OGR
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OGRFeatureQuery Class Reference

Public Member Functions

char ** GetUsedFields ()
 

Member Function Documentation

char ** OGRFeatureQuery::GetUsedFields ( )

Returns lists of fields in expression.

All attribute fields are used in the expression of this feature query are returned as a StringList of field names. This function would primarily be used within drivers to recognise special case conditions depending only on attribute fields that can be very efficiently fetched.

NOTE: If any fields in the expression are from tables other than the primary table then NULL is returned indicating an error. In succesful use, no non-empty expression should return an empty list.

Returns
list of field names. Free list with CSLDestroy() when no longer required.

The documentation for this class was generated from the following files:

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