SkuName.Upc改为*string（以支持null及添加唯一索引）

globals/refutil/refutil.go

@@ -92,5 +92,14 @@ func FilterMapByFieldList(mapData map[string]interface{}, fields []string) (vali
 }
 
 func IsValueEqual(value1, value2 interface{}) bool {
-	return fmt.Sprint(value1) == fmt.Sprint(value2)
+	return Interface2String(value1) == Interface2String(value2)
+}
+
+func Interface2String(value interface{}) (str string) {
+	valueType := reflect.TypeOf(value)
+	if valueType.Kind() == reflect.Ptr {
+		value = reflect.ValueOf(value).Elem()
+	}
+	str = fmt.Sprint(value)
+	return str
 }