HugeGraph-Client Quick Start

1 HugeGraph-Client 概述

HugeGraph-Client 向 HugeGraph-Server 发出 HTTP 请求，获取并解析 Server 的执行结果。目前仅提供了 Java 版，用户可以使用 HugeGraph-Client 编写 Java 代码操作 HugeGraph，比如元数据和图数据的增删改查，或者执行 gremlin 语句。

2 环境要求

  • java 11 (兼容 java 8)
  • maven 3.5+

3 使用流程

使用 HugeGraph-Client 的基本步骤如下：

  • 新建Eclipse/ IDEA Maven 项目；
  • 在 pom 文件中添加 HugeGraph-Client 依赖；
  • 创建类，调用 HugeGraph-Client 接口；

详细使用过程见下节完整示例。

4 完整示例

4.1 新建 Maven 工程

可以选择 Eclipse 或者 Intellij Idea 创建工程：

4.2 添加 hugegraph-client 依赖

添加 hugegraph-client 依赖

  2. <dependencies>
  3.     <dependency>
  4.         <groupId>org.apache.hugegraph</groupId>
  5.         <artifactId>hugegraph-client</artifactId>
  6.         <version>${version}</version>
  7.     </dependency>
  8. </dependencies>

4.3 Example

4.3.1 SingleExample
  1. import java.io.IOException;
  2. import java.util.Iterator;
  3. import java.util.List;
  5. import org.apache.hugegraph.driver.GraphManager;
  6. import org.apache.hugegraph.driver.GremlinManager;
  7. import org.apache.hugegraph.driver.HugeClient;
  8. import org.apache.hugegraph.driver.SchemaManager;
  9. import org.apache.hugegraph.structure.constant.T;
  10. import org.apache.hugegraph.structure.graph.Edge;
  11. import org.apache.hugegraph.structure.graph.Path;
  12. import org.apache.hugegraph.structure.graph.Vertex;
  13. import org.apache.hugegraph.structure.gremlin.Result;
  14. import org.apache.hugegraph.structure.gremlin.ResultSet;
  16. public class SingleExample {
  18.     public static void main(String[] args) throws IOException {
  19.         // If connect failed will throw a exception.
  20.         HugeClient hugeClient = HugeClient.builder("http://localhost:8080",
  21.                                                    "hugegraph")
  22.                                           .build();
  24.         SchemaManager schema = hugeClient.schema();
  26.         schema.propertyKey("name").asText().ifNotExist().create();
  27.         schema.propertyKey("age").asInt().ifNotExist().create();
  28.         schema.propertyKey("city").asText().ifNotExist().create();
  29.         schema.propertyKey("weight").asDouble().ifNotExist().create();
  30.         schema.propertyKey("lang").asText().ifNotExist().create();
  31.         schema.propertyKey("date").asDate().ifNotExist().create();
  32.         schema.propertyKey("price").asInt().ifNotExist().create();
  34.         schema.vertexLabel("person")
  35.               .properties("name", "age", "city")
  36.               .primaryKeys("name")
  37.               .ifNotExist()
  38.               .create();
  40.         schema.vertexLabel("software")
  41.               .properties("name", "lang", "price")
  42.               .primaryKeys("name")
  43.               .ifNotExist()
  44.               .create();
  46.         schema.indexLabel("personByCity")
  47.               .onV("person")
  48.               .by("city")
  49.               .secondary()
  50.               .ifNotExist()
  51.               .create();
  53.         schema.indexLabel("personByAgeAndCity")
  54.               .onV("person")
  55.               .by("age", "city")
  56.               .secondary()
  57.               .ifNotExist()
  58.               .create();
  60.         schema.indexLabel("softwareByPrice")
  61.               .onV("software")
  62.               .by("price")
  63.               .range()
  64.               .ifNotExist()
  65.               .create();
  67.         schema.edgeLabel("knows")
  68.               .sourceLabel("person")
  69.               .targetLabel("person")
  70.               .properties("date", "weight")
  71.               .ifNotExist()
  72.               .create();
  74.         schema.edgeLabel("created")
  75.               .sourceLabel("person").targetLabel("software")
  76.               .properties("date", "weight")
  77.               .ifNotExist()
  78.               .create();
  80.         schema.indexLabel("createdByDate")
  81.               .onE("created")
  82.               .by("date")
  83.               .secondary()
  84.               .ifNotExist()
  85.               .create();
  87.         schema.indexLabel("createdByWeight")
  88.               .onE("created")
  89.               .by("weight")
  90.               .range()
  91.               .ifNotExist()
  92.               .create();
  94.         schema.indexLabel("knowsByWeight")
  95.               .onE("knows")
  96.               .by("weight")
  97.               .range()
  98.               .ifNotExist()
  99.               .create();
