C++ QgsVectorLayer::commitChanges方法代码示例

QgsVectorLayer *QgsAuxiliaryLayer::toSpatialLayer() const
{
  QgsVectorLayer *layer = QgsMemoryProviderUtils::createMemoryLayer( QStringLiteral( "auxiliary_layer" ), fields(), mLayer->wkbType(), mLayer->crs() );

  QString pkField = mJoinInfo.targetFieldName();
  QgsFeature joinFeature;
  QgsFeature targetFeature;
  QgsFeatureIterator it = getFeatures();

  layer->startEditing();
  while ( it.nextFeature( joinFeature ) )
  {
    QString filter = QgsExpression::createFieldEqualityExpression( pkField, joinFeature.attribute( AS_JOINFIELD ) );

    QgsFeatureRequest request;
    request.setFilterExpression( filter );

    mLayer->getFeatures( request ).nextFeature( targetFeature );

    if ( targetFeature.isValid() )
    {
      QgsFeature newFeature( joinFeature );
      newFeature.setGeometry( targetFeature.geometry() );
      layer->addFeature( newFeature );
    }
  }
  layer->commitChanges();

  return layer;
}

//.........这里部分代码省略.........
                QgsField field = fields.at( fieldMapIt.value() );
                if ( field.type() == 2 )
                  layer->changeAttributeValue( *fidIt, fieldMapIt.value(), it.value().toInt( &conversionSuccess ) );
                else if ( field.type() == 6 )
                  layer->changeAttributeValue( *fidIt, fieldMapIt.value(), it.value().toDouble( &conversionSuccess ) );
                else
                  layer->changeAttributeValue( *fidIt, fieldMapIt.value(), it.value() );
              }

              if ( !geometryElem.isNull() )
              {
                QgsGeometry g = QgsOgcUtils::geometryFromGML( geometryElem );
                if ( !layer->changeGeometry( *fidIt, g ) )
                {
                  throw QgsRequestNotWellFormedException( QStringLiteral( "Error in change geometry" ) );
                }
              }

#ifdef HAVE_SERVER_PYTHON_PLUGINS
              fit = layer->getFeatures( QgsFeatureRequest( *fidIt ) );
              while ( fit.nextFeature( feature ) )
              {
                if ( !accessControl->allowToEdit( layer, feature ) )
                {
                  layer->rollBack();
                  throw QgsSecurityAccessException( QStringLiteral( "Feature modify permission denied" ) );
                }
              }
#endif
            }
          }
        }
        // Commit the changes of the update elements
        if ( !layer->commitChanges() )
        {
          addTransactionResult( resp, respElem, QStringLiteral( "PARTIAL" ), QStringLiteral( "Update" ), layer->commitErrors().join( QStringLiteral( "\n  " ) ) );
          return resp;
        }
        // Start the delete transaction
        layer->startEditing();
        if (( cap & QgsVectorDataProvider::DeleteFeatures ) )
        {
          // Loop through the delete elements
          QDomNodeList delNodeList = typeNameElem.elementsByTagNameNS( WFS_NAMESPACE, QStringLiteral( "Delete" ) );
          for ( int j = 0; j < delNodeList.count(); ++j )
          {
            if ( !configParser->wfstDeleteLayers().contains( layer->id() ) )
            {
              //no wfs permissions to do updates
              QString errorMsg = "No permissions to do WFS deletes on layer '" + layer->name() + "'";
              QgsMessageLog::logMessage( errorMsg, QStringLiteral( "Server" ), QgsMessageLog::CRITICAL );
              addTransactionResult( resp, respElem, QStringLiteral( "FAILED" ), QStringLiteral( "Delete" ), errorMsg );
              return resp;
            }

            actionElem = delNodeList.at( j ).toElement();
            QDomElement filterElem = actionElem.firstChild().toElement();
            // Get Feature Ids for the Filter element
            QgsFeatureIds fids = getFeatureIdsFromFilter( filterElem, layer );

#ifdef HAVE_SERVER_PYTHON_PLUGINS
            QgsFeatureIds::const_iterator fidIt = fids.constBegin();
            for ( ; fidIt != fids.constEnd(); ++fidIt )
            {
              QgsFeatureIterator fit = layer->getFeatures( QgsFeatureRequest( *fidIt ) );
              QgsFeature feature;

