```csharp

//internal class UserInfo
    //{
    //    [PrimaryKey] [AutoIncrement] public int Id { get; set; }

    //    public string password { get; set; }
    //}
private static readonly string path = "ArchiWBSCode.db";
        private static readonly string path1 = "ts.db";

        private static readonly string pathS = "ArchiWBSCode.sqlite";
private static void CreateEncryptedDb(string newfilename, string password)
        {
            var conn = new SqliteConnectionStringBuilder
            {
                DataSource = newfilename,
                Mode = SqliteOpenMode.ReadWriteCreate,
                Password = password
            }.ToString(); //使用这个方式设置密码，避免sql注入
            //创建SQLite连接
            using (SqliteConnection connection = new SqliteConnection(conn))
            {
                if (connection.State == ConnectionState.Closed)
                {
                    connection.Open();
                    var createTableSqlStr =
                        @"CREATE TABLE  if not exists ""Alarm"" ( ""Id"" INTEGER NOT NULL, ""AlarmName"" TEXT, ""AlarmTypeId"" INTEGER, PRIMARY KEY ( ""Id"" ) );";
                    var result = connection.Execute(createTableSqlStr); //使用Dapper执行sql语句创建表
                    //Console.ReadKey();
                }
            }
        }

        private static int UpdatePassword(string fileName, string oldPassword, string newPassword)
        {
            var connectionString = new SqliteConnectionStringBuilder
            {
                DataSource = fileName,
                Mode = SqliteOpenMode.ReadWriteCreate,
                Password = oldPassword
            }.ToString();

            using (var connection = new SqliteConnection(connectionString))
            {
                connection.Open();
                using (var command = connection.CreateCommand())
                {
                    command.CommandText = "SELECT quote($newPassword);";
                    command.Parameters.AddWithValue("$newPassword", newPassword);
                    var quotedNewPassword = command.ExecuteScalar() as string;

                    command.CommandText = "PRAGMA rekey = " + quotedNewPassword;
                    command.Parameters.Clear();
                    int x = command.ExecuteNonQuery();
                    return x;
                }
            }
        }

        private string oldPassword = "123qwe";
        private string newPassword = "abcd";
```