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This adds the possibility to manage data on a normalized relational database in N:M relations. On the relation editor in a form, the tools to add, delete, link and unlink work (also) on the linking table if a relation is visualized as N:M relation. Configuration is done through the fields tab where on the relation a second relation can be chosen (if there is a suitable relation in terms of a second relation on the linking table). Limitations =========== QGIS is not a database management system. It is based on assumptions about the underlying database system. In particular it expects * A `ON DELETE CASCADE` or similar measure on the second relation * Does not take care of setting the primary key when adding features. Either users need to be instructed to set them manually or - if it's a database derived value - the layers need to be in transaction mode (currently only activatable through the API)
34 lines
1.3 KiB
Plaintext
34 lines
1.3 KiB
Plaintext
/***************************************************************************
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qgsrelationwidgetwrapper.h
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--------------------------------------
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Date : 14.5.2014
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Copyright : (C) 2014 Matthias Kuhn
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Email : matthias at opengis dot ch
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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class QgsRelationWidgetWrapper : QgsWidgetWrapper
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{
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%TypeHeaderCode
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#include <qgsrelationwidgetwrapper.h>
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%End
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public:
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explicit QgsRelationWidgetWrapper( QgsVectorLayer* vl, const QgsRelation& relation, QWidget* editor = 0, QWidget* parent /TransferThis/ = 0 );
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protected:
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QWidget* createWidget( QWidget* parent );
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void initWidget( QWidget* editor );
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bool valid() const;
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public slots:
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void setFeature( const QgsFeature& feature );
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};
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