  101.         GraphManager graph = hugeClient.graph();
  102.         Vertex marko = graph.addVertex(T.LABEL, "person", "name", "marko",
  103.                                        "age", 29, "city", "Beijing");
  104.         Vertex vadas = graph.addVertex(T.LABEL, "person", "name", "vadas",
  105.                                        "age", 27, "city", "Hongkong");
  106.         Vertex lop = graph.addVertex(T.LABEL, "software", "name", "lop",
  107.                                      "lang", "java", "price", 328);
  108.         Vertex josh = graph.addVertex(T.LABEL, "person", "name", "josh",
  109.                                       "age", 32, "city", "Beijing");
  110.         Vertex ripple = graph.addVertex(T.LABEL, "software", "name", "ripple",
  111.                                         "lang", "java", "price", 199);
  112.         Vertex peter = graph.addVertex(T.LABEL, "person", "name", "peter",
  113.                                        "age", 35, "city", "Shanghai");
  115.         marko.addEdge("knows", vadas, "date", "2016-01-10", "weight", 0.5);
  116.         marko.addEdge("knows", josh, "date", "2013-02-20", "weight", 1.0);
  117.         marko.addEdge("created", lop, "date", "2017-12-10", "weight", 0.4);
  118.         josh.addEdge("created", lop, "date", "2009-11-11", "weight", 0.4);
  119.         josh.addEdge("created", ripple, "date", "2017-12-10", "weight", 1.0);
  120.         peter.addEdge("created", lop, "date", "2017-03-24", "weight", 0.2);
  122.         GremlinManager gremlin = hugeClient.gremlin();
  123.         System.out.println("==== Path ====");
  124.         ResultSet resultSet = gremlin.gremlin("g.V().outE().path()").execute();
  125.         Iterator<Result> results = resultSet.iterator();
  126.         results.forEachRemaining(result -> {
  127.             System.out.println(result.getObject().getClass());
  128.             Object object = result.getObject();
  129.             if (object instanceof Vertex) {
  130.                 System.out.println(((Vertex) object).id());
  131.             } else if (object instanceof Edge) {
  132.                 System.out.println(((Edge) object).id());
  133.             } else if (object instanceof Path) {
  134.                 List<Object> elements = ((Path) object).objects();
  135.                 elements.forEach(element -> {
  136.                     System.out.println(element.getClass());
  137.                     System.out.println(element);
  138.                 });
  139.             } else {
  140.                 System.out.println(object);
  141.             }
  142.         });
  144.         hugeClient.close();
  145.     }
  146. }
4.3.2 BatchExample
  1. import java.util.ArrayList;
  2. import java.util.List;
  4. import org.apache.hugegraph.driver.GraphManager;
  5. import org.apache.hugegraph.driver.HugeClient;
  6. import org.apache.hugegraph.driver.SchemaManager;
  7. import org.apache.hugegraph.structure.graph.Edge;
  8. import org.apache.hugegraph.structure.graph.Vertex;
  10. public class BatchExample {
  12.     public static void main(String[] args) {
  13.         // If connect failed will throw a exception.
  14.         HugeClient hugeClient = HugeClient.builder("http://localhost:8080",
  15.                                                    "hugegraph")
  16.                                           .build();
  18.         SchemaManager schema = hugeClient.schema();
  20.         schema.propertyKey("name").asText().ifNotExist().create();
  21.         schema.propertyKey("age").asInt().ifNotExist().create();
  22.         schema.propertyKey("lang").asText().ifNotExist().create();
  23.         schema.propertyKey("date").asDate().ifNotExist().create();
  24.         schema.propertyKey("price").asInt().ifNotExist().create();
  26.         schema.vertexLabel("person")
  27.               .properties("name", "age")
  28.               .primaryKeys("name")
  29.               .ifNotExist()
  30.               .create();
  32.         schema.vertexLabel("person")
  33.               .properties("price")
  34.               .nullableKeys("price")
  35.               .append();
  37.         schema.vertexLabel("software")
  38.               .properties("name", "lang", "price")
  39.               .primaryKeys("name")
  40.               .ifNotExist()
  41.               .create();
  43.         schema.indexLabel("softwareByPrice")
  44.               .onV("software").by("price")
  45.               .range()
  46.               .ifNotExist()
  47.               .create();
