用Gremlin加載Titan圖

Question

我是TitanDB的新手。 我在cassandra和Java中使用它：

配置文件：

storage.backend=cassandra
storage.hostname=@CASSANDRA_CLUSTER_INNER_ADDRESS@

Java代碼：

TitanGraph tg = TitanFactory.open(/*the configuration above*/);
if (tg.isOpen()) {
    TitanManagement tm = tg.getManagementSystem();
    PropertyKey key = tm.getPropertyKey(name);
    /* The rest of the nice working code */
}

Java代碼工作正常，我可以查詢圖表，執行CRUD操作等。

現在，我想在不使用JAVA的情況下查詢圖形。 最初，我嘗試使用cqlsh時看到了以下內容：

Keyspace titan
--------------
edgestore        graphindex        system_properties        systemlog  txlog
edgestore_lock_  graphindex_lock_  system_properties_lock_  titan_ids

深入研究后，我了解到我需要使用gremlin工具來正確查詢TitanDB。 但是，當我嘗試通過gremlin連接TitanDB時，會收到以下消息：

    gremlin> TitanFactory.open("cassandra.local")
No such property: TitanFactory for class: groovysh_evaluate
Display stack trace? [yN] y
groovy.lang.MissingPropertyException: No such property: TitanFactory for class: groovysh_evaluate
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:50)
        at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:49)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:231)
        at groovysh_evaluate.run(groovysh_evaluate:51)
        at groovysh_evaluate$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
        at groovysh_evaluate$run.call(Unknown Source)
        at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:67)
        at org.codehaus.groovy.tools.shell.Interpreter$evaluate.call(Unknown Source)
        at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:152)
        at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:114)
        at org.codehaus.groovy.tools.shell.Shell$leftShift$0.call(Unknown Source)
        at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:88)
        at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
        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 org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1079)
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:128)
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:148)
        at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:100)
        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 org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:272)
        at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:52)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:137)
        at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:57)
        at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
        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 org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1079)
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:128)
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:148)
        at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:66)
        at com.tinkerpop.gremlin.groovy.console.Console.<init>(Console.java:60)
        at com.tinkerpop.gremlin.groovy.console.Console.main(Console.java:102)

我的問題是：如何讓Gremlin了解TitanFactory，最后如何在現有的TitanDB v。0.5.4中使用gremlin？

謝謝。

Answer 1

如果您從TinkerPop站點下載了Gremlin 2.x，則我希望看到您遇到的錯誤，因為它在類路徑中沒有Titan庫。

您應該從thinkaurelius下載Titan 0.5.4，並遵循Gremlin Shell文檔。

http://s3.thinkaurelius.com/docs/titan/0.5.4/getting-started.html#_downloading_titan_and_running_the_gremlin_shell