orientdb教程（4）-Tinkerpop-gremlin-java简单应用

Dear 丶 2022-11-21 03:38 174阅读 0赞

参考:https://github.com/orientechnologies/orientdb-gremlin/tree/3.0.x/server/src/test/java/com/orientechnologies/tinkerpop  
orientdb会基于gremlin框架风格进行功能扩展开发，但是这并不能用在移植上，所以一般应该会有使用纯gremlin开发和orintdb-gremlin两种。  
**一.构建图**  
**使用orientdb-gremlin**

import org.apache.tinkerpop.gremlin.orientdb.OrientGraph;
    import org.apache.tinkerpop.gremlin.structure.T;
    import org.apache.tinkerpop.gremlin.structure.Vertex;
    
    
    public class TP3Test 
    { 
    	public static void main(String[] args) 
    	{ 
    	    OrientGraph graph = OrientGraph.open("remote:192.168.1.32/test","root","xxx");
    	    graph.createVertexClass("Person");
    	    graph.createVertexClass("Animal");
    	    graph.createEdgeClass("HasFriend");
    	    graph.createEdgeClass("HasAnimal");
    
    	    Vertex v1 = graph.addVertex(T.label, "Person", "name", "Jon");
    	    Vertex v2 = graph.addVertex(T.label, "Person", "name", "Frank");
    
    	    v1.addEdge("HasFriend", v2);
    
    	    Vertex v3 = graph.addVertex(T.label, "Animal", "name", "Foo");
    	    Vertex v4 = graph.addVertex(T.label, "Animal", "name", "Bar");
    
    	    v1.addEdge("HasAnimal", v3, "marker", 10);
    	    v2.addEdge("HasAnimal", v4);
    	}
    }

**使用纯gremlin**  
gremlin是不会有创建createVertexClass这样的方法提供的，因为底层的数据库可以随意切换，在orientdb中叫class,但在其它数据库中就未必了，所以构建图只会增加节点Vertex,边Edge，所以需要事先创建好class。

import org.apache.tinkerpop.gremlin.orientdb.OrientGraph;
    import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
    import org.apache.tinkerpop.gremlin.structure.Vertex;
    
    
    public class TP3Test2 
    { 
    	public static void main(String[] args) 
    	{ 
    		OrientGraph graph = OrientGraph.open("remote:192.168.1.32/test","root","xxx");
    		//遍历对象
    		GraphTraversalSource gts = graph.traversal();
    		//构建图
    		Vertex v1 = gts.addV("person").property("name", "marko").property("age", 29).next();
    		Vertex v2 = gts.addV("software").property("name", "lop").property("lang", "java").next();
    		gts.addE("created").from(v1).to(v2).property("weight", 0.4);
    	}
    }

**二.遍历图**

**使用纯gremlin**

import java.util.List;
    
    import org.apache.tinkerpop.gremlin.orientdb.OrientGraphFactory;
    import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
    import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
    import org.apache.tinkerpop.gremlin.structure.Graph;
    import org.apache.tinkerpop.gremlin.structure.Vertex;
    
    
    public class TP3Test4 
    { 
    	public static void main(String[] args) 
    	{ 
    		//创建图工厂
    		OrientGraphFactory factory = new OrientGraphFactory("remote:192.168.1.32/test","root","xxx");
    		//返回非事务图
    		Graph graph = factory.getNoTx();
    		//遍历对象
    		GraphTraversalSource g = graph.traversal();
    		try
    		{ 
    			//outE拿到边
    // GraphTraversal<Vertex, Edge> gt = g.V().has("name","marko").outE("created");
    			//拿到顶点
    // GraphTraversal<Vertex, Edge> gt = g.V().has("name","marko").outE("created").inV();
    			//直接拿created的对端顶点
    			GraphTraversal<Vertex, Vertex> gt = g.V().has("name","marko").out("created");
    			List<Vertex> vs =  gt.toList();
    			for(Vertex v:vs)
    			{ 
    // v.toString()
    				String name = v.value("name");
    				System.out.println(name);
    				System.out.println(v.toString());
    			}
    			//获取顶点的所有
    // GraphTraversal<Vertex, Object> gt = g.V().has("name","marko").out("created").values("name");
    		}
    		catch (Exception e) 
    		{ 
    			e.printStackTrace();
    		}
    		finally
    		{ 
    			if(graph != null)
    			{ 
    				try { 
    					graph.close();
    				} catch (Exception e) { 
    					e.printStackTrace();
    				}
    			}
    		}
    		factory.close();
    	}
    }

