We're using GDAL v2.1.2 on Windows. We use the GDAL library with MapWinGIS to connect to a PostGIS database. When the PostGIS table has NULL values in integer, numeric or double fields and that data is read the returned values are 0 (zero), which is unexpected by us.
We use Feature->GetFieldAsDouble() and Feature->GetFieldAsInteger(). Am I correct that these function return 0 when the database value is NULL? If not our implementation is wrong and I need to continue my search. The documentation http://www.gdal.org/classOGRFeature.html#ab8a57c94e8bb8ffac5e7048d896254b4 doesn't say either way. Thanks, Paul
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