Initial work on system for server settings

DeukBot4/Database/DatabaseInitializer.cs

@@ -18,6 +18,12 @@ namespace DeukBot4.Database
                                       "PRIMARY KEY(server_id, role_id)"               +
                                       ")";
                     cmd.ExecuteNonQuery();
+                    cmd.CommandText = "CREATE TABLE IF NOT EXISTS server_settings (" +
+                                      "server_id bigint NOT NULL,"                   +
+                                      "muted_role bigint NOT NULL,"                  +
+                                      "PRIMARY KEY(server_id)"                       +
+                                      ")";
+                    cmd.ExecuteNonQuery();
                 }
             }
         }

DeukBot4/Database/ServerSettings/ServerSetting.cs

@@ -0,0 +1,32 @@
+using DeukBot4.Utilities;
+using Npgsql;
+
+namespace DeukBot4.Database.ServerSettings
+{
+    public class ServerSetting
+    {
+        public ServerSetting(ulong serverId, ulong mutedRoleId = 0)
+        {
+            ServerId = serverId;
+            MutedRoleId = mutedRoleId;
+        }
+
+        public ulong ServerId { get; }
+        public ulong MutedRoleId { get; }
+
+        public void SetMutedRoleId(ulong id)
+        {
+            using (var conn = new DatabaseConnection())
+            {
+                using (var cmd = new NpgsqlCommand())
+                {
+                    cmd.Connection = conn;
+                    cmd.CommandText = "UPDATE server_settings SET muted_role = @val WHERE server_id = @key";
+                    cmd.Parameters.AddWithValue("val", id.ToLong());
+                    cmd.Parameters.AddWithValue("key", ServerId.ToLong());
+                    cmd.ExecuteNonQuery();
+                }
+            }
+        }
+    }
+}

DeukBot4/Database/ServerSettings/ServerSettingHandler.cs

@@ -0,0 +1,58 @@
+using System.Collections.Generic;
+using DeukBot4.Utilities;
+using Discord;
+using Npgsql;
+
+namespace DeukBot4.Database.ServerSettings
+{
+    public static class ServerSettingHandler
+    {
+        private static readonly Dictionary<ulong, ServerSetting> Settings = new Dictionary<ulong, ServerSetting>();
+
+        public static void OnBotStartUp()
+        {
+            using (var conn = new DatabaseConnection())
+            {
+                using (var cmd = new NpgsqlCommand())
+                {
+                    cmd.Connection  = conn;
+                    cmd.CommandText = "SELECT server_id muted_role FROM server_settings";
+                    var reader = cmd.ExecuteReader();
+                    while (reader.Read())
+                    {
+                        var id = reader.GetInt64(0).ToUlong();
+                        var mutedRole = reader.GetInt64(1).ToUlong();
+                        Settings.Add(id, new ServerSetting(id, mutedRole));
+                    }
+                }
+            }
+        }
+
+        private static void AddSettingsToDatabase(ServerSetting setting)
+        {
+            using (var conn = new DatabaseConnection())
+            {
+                using (var cmd = new NpgsqlCommand())
+                {
+                    cmd.Connection  = conn;
+                    cmd.CommandText = "INSERT INTO server_settings (server_id, muted_role) VALUES (@id, @muted)";
+                    cmd.Parameters.AddWithValue("id", setting.ServerId.ToLong());
+                    cmd.Parameters.AddWithValue("muted", setting.MutedRoleId.ToLong());
+                    cmd.ExecuteNonQuery();
+                }
+            }
+        }
+
+        public static ServerSetting GetSettings(ulong id)
+        {
+            if (Settings.TryGetValue(id, out var setting))
+            {
+                return setting;
+            }
+            setting = new ServerSetting(id);
+            Settings.Add(id, setting);
+            AddSettingsToDatabase(setting);
+            return setting;
+        }
+    }
+}