Retrieve Value of a Table Parameter by Index of a Remote Element in a Connector

Solved936 viewsConnector QAction table parameter
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Hi,

What is the best approach to retrieve a value of a single table parameter by index from a remote element in a DMS in a connector QAction? DmaID, ElementId, ParameterID and Index are known.

The method NT_GET_PARAMETER (73)  (protocol.NotifyDataMiner) does not allow a parameter index, presumably used only for non-table params.

The method  DMS_GET_VALUE (87)   retrieves the whole table which then has to be iterated over, which is not very efficient.

The Skyline.DataMiner.Library’s element only features a GetStandaloneParameter and then a full GetTable method, which is same as above.

Can you please advise on best way and possibly provide an example or link documenting the method?

Thank you.

Martin Vrzba [DevOps Advocate] Selected answer as best 2nd December 2022

1 Answer

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8.95K 2 Comments

Hi Martin, the recommended way to retrieve a single cell from another element is using Skyline.DataMiner.Library. This doesn’t request the content of the whole table, but only one cell.

Example:

var dmaId = 10;
var elementId = 11;
var tableId = 100;
var columnId = 102;
var index = “index”;

var dms = protocol.GetDms();
var element = dms.GetElement(new DmsElementId(dmaId, elementId));
var table = element.GetTable(tableId);
var column = table.GetColumn<double>(columnId);

var value = column.GetValue(index);

Tom Waterbley [SLC] [DevOps Catalyst] Posted new comment 5th December 2022
Martin Vrzba [DevOps Advocate] commented

Hi Tom,

Thanks a lot for your answer. This works, though only partially.

The culprit is, that in the GetValue method I am not able to retrieve a value using a primary key (which is what I need) as the index , instead of a display key from a table that is using a “displayColumn” attribute, while it works for tables using the “naming” option. Retrieving the value from a table with a “displayColumn” using Display Key as the index works well.

I guess this is a known limitation and drivers are encouraged to use the naming feature.

Thanks
Tom Waterbley [SLC] [DevOps Catalyst] commented

Hi Martin,
That’s actually a know bug that will need to be solved. The GetValue method should work with the primary key. Retrieving a cell by primary key works, but when there is a display key with the same value, that one will be taken instead, although the primary key of that row could be different.
(internal task ID 168905)