MongoDB的3.x版本Java驅動相對2.x做了全新的設計，類庫和使用方法上有很大區別。例如用Document替換BasicDBObject、通過Builders類構建Bson替代直接輸入$命令等，本文整理了基于3.2版本的常用增刪改查操作的使用方法。為了避免冗長的篇幅，分為增刪改、查詢、聚合、地理索引等幾部分。

隨著移動設備的普及，基于坐標和經緯度的位置查詢變得越來越流行，例如查找離當前位置最近的N輛出租車。Mongodb專門針對這種查詢建立了地理空間索引:2d和2dsphere索引。2d用于平面基于坐標的位置計算，2dsphere主要用于球體，比如地球，提供了基于弧度的位置計算。

import static com.mongodb.client.model.Indexes.geo2d; import static com.mongodb.client.model.Indexes.geo2dsphere;import java.text.ParseException; import java.util.ArrayList; import java.util.Arrays; import java.util.List;import org.bson.Document;import com.mongodb.Block; import com.mongodb.MongoClient; import com.mongodb.client.FindIterable; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoDatabase; import com.mongodb.client.model.Filters; import com.mongodb.client.model.geojson.LineString; import com.mongodb.client.model.geojson.Point; import com.mongodb.client.model.geojson.Polygon; import com.mongodb.client.model.geojson.Position;public class GeospatialExamples {public static void main(String[] args) throws ParseException {MongoClient mongoClient = new MongoClient("localhost", 27017);MongoDatabase database = mongoClient.getDatabase("lesson");GeospatialExamples client = new GeospatialExamples(database);client.show();mongoClient.close();}private MongoDatabase database;public GeospatialExamples(MongoDatabase database) {this.database = database;}public void show() {MongoCollection<Document> mc = database.getCollection("people");mc.drop();Document doc1 = new Document("name", "tom").append("raid", Arrays.asList(10, 10)).append("gps", new Point(new Position(10, 10)));Document doc2 = new Document("name", "jone").append("raid", Arrays.asList(10.1, 10)).append("gps", new Point(new Position(10.1, 10)));Document doc3 = new Document("name", "john").append("raid", Arrays.asList(10, 10.1)).append("gps", new Point(new Position(10, 10.1)));Document doc4 = new Document("name", "jack").append("raid", Arrays.asList(9.9, 10)).append("gps", new Point(new Position(9.9, 10)));Document doc5 = new Document("name", "mary").append("raid", Arrays.asList(10, 9.9)).append("gps", new Point(new Position(10, 9.9)));Document doc6 = new Document("name", "abby").append("raid", Arrays.asList(10.2, 10)).append("gps", new Point(new Position(10.2, 10)));Document doc7 = new Document("name", "adam").append("raid", Arrays.asList(10.3, 10)).append("gps", new Point(new Position(10.3, 10)));Document doc8 = new Document("name", "barry").append("raid", Arrays.asList(10.4, 10)).append("gps", new Point(new Position(10.4, 10)));Document doc9 = new Document("name", "anne").append("raid", Arrays.asList(10.5, 10)).append("gps", new Point(new Position(10.5, 10)));mc.insertMany(Arrays.asList(doc1, doc2, doc3, doc4, doc5, doc6, doc7, doc8, doc9));mc.createIndex(geo2d("raid"));mc.createIndex(geo2dsphere("gps"));//$geoWithin 匹配任意幾何圖形內搜索FindIterable<Document> iterable = mc.find(Filters.geoWithin("raid", new Polygon(Arrays.asList(new Position(10.2, 10), new Position(10, 10.2), new Position(9.8, 10), new Position(10, 9.8), new Position(10.2, 10)))));printResult("Filters.geoWithin raid", iterable);//$geoWithinBox 在以左下角和右上角坐標構成方形內搜索iterable = mc.find(Filters.geoWithinBox("raid", 9.8, 9.8, 10.2, 10.2));printResult("Filters.geoWithinBox raid", iterable);//$geoWithinPolygon 在多邊形內搜索List<Double> p1 = new ArrayList<>();List<Double> p2 = new ArrayList<>();List<Double> p3 = new ArrayList<>();p1.add(10d);p1.add(10d);p2.add(10.1);p2.add(10.16);p3.add(10.2);p3.add(10d);List<List<Double>> polygon = Arrays.asList(p1, p2, p3);iterable = mc.find(Filters.geoWithinPolygon("raid", polygon));printResult("Filters.geoWithinPolygon raid", iterable);p2.clear();p2.add(9.9);p2.add(10.16);p3.clear();p3.add(9.8);p3.add(10d);polygon = Arrays.asList(p1, p2, p3);iterable = mc.find(Filters.geoWithinPolygon("gps", polygon));printResult("Filters.geoWithinPolygon gps", iterable);//$geoWithinCenter 在指定圓心和半徑的圓形內搜索iterable = mc.find(Filters.geoWithinCenter("raid", 10d, 10d, 0.25));printResult("Filters.geoWithinCenter raid", iterable);//$geoWithinCenterSphere 在球體(地球)上指定圓心和弧度搜索, 例如搜索以[10,10]為中心500米內的文檔, 參數為...10d, 10d, 0.5/6371iterable = mc.find(Filters.geoWithinCenterSphere("gps", 10d, 10d, 11d/6371));printResult("Filters.geoWithinCenterSphere gps", iterable);//$geoIntersectsiterable = mc.find(Filters.geoIntersects("gps", new LineString(Arrays.asList(new Position(10, 10.1), new Position(10.1, 10), new Position(10, 9.9)))));printResult("Filters.geoIntersects gps", iterable);//$neariterable = mc.find(Filters.near("gps", new Point(new Position(10, 10)), 20566d, 0d));printResult("Filters.near gps", iterable);//$nearSphereiterable = mc.find(Filters.nearSphere("gps", new Point(new Position(10, 10)), 20566d, 10d));printResult("Filters.nearSphere gps", iterable);}public void printResult(String doing, FindIterable<Document> iterable) {System.out.println(doing);iterable.forEach(new Block<Document>() {public void apply(final Document document) {System.out.println(document);}});System.out.println("------------------------------------------------------");System.out.println();} }

轉載于:https://www.cnblogs.com/autfish/p/5557561.html

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