public static int GetParameterValue(string parameterName)
        {
            var ds = GetDataSet(connString, string.Format("select * from SystemParameter where ParameterName=‘{0}‘", parameterName));
            if (ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
            {
                int returnValue = http://www.mamicode.com/0;"ParameterValue"]);
                }
                catch
                {
                    throw new Exception("SQLite查询系统参数[" + parameterName + "]异常");
                }
                return returnValue;
            }
            else
            {
                throw new Exception("SQLite查询系统参数[" + parameterName + "]异常");
            }
        }