//fortrade_servicetypeAmountConfigstruct{MaxCnyfloat64`thrift:"max_cny,1"json:"max_cny"`MaxBtcfloat64`thrift:"max_btc,2"json:"max_btc"`}//typeAmountConfigstruct{gorm.Modeltrade_service.AmountConfig//}funcgetAmountConfig()(amount_config*trade_service.AmountConfig,errerror){db,err:=getORMDB()iferr