/// <summary>

    /// sqlserver备份

    /// </summary>

    public class SqlserverBack : IBack

    {

        private string backPath = string.Empty;

        public SqlserverBack()

        {

            backPath = ConfigurationManager.AppSettings["backPath"];

        }

        public string Back(string connstr)

        {

            if (string.IsNullOrWhiteSpace(connstr))

            {

                throw new ArgumentNullException("连接字符串不能为空");

            }

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                conn.Open();

                string dbName = conn.Database;

                string backDirectory = Path.Combine(backPath, dbName);

                if (!Directory.Exists(backDirectory))

                {

                    Directory.CreateDirectory(backDirectory);

                }

                string backFileName = Path.Combine(backDirectory, $"{dbName}{DateTime.Now.ToString("yyyyMMddHHmmss")}.bak");

                string backSql = $"backup database {dbName} to disk='{backFileName}' WITH INIT;";

                SqlCommand cmd = new SqlCommand(backSql, conn);

                cmd.ExecuteNonQuery();

                return backFileName;

            }

        }

    }