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17:29, EET
December 13, 2016
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Hello,
Hi all,
I have to get the past(historic) data from the server. my program is running in client java sdk, and my server is prosys. I checked with prosys client to get the historical data from the server its working fine. i used the codes in the client document.
CODE:
1) HistoryReadDetails details = new ReadRawModifiedDetails(false,DateTime.MIN_VALUE, DateTime.currentTime(),UnsignedInteger.MAX_VALUE, true);
HistoryReadValueId nodesToRead = new HistoryReadValueId(new NodeId(5, “square1”), null,QualifiedName.DEFAULT_BINARY_ENCODING, null);
HistoryReadResult[] result = client.historyRead(details,TimestampsToReturn.Both, true, nodesToRead);
System.out.println(result);
2) DataValue[] result = client.historyReadRaw(new NodeId(5, “square1”),DateTime.MIN_VALUE, DateTime.currentTime(),UnsignedInteger.MAX_VALUE, true, null, TimestampsToReturn.Source);
System.out.println(result);
O/P: when i run this i am getting output as following
1) ” [Lorg.opcfoundation.ua.core.HistoryReadResult;@5609159b”
2) [Lorg.opcfoundation.ua.builtintypes.DataValue;@17a7f733
suggest me a right way to do!!
Thanks
17:55, EET
December 21, 2011
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Since the values are arrays, you have to use the standard Java method ‘Arrays.toString(result)’ instead of plain ‘result’ to see the values of the elements.
Or you can loop the array yourself and display each element on a separate line, which will produce a nicer output.
12:55, EET
December 13, 2016
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Hi Jouni,
Thanks for the reply. I did looping concept as you said, i have a question for you.
1) Can we set the time period (start and end) in my client program for accessing the data from the history.
2) or we should specify those condition in simulation server.
Thanks!!
14:26, EET
April 17, 2013
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Hello,
You should specify the time period in the client application when reading history. For example, in your own example you are setting these values to DateTime.MIN_VALUE and DateTime.currentTime().
The Javadoc of UaClient.historyReadXxx convenience methods contains documentation about these parameters.
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