[mapguide-users] MgDateTimeException

[Jackie Ng]

You still could be onto something :-) 

I've been trying to query features via MaestroAPI (http connection) and I
get random errors like the one you mentioned. I have a strong belief that
some part of the MG code base is still calling MgFeatureReader::GetXXX()
without checking for null values first. 

What are you trying to populate into? MgSelection?

- Jackie


Suja Sudhan wrote:
> 
> 
> Yes Jackie, but guess I can check for null values only after populating
> the
> feature reader. But the error is thrown while populating the feature
> reader
> itself.
> 
> 
> 
> Jackie C. Ng wrote:
>> 
>> You could be onto something here. A recent change in the API (?) requires
>> that if you call any MgFeatureReader::GetXXX() method, that you should
>> call IsNull() on that property first, and then call the GetXXX() method
>> if
>> IsNull() returns false. Otherwise an exception will be thrown if the
>> property in question is null.
>> 
>> - Jackie
>> 
>> 
>> Suja Sudhan wrote:
>>> 
>>> Thanks for your response Jackie. 
>>> 
>>> I later found that if a datetime field is null for a feature, then the
>>> error is thrown. Error is not thrown when the field has a valid value
>>> and
>>> the feature reader is populated without any issue. I am using MGE2008.
>>> Guess, null datetime values aren't accepted. Can someone confirm this
>>> please?
>>> 
>>> Thanks again.
>>> Suja
>>> 
>>> 
>>> 
>>> 
>>> Jackie C. Ng wrote:
>>>> 
>>>> 
>>>> It could be a bad filter string, what is the value of selectstring when
>>>> you
>>>> pass it to the MgFeatureQueryOptions object?
>>>> 
>>>> - Jackie
>>>> 
>>>> 
>>>> Suja Sudhan wrote:
>>>>> 
>>>>> 
>>>>> Hello All,
>>>>> 
>>>>> I am trying to get all the attributes of a layer and below is my code
>>>>> to
>>>>> do
>>>>> it. It works well for most of the layers but throws
>>>>> MgDateTimeException
>>>>> for
>>>>> couple of layers at the line of code where the feature reader is
>>>>> populated
>>>>> (pl see code below). What should be causing this, anything to do with
>>>>> the
>>>>> data?
>>>>> 
>>>>>             MgMap map = new MgMap();
>>>>>             map.Open(resService, mapName);
>>>>> 
>>>>>             //get the layer for which the attributes have to be got
>>>>>             MgLayerBase layer = map.GetLayers().GetItem(layerName);
>>>>> 
>>>>>             //get the layer class name
>>>>>             string layerClassName = layer.GetFeatureClassName();
>>>>> 
>>>>>             MgSelection selection = new MgSelection();
>>>>> 
>>>>>             //generate a selection string
>>>>>             string selectstring = selection.GenerateFilter(layer,
>>>>> layerClassName).ToString();
>>>>> 
>>>>>             //set the query option required for the reader to populate
>>>>>             MgFeatureQueryOptions featQueryOption = new
>>>>> MgFeatureQueryOptions();
>>>>>             featQueryOption.SetFilter(selectstring);
>>>>> 
>>>>>             //get the layer resource id
>>>>>             MgResourceIdentifier resId = new
>>>>> MgResourceIdentifier(layer.GetFeatureSourceId()); ;
>>>>>            
>>>>>             //populate feature reader
>>>>>             MgFeatureReader reader = featService.SelectFeatures(resId,
>>>>> layerClassName, featQueryOption);
>>>>> 
>>>>> The code throws MgDateTimeException (message: A date and/or time
>>>>> exception
>>>>> occurred.) at the above line.
>>>>> 
>>>>> Thanks,
>>>>> Suja
>>>>> -- 
>>>>> View this message in context:
>>>>> http://www.nabble.com/MgDateTimeException-tp19465653p19465653.html
>>>>> Sent from the MapGuide Users mailing list archive at Nabble.com.
>>>>> 
>>>>> _______________________________________________
>>>>> mapguide-users mailing list
>>>>> mapguide-users at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>>> 
>>>>> 
>>>> 
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>>>> 
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>>>> 
>>>> -----
>>>> http://themapguyde.blogspot.com
>>>> 
>>>> http://www.linkedin.com/in/jackieng
>>>> 
>>> 
>>> 
>> 
>> 
> 
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> 
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