**使用纯gremlin查询语句**

import java.util.Iterator;
    
    import org.apache.tinkerpop.gremlin.orientdb.OrientGraph;
    import org.apache.tinkerpop.gremlin.orientdb.OrientGraphFactory;
    import org.apache.tinkerpop.gremlin.orientdb.executor.OGremlinResult;
    import org.apache.tinkerpop.gremlin.orientdb.executor.OGremlinResultSet;
    
    import com.orientechnologies.orient.core.record.OVertex;
    import com.orientechnologies.orient.core.sql.executor.OResult;
    
    
    public class TP3Test3 
    { 
    	public static void main(String[] args) 
    	{ 
    		test3();
    	}
    	public static void test3()
    	{ 
    		//创建图工厂
    		OrientGraphFactory factory = new OrientGraphFactory("remote:192.168.1.32/test2","root","xxx");
    		
    // //返回事务图
    // OrientGraph graph = factory.getTx();
    		
    		//返回非事务图
    		OrientGraph graph = factory.getNoTx();
    		try
    		{ 
    // OGremlinResultSet gremlinResultSet = graph.executeSql("select from Person");
    			OGremlinResultSet gremlinResultSet = graph.execute("gremlin", "g.V()", null);
    			Iterator<OGremlinResult> iterator = gremlinResultSet.iterator();
    			while(iterator.hasNext())
    			{ 
    				OGremlinResult gremlinResult = iterator.next();
    				OResult oresult = gremlinResult.getRawResult();
    				OVertex v = oresult.getVertex().get();
    				System.out.println(v.toJSON());
    			}
    		}
    		catch (Exception e) 
    		{ 
    			e.printStackTrace();
    		}
    		finally
    		{ 
    			if(graph != null)
    			{ 
    				graph.close();
    			}
    		}
    		factory.close();
    	}
    }

三.相关pom

<dependency>
              <groupId>com.orientechnologies</groupId>
              <artifactId>orientdb-server</artifactId>
              <version>3.0.30</version>
          </dependency>
     <dependency>
      		<groupId>com.orientechnologies</groupId>
     			<artifactId>orientdb-graphdb</artifactId>
        <version>3.0.30</version>
    </dependency>
    <dependency>
              <groupId>com.orientechnologies</groupId>
              <artifactId>orientdb-lucene</artifactId>
              <version>3.0.30</version>
          </dependency>
          <dependency>
              <groupId>com.orientechnologies</groupId>
              <artifactId>orientdb-studio</artifactId>
              <version>3.0.30</version>
              <type>zip</type>
          </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orientdb-core</artifactId>
        <version>3.0.30</version>
    </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orientdb-client</artifactId>
        <version>3.0.30</version>
    </dependency>
    <dependency>
              <groupId>com.orientechnologies</groupId>
              <artifactId>orientdb-distributed</artifactId>
              <version>3.0.30</version>
          </dependency>
          <dependency>
              <groupId>com.orientechnologies</groupId>
              <artifactId>orientdb-gremlin</artifactId>
              <version>3.0.30</version>
          </dependency>
    <dependency>
       <groupId>org.apache.tinkerpop</groupId>
       <artifactId>gremlin-core</artifactId>
       <version>3.3.10</version>
    </dependency>
    <dependency>
              <groupId>org.apache.tinkerpop</groupId>
              <artifactId>gremlin-groovy</artifactId>
              <version>3.3.10</version>
          </dependency>
          <dependency>
              <groupId>org.apache.tinkerpop</groupId>
              <artifactId>gremlin-console</artifactId>
              <version>3.3.10</version>
          </dependency>
    <dependency>
       <groupId>org.apache.tinkerpop</groupId>
       <artifactId>gremlin-driver</artifactId>
       <version>3.3.10</version>
    </dependency>
    <dependency>
       <groupId>org.apache.tinkerpop</groupId>
       <artifactId>tinkergraph-gremlin</artifactId>
       <version>3.3.10</version>
    </dependency>