网站建设找客户渠道,咋制作网站,wordpress wechat,putty搭建wordpress风过无痕 原文 arcengine,深入理解游标Cursors#xff0c;实现数据的快速查找#xff0c;插入#xff0c;删除#xff0c;更新 深入理解游标Cursors#xff0c;实现数据的快速查找#xff0c;插入#xff0c;删除#xff0c;更新 1、查找数据Search Cursors //by yl …风过无痕 原文  arcengine,深入理解游标Cursors实现数据的快速查找插入删除更新   深入理解游标Cursors实现数据的快速查找插入删除更新 1、查找数据Search Cursors //by yl landgis126.com yanleigis21cn.com 2008.7.7 IEnvelope envelope new EnvelopeClass(); envelope.PutCoords(508786, 681196, 513033, 684341); ISpatialFilter spatialFilter new SpatialFilterClass(); spatialFilter.Geometry envelope; String shpFld featureClass.ShapeFieldName; spatialFilter.GeometryField shpFld; spatialFilter.SpatialRel esriSpatialRelEnum.esriSpatialRelIntersects; IQueryFilter queryFilter new QueryFilterClass(); queryFilter (IQueryFilter)spatialFilter;IFeatureCursor searchCursor featureClass.Search(queryFilter, true);//只查询true快一些 IFeature feature searchCursor.NextFeature(); int n 0; while (feature ! null){n;feature baseCursor.NextFeature(); }     2、插入数据Insert Cursors—目前数据插入最快的方法    //by yl landgis126.com yanleigis21cn.com 2008.7.7 IFeatureBuffer featureBuffer featureClass.CreateFeatureBuffer(); IFeatureCursor featureCursor featureClass.Insert(true); object featureOID; featureBuffer.set_Value(featureBuffer.Fields.FindField(InstBy), B Pierce);for (int ic 0; ic 99; ic) { featureBuffer.Shape geometryfeatureOID featureCursor.InsertFeature(featureBuffer); }featureBuffer.set_Value(featureBuffer.Fields.FindField(InstBy), K Johnston);for (int ic 0; ic 99; ic) {featureBuffer.Shape geometryfeatureOID featureCursor.InsertFeature(featureBuffer); }featureCursor.Flush();   3、 数据删除 delete    //by yl landgis126.com yanleigis21cn.com 2008.7.7 IFeatureClass featureClass featureWorkspace.OpenFeatureClass(Parcels);IQueryFilter queryFilter new QueryFilterClass(); queryFilter.WhereClause ZONING_S R; IFeatureCursor updateCursor featureClass.Update(queryFilter, false);IFeature feature updateCursor.NextFeature();int m 0; while (feature ! null) {m;updateCursor.DeleteFeature(feature);feature updateCursor.NextFeature(); }     4、数据更新 update      //by yl landgis126.com yanleigis21cn.com 2008.7.7 IFeatureClass featureClass featureWorkspace.OpenFeatureClass(Parcels);// restrict the number of features to be updated. IQueryFilter queryFilter new QueryFilterClass(); queryFilter.WhereClause ZONING_S U;// use IFeatureClass::Update to populate IFeatureCursor IFeatureCursor updateCursor featureClass.Update(queryFilter, false); int fieldindex featureClass.FindField(ZONING_S); IFeature feature updateCursor.NextFeature();int m 0; while (feature ! null) {m;feature.set_Value(fieldindex, X);updateCursor.UpdateFeature(feature);feature updateCursor.NextFeature(); }转载于:https://www.cnblogs.com/arxive/p/6114330.html