preserve values unless item is set

ews/ews.go

@@ -210,31 +210,33 @@ func (e *EWS) SetUutInfo(cfg cnf.Cfg, logger *log.Logger, host string, addr stri
 		return rst
 	}
 
-	//如果部分客户端参数为空, 则保留uutinfo表中已存在记录的值
+	//如果测试项不为空(第一个心跳包), 当部分客户端参数为空, 则保留uutinfo表中已存在记录的值
 	mac := params["MAC"]
+	pn := params["PARTNO"]
+	mo := params["MO"]
+	sku := params["SKU"]
+	line := params["LINE"]
+	stage := params["STAGE"]
+	if params["ITEM"] != "" {
 		if mac == "" {
 			mac = ui.MAC
 		}
-	pn := params["PARTNO"]
 		if pn == "" {
 			pn = ui.PartNO
 		}
-	mo := params["MO"]
 		if mo == "" {
 			mo = ui.MfgMO
 		}
-	sku := params["SKU"]
 		if sku == "" {
 			sku = ui.MfgSKU
 		}
-	line := params["LINE"]
 		if line == "" {
 			line = ui.MfgLine
 		}
-	stage := params["STAGE"]
 		if stage == "" {
 			stage = ui.MfgStage
 		}
+	}
 
 	//如果此USN的记录存在于uutinfo表中, 且此USN的Relay/MAC/Item/Status/Message已变化, 则:
 	//1. 备份此USN对应记录行到uutinfobkup表