Datastax Java Driver を使用して完全にグラフを作成したいと考えています。なんとか頂点を挿入できましたが、既存の頂点にエッジを追加する方法がわかりません。
次のコードを実行すると
session.executeGraph("parent = g.V().has('businessId','sys-1').next()");
session.executeGraph("child = g.V().has('businessId','sys-2').next()");
session.executeGraph("parent.addEdge('consistsOf', child)");
例外が発生します
Exception in thread "main" com.datastax.driver.core.exceptions.InvalidQueryException: No such property: parent for class: Script285
at com.datastax.driver.core.exceptions.InvalidQueryException.copy(InvalidQueryException.java:50)
at com.datastax.driver.dse.DriverThrowables.propagateCause(DriverThrowables.java:29)
at com.datastax.driver.dse.DefaultDseSession.executeGraph(DefaultDseSession.java:77)
at com.datastax.driver.dse.DefaultDseSession.executeGraph(DefaultDseSession.java:64)
at de.pratho.valpro.tools.Main.main(Main.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: com.datastax.driver.core.exceptions.InvalidQueryException: No such property: parent for class: Script285
at com.datastax.driver.core.Responses$Error.asException(Responses.java:136)
at com.datastax.driver.core.DefaultResultSetFuture.onSet(DefaultResultSetFuture.java:179)
at com.datastax.driver.core.RequestHandler.setFinalResult(RequestHandler.java:173)
at com.datastax.driver.core.RequestHandler.access$2500(RequestHandler.java:43)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.setFinalResult(RequestHandler.java:788)
at com.datastax.driver.core.RequestHandler$SpeculativeExecution.onSet(RequestHandler.java:607)
at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:1012)
at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:935)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:276)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:263)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
at java.lang.Thread.run(Thread.java:745)
gremlin_console_window で gremlin ステートメントを実行すると、問題なく動作します。だから私は変数が好きparentでchild、Java内で機能していないと思いますDseSessionか?
残念ながら、Java ドライバーを適切に操作する方法に関する情報はあまり見つかりませんでした。