想在SqlDbHelper.cs类中加的垃圾方法

虽然没改写SqlDbHelper.cs类的能力，但好不容易想出来的，放着留个纪念~~~~~

        /**//// <summary>
        /// 执行SQL语句，返回第一行，第一列（sea）
        /// </summary>
        /// <param name="SQLString">sql语句</param>
        /// <param name="cmdParms">参数数组</param>
        /// <returns>int</returns>
        public int ExecuteSql4Value(string SQLString, params SqlParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(strConn))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object r = cmd.ExecuteScalar();
                        if (Object.Equals(r, null))
                        {
                            throw new Exception("value unavailable!");
                        }
                        else
                        {
                            try { int a = (int)r; }
                            catch { return 0; }
                            return (int)r;
                        }
                        
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        throw new Exception(E.Message);
                    }
                    finally
                    {
                        cmd.Parameters.Clear();
                    }
                }
            }
        }