+        private readonly ILogger _logger;
+
+        public DbConnector(ILogger logger)
+        {
+            _logger = logger;
+        }
+
+        public void BindSimilarityScoreFunction(IDbConnection connection)
+        {
+            SqliteExtensions.BindGetSimilarityScore(connection, _logger);
+        }
+
+        public async Task<IDbConnection> Connect(string dbPath)
+        {
+            try
+            {
+                return await SqliteExtensions.ConnectToDb(dbPath, _logger).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException("Error opening database {0}", ex, dbPath);
+
+                throw;
+            }
+        }
+    }
+}