//.........这里部分代码省略.........
    // add new layer
    QgsVectorLayer* newLayer = new QgsVectorLayer( QString( "dbname='%1' table='%2'(Geometry) sql=" )
        .arg( offlineDbPath ).arg( tableName ), tableName + " (offline)", "spatialite" );
    if ( newLayer->isValid() )
    {
      // mark as offline layer
      newLayer->setCustomProperty( CUSTOM_PROPERTY_IS_OFFLINE_EDITABLE, true );

      // store original layer source
      newLayer->setCustomProperty( CUSTOM_PROPERTY_REMOTE_SOURCE, layer->source() );
      newLayer->setCustomProperty( CUSTOM_PROPERTY_REMOTE_PROVIDER, layer->providerType() );

      // copy style
      bool hasLabels = layer->hasLabelsEnabled();
      if ( !hasLabels )
      {
        // NOTE: copy symbology before adding the layer so it is displayed correctly
        copySymbology( layer, newLayer );
      }

      // register this layer with the central layers registry
      QgsMapLayerRegistry::instance()->addMapLayers(
        QList<QgsMapLayer *>() << newLayer );

      if ( hasLabels )
      {
        // NOTE: copy symbology of layers with labels enabled after adding to project, as it will crash otherwise (WORKAROUND)
        copySymbology( layer, newLayer );
      }

      // TODO: layer order

      // copy features
      newLayer->startEditing();
      QgsFeature f;

      // NOTE: force feature recount for PostGIS layer, else only visible features are counted, before iterating over all features (WORKAROUND)
      layer->setSubsetString( "" );

      QgsFeatureIterator fit = layer->getFeatures();

      emit progressModeSet( QgsOfflineEditing::CopyFeatures, layer->featureCount() );
      int featureCount = 1;

      QList<QgsFeatureId> remoteFeatureIds;
      while ( fit.nextFeature( f ) )
      {
        remoteFeatureIds << f.id();

        // NOTE: Spatialite provider ignores position of geometry column
        // fill gap in QgsAttributeMap if geometry column is not last (WORKAROUND)
        int column = 0;
        QgsAttributes attrs = f.attributes();
        QgsAttributes newAttrs( attrs.count() );
        for ( int it = 0; it < attrs.count(); ++it )
        {
          newAttrs[column++] = attrs[it];
        }
        f.setAttributes( newAttrs );

        newLayer->addFeature( f, false );

        emit progressUpdated( featureCount++ );
      }
      if ( newLayer->commitChanges() )
      {
        emit progressModeSet( QgsOfflineEditing::ProcessFeatures, layer->featureCount() );
        featureCount = 1;

        // update feature id lookup
        int layerId = getOrCreateLayerId( db, newLayer->id() );
        QList<QgsFeatureId> offlineFeatureIds;

        QgsFeatureIterator fit = newLayer->getFeatures( QgsFeatureRequest().setFlags( QgsFeatureRequest::NoGeometry ).setSubsetOfAttributes( QgsAttributeList() ) );
        while ( fit.nextFeature( f ) )
        {
          offlineFeatureIds << f.id();
        }

        // NOTE: insert fids in this loop, as the db is locked during newLayer->nextFeature()
        sqlExec( db, "BEGIN" );
        int remoteCount = remoteFeatureIds.size();
        for ( int i = 0; i < remoteCount; i++ )
        {
          addFidLookup( db, layerId, offlineFeatureIds.at( i ), remoteFeatureIds.at( remoteCount - ( i + 1 ) ) );
          emit progressUpdated( featureCount++ );
        }
        sqlExec( db, "COMMIT" );
      }
      else
      {
        showWarning( newLayer->commitErrors().join( "\n" ) );
      }

      // remove remote layer
      QgsMapLayerRegistry::instance()->removeMapLayers(
        QStringList() << layer->id() );
    }
  }
}

void QgsOfflineEditing::synchronize()
{
  // open logging db
  sqlite3* db = openLoggingDb();
  if ( db == NULL )
  {
    return;
  }

  emit progressStarted();

