举例来说,如果我有一个交易创造了两个节点是否有可能有不同类型的节点中的Neo4j图形数据库
node1 = db.graphDb.createNode();
node2 = db.graphDb.createNode();
// index user id
node1.setProperty("abc", "fkdjasflasdjlf");
db.nodeIndex.add(node1, "abc", "fkdjasflasdjlf");
节点1拥有财产“ABC”,但节点2没有。
然后我试图在节点上查询,如清单所有具有财产“ABC”等于“fkdjasflasdjlf”的节点。
ExecutionResult result = engine.execute("START n=node(*) WHERE n.abc = 'fkdjasflasdjlf' return n ");
Neo4j的产生异常
Exception in thread "main" org.neo4j.cypher.EntityNotFoundException: The property 'abc' does not exist on Node[0]
at org.neo4j.cypher.internal.commands.expressions.Property.apply(Property.scala:35)
at org.neo4j.cypher.internal.commands.expressions.Property.apply(Property.scala:29)
at org.neo4j.cypher.internal.commands.Equals.isMatch(ComparablePredicate.scala:60)
at org.neo4j.cypher.internal.pipes.FilterPipe$$anonfun$createResults$1.apply(FilterPipe.scala:29)
at org.neo4j.cypher.internal.pipes.FilterPipe$$anonfun$createResults$1.apply(FilterPipe.scala:29)
at scala.collection.Iterator$$anon$22.hasNext(Iterator.scala:390)
at scala.collection.Iterator$$anon$19.hasNext(Iterator.scala:334)
at scala.collection.Iterator$$anon$19.hasNext(Iterator.scala:334)
at org.neo4j.cypher.PipeExecutionResult.hasNext(PipeExecutionResult.scala:138)
at scala.collection.Iterator$$anon$19.hasNext(Iterator.scala:334)
at scala.collection.JavaConversions$IteratorWrapper.hasNext(JavaConversions.scala:562)
at neo4j.TestNodeSearch.main(TestNodeSearch.java:59)
Caused by: org.neo4j.graphdb.NotFoundException: 'abc' property not found for NodeImpl#0.
at
org.neo4j.kernel.impl.core.Primitive.newPropertyNotFoundException(Primitive.java:184)
at org.neo4j.kernel.impl.core.Primitive.getProperty(Primitive.java:179)
at org.neo4j.kernel.impl.core.NodeImpl.getProperty(NodeImpl.java:52)
at org.neo4j.kernel.impl.core.NodeProxy.getProperty(NodeProxy.java:155)
at org.neo4j.cypher.internal.commands.expressions.Property.apply(Property.scala:33)
那么,有没有办法来支持节点的“不同种类”或目前,只有一种类型的节点支持?
非常感谢!