我想编写一个查询来接收来自任何子节点的所有父节点直到根节点,顺序为:
我找到了一些解决方案,但结果有一些重复或节点未排序。提前致谢。
我有一个 neo4j 数据库,其中一些数据存储在 Points 中(例如coordinates: point({srid:4326, x:-4.224099535439225, y:52.10621881941465})
)。
我希望 neo4j 浏览器在视觉布局图形时尊重这些点。有没有办法与其布局管理器交互,并要求它使用这些点?
我最近在安装 Debian 7.8 时一直在玩 neo4j。这很棒!
今天我使用 neo4j-import 工具导入了大约 100000 个节点和 75000 个关系。我停止了 neo4j 服务并将导入的数据库复制到 /var/lib/neo4j/data/graph.db - 但现在 Neo4j 服务将无法启动
Starting Neo4j Server...WARNING: not changing user
process [4963]... waiting for server to be ready....... Failed to start within 120 seconds.
Neo4j Server may have failed to start, please check the logs.
这很奇怪,因为它不会等待 120 秒才能启动 - 最多 5 秒。生成的唯一日志是 /var/log/neo4j 中的 console.log
2015-07-01 00:10:24.363+0000 INFO [API] Setting startup timeout to: 120000ms based on 120000
2015-07-01 00:10:26.501+0000 INFO [API] Successfully shutdown Neo4j Server.
这不是很有用。当我删除数据库时,neo4j 能够启动。我将graph.db复制到我的Windows安装中,它运行良好,我可以搜索节点等。所以也许它与我的Debian上的配置有关?我在 /etc/neo4j/neo4j-server.properties 添加了一行
org.neo4j.server.startup_timeout=0
但这没有任何改变,几秒钟后服务启动仍然超时。有任何想法吗?
这是 graph.db messages.log - 当我尝试启动服务时没有附加任何内容
2015-07-01 01:58:12.142+0000 INFO [org.neo4j]: Import starting
2015-07-01 01:58:12.282+0000 INFO [org.neo4j]: Creating new db @ /var/www/ddl/scripts/./graph.db/neostore
2015-07-01 01:58:13.238+0000 INFO [org.neo4j]: Missing counts store, rebuilding it.
2015-07-01 01:58:13.607+0000 INFO [org.neo4j]: No lucene scan store index found, this might just be first use. Preparing to rebuild.
2015-07-01 01:58:13.663+0000 INFO [org.neo4j]: No lucene scan store index found, this might just be first use. Preparing to rebuild.
2015-07-01 01:58:13.952+0000 INFO [org.neo4j]: Rebuilding lucene scan store, this may take a while
2015-07-01 01:58:13.955+0000 INFO [org.neo4j]: Lucene scan store rebuilt (roughly -1 nodes)
2015-07-01 01:58:30.337+0000 INFO [org.neo4j]: IMPORT DONE in 18s 182ms. Imported:
95941 nodes
158227 relationships
369482 properties
2015-07-01 01:58:30.341+0000 INFO [org.neo4j]: About to rotate counts store at transaction 1 to [/var/www/ddl/scripts/./graph.db/neostore.counts.db.b], from [/var/www/ddl/scripts/./graph.db/neostore.counts.db.a].
2015-07-01 01:58:30.344+0000 INFO [org.neo4j]: Successfully rotated counts store at transaction 1 to [/var/www/ddl/scripts/./graph.db/neostore.counts.db.b], from [/var/www/ddl/scripts/./graph.db/neostore.counts.db.a].