C++ iterator::attributes方法代码示例

bool QgsWFSProvider::addFeatures( QgsFeatureList &flist )
{
  //create <Transaction> xml
  QDomDocument transactionDoc;
  QDomElement transactionElem = createTransactionElement( transactionDoc );
  transactionDoc.appendChild( transactionElem );

  //find out typename from uri and strip namespace prefix
  QString tname = mShared->mURI.typeName();
  if ( tname.isNull() )
  {
    return false;
  }
  removeNamespacePrefix( tname );

  //Add the features
  QgsFeatureList::iterator featureIt = flist.begin();
  for ( ; featureIt != flist.end(); ++featureIt )
  {
    //Insert element
    QDomElement insertElem = transactionDoc.createElementNS( QgsWFSConstants::WFS_NAMESPACE, "Insert" );
    transactionElem.appendChild( insertElem );

    QDomElement featureElem = transactionDoc.createElementNS( mApplicationNamespace, tname );

    QgsAttributes featureAttributes = featureIt->attributes();
    int nAttrs = featureAttributes.size();
    for ( int i = 0; i < nAttrs; ++i )
    {
      const QVariant& value = featureAttributes.at( i );
      if ( value.isValid() && !value.isNull() )
      {
        QDomElement fieldElem = transactionDoc.createElementNS( mApplicationNamespace, mShared->mFields.at( i ).name() );
        QDomText fieldText = transactionDoc.createTextNode( value.toString() );
        fieldElem.appendChild( fieldText );
        featureElem.appendChild( fieldElem );
      }
    }

    //add geometry column (as gml)
    const QgsGeometry* geometry = featureIt->constGeometry();
    if ( geometry != nullptr )
    {
      QDomElement geomElem = transactionDoc.createElementNS( mApplicationNamespace, mShared->mGeometryAttribute );
      QgsGeometry the_geom( *geometry );
      // convert to multi if the layer geom type is multi and the geom is not
      if ( QGis::isMultiType( this->geometryType( ) ) && ! the_geom.isMultipart( ) )
      {
        the_geom.convertToMultiType();
      }
      QDomElement gmlElem = QgsOgcUtils::geometryToGML( &the_geom, transactionDoc );
      if ( !gmlElem.isNull() )
      {
        gmlElem.setAttribute( "srsName", crs().authid() );
        geomElem.appendChild( gmlElem );
        featureElem.appendChild( geomElem );
      }
    }

    insertElem.appendChild( featureElem );
  }

  QDomDocument serverResponse;
  bool success = sendTransactionDocument( transactionDoc, serverResponse );
  if ( !success )
  {
    return false;
  }

  if ( transactionSuccess( serverResponse ) )
  {
    //transaction successful. Add the features to the cache
    QStringList idList = insertedFeatureIds( serverResponse );
    QStringList::const_iterator idIt = idList.constBegin();
    featureIt = flist.begin();

    QVector<QgsWFSFeatureGmlIdPair> serializedFeatureList;
    for ( ; idIt != idList.constEnd() && featureIt != flist.end(); ++idIt, ++featureIt )
    {
      serializedFeatureList.push_back( QgsWFSFeatureGmlIdPair( *featureIt, *idIt ) );
    }
    mShared->serializeFeatures( serializedFeatureList );

    // And now set the feature id from the one got from the database
    QMap< QString, QgsFeatureId > map;
    for ( int idx = 0; idx < serializedFeatureList.size(); idx++ )
      map[ serializedFeatureList[idx].second ] = serializedFeatureList[idx].first.id();

    idIt = idList.constBegin();
    featureIt = flist.begin();
    for ( ; idIt != idList.constEnd() && featureIt != flist.end(); ++idIt, ++featureIt )
    {
      if ( map.find( *idIt ) != map.end() )
        featureIt->setFeatureId( map[*idIt] );
    }

    return true;
  }
  else
  {
//.........这里部分代码省略.........

bool QgsDb2Provider::addFeatures( QgsFeatureList & flist )
{
  QgsDebugMsg( "mGeometryColType: " + mGeometryColType );
  int writeCount = 0;
  bool copyOperation = false;

  if ( !mDatabase.isOpen() )
  {
    QString errMsg;
    mDatabase = getDatabase( mConnInfo, errMsg );
    if ( !errMsg.isEmpty() )
    {
      QgsDebugMsg( "getDatabase failed: " + errMsg );
      return false;
    }
  }
  if ( !mDatabase.transaction() )
  {
    QgsDebugMsg( "transaction failed" );
    return false;
  }
  QSqlQuery query = QSqlQuery( mDatabase );
  query.setForwardOnly( true );
  QSqlQuery queryFid = QSqlQuery( mDatabase );
  queryFid.setForwardOnly( true );

  QgsFeature it = flist.at( 0 );
  QString statement;
  QString values;
  statement = QString( "INSERT INTO %1.%2 (" ).arg( mSchemaName, mTableName );

  bool first = true;

// Get the first geometry and its wkbType as when we are doing drag/drop,
// the wkbType is not passed to the DB2 provider from QgsVectorLayerImport
// Can't figure out how to resolved "unreferenced" wkbType compile message
// Don't really do anything with it at this point
#if 0
  QgsGeometry *geom = it.geometry();
  QgsWkbTypes::Type wkbType = geom->wkbType();
  QgsDebugMsg( QString( "wkbType: %1" ).arg( wkbType ) );
  QgsDebugMsg( QString( "mWkbType: %1" ).arg( mWkbType ) );
#endif

  QgsAttributes attrs = it.attributes();
  QgsDebugMsg( QString( "attrs.count: %1" ).arg( attrs.count() ) );
  QgsDebugMsg( QString( "fields.count: %1" ).arg( mAttributeFields.count() ) );
  if ( mAttributeFields.count() == ( attrs.count() + 1 ) )
  {
    copyOperation = true; // FID is first field but no attribute in attrs
  }
  else if ( mAttributeFields.count() !=  attrs.count() )
  {
    QgsDebugMsg( "Count mismatch - failing" );
    return false;
  }


  if ( attrs.count() != mAttributeFields.count() )
  {
    QgsDebugMsg( "field counts don't match" );
//  return false;
  }

  for ( int i = 0; i < mAttributeFields.count(); ++i )
  {
    QgsField fld = mAttributeFields.at( i );
    QgsDebugMsg( QString( "i: %1; got field: %2" ).arg( i ).arg( fld.name() ) );

    if ( fld.name().isEmpty() )
      continue; // invalid

    if ( mFidColName == fld.name() )
      continue; // skip identity field

//      if ( mDefaultValues.contains( i ) && mDefaultValues[i] == attrs.at( i ) )
//        continue; // skip fields having default values

    if ( !first )
    {
      statement += ',';
      values += ',';
    }
    else
      first = false;

    statement += QString( "%1" ).arg( fld.name() );
    values += QString( "?" );
  }

  // append geometry column name
  if ( !mGeometryColName.isEmpty() )
  {
    if ( !first )
    {
      statement += ',';
      values += ',';
    }

    statement += QString( "%1" ).arg( mGeometryColName );
//.........这里部分代码省略.........