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我从这里的文档和帖子中了解到，在为 neo4j 中的节点属性启用自动索引后，必须为每个节点再次设置属性才能将属性添加到索引中。

Neo4j 版本 1.9.M05

使用 DrWho 数据库，这个 groovy 代码旨在通过设置属性将 Doctor 字符添加到自动索引字符属性中。此代码不起作用。运行后自动节点索引为空

你能看到我做错了什么吗？

import org.neo4j.graphdb.*
import org.neo4j.graphdb.factory.*
import org.neo4j.graphdb.index.*

db_path = '/Users/mike/Documents/code/neo4j/dbs/drwho.db'

// use Builder to initialize settings for embedded db
// include autoindexing
GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabaseBuilder( db_path ).
  setConfig(GraphDatabaseSettings.node_auto_indexing, "true" ).
  setConfig(GraphDatabaseSettings.node_keys_indexable, "character" ).
  newGraphDatabase()

DoctorKey="character"
DoctorValue="Doctor"
Node Doctor = graphDb.getNodeById( 1 )
assert Doctor.hasProperty( DoctorKey )
assert Doctor.getProperty( DoctorKey ).equals( DoctorValue )

// drop and add character property to add it to auto_index
Transaction tx = graphDb.beginTx()
try
{
  Doctor.removeProperty( DoctorKey )
  Doctor.setProperty( DoctoryKey, DoctorValue )
  tx.success()
} catch ( Exception e ) { tx.failure()
} finally               { tx.finish() }

assert Doctor.hasProperty( DoctorKey )
assert Doctor.getProperty( DoctorKey ).equals( DoctorValue )

// query index
ReadableIndex<Node> autoNodeIndex = graphDb.index().
  getNodeAutoIndexer().
  getAutoIndex()

// DoctorAgain is NULL
Node DoctorAgain =  autoNodeIndex.get( DoctorKey , DoctorValue ).getSingle()
assert DoctorAgain == Doctor


addShutdownHook {
  graphDb.shutdown()
}
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1 回答 1

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这不是与 Neo4j 相关的问题，只是代码中有错字。如果你更换

Doctor.setProperty( DoctoryKey, DoctorValue )

和

Doctor.setProperty( DoctorKey, DoctorValue )

有用。

于 2013-03-29T18:20:57.410 回答