  // restore and sync remote layers
  QList<QgsMapLayer*> offlineLayers;
  QMap<QString, QgsMapLayer*> mapLayers = QgsMapLayerRegistry::instance()->mapLayers();
  for ( QMap<QString, QgsMapLayer*>::iterator layer_it = mapLayers.begin() ; layer_it != mapLayers.end(); ++layer_it )
  {
    QgsMapLayer* layer = layer_it.value();
    if ( layer->customProperty( CUSTOM_PROPERTY_IS_OFFLINE_EDITABLE, false ).toBool() )
    {
      offlineLayers << layer;
    }
  }

  for ( int l = 0; l < offlineLayers.count(); l++ )
  {
    QgsMapLayer* layer = offlineLayers[l];

    emit layerProgressUpdated( l + 1, offlineLayers.count() );

    QString remoteSource = layer->customProperty( CUSTOM_PROPERTY_REMOTE_SOURCE, "" ).toString();
    QString remoteProvider = layer->customProperty( CUSTOM_PROPERTY_REMOTE_PROVIDER, "" ).toString();
    QString remoteName = layer->name();
    remoteName.remove( QRegExp( " \\(offline\\)$" ) );

    QgsVectorLayer* remoteLayer = new QgsVectorLayer( remoteSource, remoteName, remoteProvider );
    if ( remoteLayer->isValid() )
    {
      // TODO: only add remote layer if there are log entries?

      QgsVectorLayer* offlineLayer = qobject_cast<QgsVectorLayer*>( layer );

      // copy style
      copySymbology( offlineLayer, remoteLayer );

      // register this layer with the central layers registry
      QgsMapLayerRegistry::instance()->addMapLayers(
        QList<QgsMapLayer *>() << remoteLayer, true );

      // apply layer edit log
      QString qgisLayerId = layer->id();
      QString sql = QString( "SELECT \"id\" FROM 'log_layer_ids' WHERE \"qgis_id\" = '%1'" ).arg( qgisLayerId );
      int layerId = sqlQueryInt( db, sql, -1 );
      if ( layerId != -1 )
      {
        remoteLayer->startEditing();

        // TODO: only get commitNos of this layer?
        int commitNo = getCommitNo( db );
        for ( int i = 0; i < commitNo; i++ )
        {
          // apply commits chronologically
          applyAttributesAdded( remoteLayer, db, layerId, i );
          applyAttributeValueChanges( offlineLayer, remoteLayer, db, layerId, i );
          applyGeometryChanges( remoteLayer, db, layerId, i );
        }

        applyFeaturesAdded( offlineLayer, remoteLayer, db, layerId );
        applyFeaturesRemoved( remoteLayer, db, layerId );

        if ( remoteLayer->commitChanges() )
        {
          // update fid lookup
          updateFidLookup( remoteLayer, db, layerId );

          // clear edit log for this layer
          sql = QString( "DELETE FROM 'log_added_attrs' WHERE \"layer_id\" = %1" ).arg( layerId );
          sqlExec( db, sql );
          sql = QString( "DELETE FROM 'log_added_features' WHERE \"layer_id\" = %1" ).arg( layerId );
          sqlExec( db, sql );
          sql = QString( "DELETE FROM 'log_removed_features' WHERE \"layer_id\" = %1" ).arg( layerId );
          sqlExec( db, sql );
          sql = QString( "DELETE FROM 'log_feature_updates' WHERE \"layer_id\" = %1" ).arg( layerId );
          sqlExec( db, sql );
          sql = QString( "DELETE FROM 'log_geometry_updates' WHERE \"layer_id\" = %1" ).arg( layerId );
          sqlExec( db, sql );

          // reset commitNo
          QString sql = QString( "UPDATE 'log_indices' SET 'last_index' = 0 WHERE \"name\" = 'commit_no'" );
          sqlExec( db, sql );
        }
        else
        {
          showWarning( remoteLayer->commitErrors().join( "\n" ) );
        }
      }

      // remove offline layer
      QgsMapLayerRegistry::instance()->removeMapLayers(
        ( QStringList() << qgisLayerId ) );

//.........这里部分代码省略.........