[Qgis-developer] QgsDataProvider and supportsSubsetString

[Nathan Woodrow]

Chris,

Also not there is previsions to add this kind of thing to QgsFeatureRequest
http://www.qgis.org/api/qgsfeaturerequest_8h_source.html

- Nathan


On Tue, Apr 30, 2013 at 4:33 PM, Chris Crook <ccrook at linz.govt.nz> wrote:

> Hi All
>
> As we are looking at API tidy ups (I understand), would there be any
> support for providing a bit more granularity in supportsSubsetString.  At
> the moment this is a simple boolean, and the GUI offers a SQL based subset
> string builder.
>
> However not all providers naturally use SQL based strings.  I'm interested
> in adding subset capability to the delimited text provider, whichi I've
> done using QgsExpression as the basis for subsets.  This works very well
> except that the GUI isn't an expression builder.  I think there may be
> similar issues with the WFS provider.
>
> What I am proposing is something more like an enum
> QgsDataProvider::SubsetStringType, which could then be interrogated by the
> properties dialog to select the appropriate query builder dialog.
>
> Logically this would supplant the supportsSubsetString boolean which could
> be deprecated, replaced with
>
> virtual QgsDataProvider::SubsetStringType
> QgsDataProvider::subsetStringType(){ return NoSubsetString; }
>
> Other types could be SqlSubsetString, ExpressionSubsetString, ...?
>
> Thoughts anyone?
>
> Thanks
> Chris
>
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