[mapguide-users] Services API: 'SelectFeatures' can't accept null properties?

Jackie C. Ng jumpinjackie at gmail.com
Sun Oct 19 16:06:03 EDT 2008

I believe it is because the MgFeatureReader now throws exceptions when
accessing null values and that the http handler hasn't been updated to check
for nulls first.

I've already made a ticket for this issue here:


- Jackie

Carl wrote:
> I tried Services API 'SelectFeatures' of 'Feature' on
> http://localhost/MapGuide/mapagent/index.html.
> fill the Resource id with a MS SQL Server 2008 feature source
>     the Class name with a table name
> and left other field as default.
> the return is as follows:
> Value for Prj_SpatialData property is null.
> Value for Prj_SpatialData property is null. Exception occurred in method
> MgNullableProperty.CheckNull at line 73 in file
> d:\buildforgeprojects\mapguide_open_source_v2.0\build_23.8\mgdev\common\foundation\Data/NullableProperty.cpp
> Prj_SpatialData is of nullable varchar(MAX) field.
> When I manually update Prj_SpatialData='', OK, no error messages shown.
> I tried several tables. Once one table contains a row with null field
> value, the above message will be shown.
> It seems SelectFeatures can't accept the null field value. If so, is it a
> bug?


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