[gdal-dev] Update ShapeLayer

[wow]

Hi,
  To update shape files. i got two questions: 
 1. How could i delete a field from a shapelayer?
 2. How to set a value to a specified field of all records? Could i use SQL sentences like "set field_name='value'" on the datasource of shapelayer? 
 Thank you.
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  To the world you're little, but to a person you're the world.
                                             Chen Xuexia
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