  49.         schema.edgeLabel("knows")
  50.               .link("person", "person")
  51.               .properties("date")
  52.               .ifNotExist()
  53.               .create();
  55.         schema.edgeLabel("created")
  56.               .link("person", "software")
  57.               .properties("date")
  58.               .ifNotExist()
  59.               .create();
  61.         schema.indexLabel("createdByDate")
  62.               .onE("created").by("date")
  63.               .secondary()
  64.               .ifNotExist()
  65.               .create();
  67.         // get schema object by name
  68.         System.out.println(schema.getPropertyKey("name"));
  69.         System.out.println(schema.getVertexLabel("person"));
  70.         System.out.println(schema.getEdgeLabel("knows"));
  71.         System.out.println(schema.getIndexLabel("createdByDate"));
  73.         // list all schema objects
  74.         System.out.println(schema.getPropertyKeys());
  75.         System.out.println(schema.getVertexLabels());
  76.         System.out.println(schema.getEdgeLabels());
  77.         System.out.println(schema.getIndexLabels());
  79.         GraphManager graph = hugeClient.graph();
  81.         Vertex marko = new Vertex("person").property("name", "marko")
  82.                                            .property("age", 29);
  83.         Vertex vadas = new Vertex("person").property("name", "vadas")
  84.                                            .property("age", 27);
  85.         Vertex lop = new Vertex("software").property("name", "lop")
  86.                                            .property("lang", "java")
  87.                                            .property("price", 328);
  88.         Vertex josh = new Vertex("person").property("name", "josh")
  89.                                           .property("age", 32);
  90.         Vertex ripple = new Vertex("software").property("name", "ripple")
  91.                                               .property("lang", "java")
  92.                                               .property("price", 199);
  93.         Vertex peter = new Vertex("person").property("name", "peter")
  94.                                            .property("age", 35);
  96.         Edge markoKnowsVadas = new Edge("knows").source(marko).target(vadas)
  97.                                                 .property("date", "2016-01-10");
  98.         Edge markoKnowsJosh = new Edge("knows").source(marko).target(josh)
  99.                                                .property("date", "2013-02-20");
  100.         Edge markoCreateLop = new Edge("created").source(marko).target(lop)
  101.                                                  .property("date",
  102.                                                            "2017-12-10");
  103.         Edge joshCreateRipple = new Edge("created").source(josh).target(ripple)
  104.                                                    .property("date",
  105.                                                              "2017-12-10");
  106.         Edge joshCreateLop = new Edge("created").source(josh).target(lop)
  107.                                                 .property("date", "2009-11-11");
  108.         Edge peterCreateLop = new Edge("created").source(peter).target(lop)
  109.                                                  .property("date",
  110.                                                            "2017-03-24");
  112.         List<Vertex> vertices = new ArrayList<>();
  113.         vertices.add(marko);
  114.         vertices.add(vadas);
  115.         vertices.add(lop);
  116.         vertices.add(josh);
  117.         vertices.add(ripple);
  118.         vertices.add(peter);
  120.         List<Edge> edges = new ArrayList<>();
  121.         edges.add(markoKnowsVadas);
  122.         edges.add(markoKnowsJosh);
  123.         edges.add(markoCreateLop);
  124.         edges.add(joshCreateRipple);
  125.         edges.add(joshCreateLop);
  126.         edges.add(peterCreateLop);
  128.         vertices = graph.addVertices(vertices);
  129.         vertices.forEach(vertex -> System.out.println(vertex));
  131.         edges = graph.addEdges(edges, false);
  132.         edges.forEach(edge -> System.out.println(edge));
  134.         hugeClient.close();
  135.     }
  136. }

4.4 运行 Example

运行 Example 之前需要启动 Server, 启动过程见HugeGraph-Server Quick Start

4.5 Example 示例说明

示例说明见HugeGraph-Client 基本 API 介绍

Last modified October 9, 2023: doc: enhance a string of problems to improve UE (#288) (69c20091)