PROSAGA码农传奇-titan-在Titan Graph数据库中创建顶点和边的问题

<div class =“post-text”itemprop =“text”>
  <OL>
    <LI>
      顶点ID和边缘ID由Titan生成和分配。如果您想拥有自己的标识符，则应定义属性并为其编制索引。
    </LI>
    <LI>
      <P>
        错误
         <code>
          No such property: TId
        </code>
         表示您正在尝试使用变量
         <code>
          TId
        </code>
         尚未初始化的。您应该在尝试索引之前定义顶点属性
      </p>
       <pre>
        <code>
          gremlin> graph = TitanFactory.open('conf/titan-cassandra-es.properties')
==>standardtitangraph[cassandrathrift:[127.0.0.1]]
gremlin> mgmt = graph.openManagement()
==>com.thinkaurelius.titan.graphdb.database.management.ManagementSystem@4b97b3d2
gremlin> TId = mgmt.makePropertyKey("TId").dataType(Integer.class).cardinality(Cardinality.SINGLE).make()
==>TId
gremlin> mgmt.buildIndex("TId",Vertex.class).addKey(TId).unique().buildCompositeIndex()
==>TId
gremlin> mgmt.commit()
==>null
gremlin> t1 = graph.addVertex(label, "Testbed", "Name", "testbed1","Status","A","TId",101)
==>v[4200]
gremlin> r2= graph.addVertex(label, "Router", "RStatus","F","RId",1002, "TId", 101)
Adding this property for key [TId] and value [101] violates a uniqueness constraint [TId]

</code>
      </pre>
    </LI>
  </醇>
  <P>
    请参阅Titan文档
    <a href="http://s3.thinkaurelius.com/docs/titan/1.0.0/schema.html#_defining_property_keys" rel="nofollow noreferrer">
      架构和数据建模
    </A>
     并且
    <a href="http://s3.thinkaurelius.com/docs/titan/1.0.0/indexes.html" rel="nofollow noreferrer">
      索引以获得更好的性能
    </A>
    。
  </p>
</DIV>