Neo4j Cypher-使用两个CSV文件创建关系

Question

I'm new to Neo4j and I'm currently working on to build a citation network.

I have two CSV files one containing the node properties and other containing relationship properties.

PAPERS.CSV -

paperId, title, year
123, abc, 1900
234, cde, 1902
456, efg, 1904

CITES.CSV -

fromId, ToId
123, 234
234, 456

My graph should look like (123)--cites-->(234)--cites-->(456) . Using these files how do I create a relationship between nodes?

Answer 1

You should avoid space in the header names and in the data too. If it is out of your control then you can use trim function and backticks to reference a headername. But normally, your csv should be clean. Your files should be in the import directory of the neo4j. Otherwise you should comment out dbms.directories.import=import property in neo4j.conf.

You can create nodes like this:

   LOAD CSV WITH HEADERS FROM "file:///PAPERS.CSV" as line
   CREATE (p:Paper {paperId:trim(line.paperId), title: trim(line.` title`), year: trim(line.` year`)});

And you can create relationships like this:

   LOAD CSV WITH HEADERS FROM "file:///CITES.CSV" as line
   MATCH (p1:Paper {paperId:trim(line.fromId)})
   MATCH (p2:Paper {paperId:trim(line.` ToId`)})
   CREATE (p1)-[:CITES]->(p2);