[gdal-dev] Question about command line options -append

[Even Rouault]

On mardi 28 novembre 2017 15:20:20 CET Victor Chernetsky wrote:
> Hi Even,
> 
> Then in my driver, how do I know if I have to append data to existing
> dataset, 
> or overwrite existing data, or create a new dataset all together?

That should work automagically if you correctly implement the semantics of the 
relevant dataset and layer virtual methods

If the user doesn't specify -append or -overwrite, but just -update, and the layer doesn't exist, 
then ogr2ogr will call GDALDataset::ICreateLayer()

> 
> What about -overwrite option?

If the user specify -overwrite, then ogr2ogr will call GDALDataset::DeleteLayer(), and then 
ICreateLayer()

Looking quickly at the amigocloud driver, everything looks in place already.

Even

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