在neo4j中将节点从一个图搜索并复制到另一个图

Question

Suppose you have 3 graphs with where some data is shared among the graphs. Is there then a way programatically to do the following:

1. In graph 1 find a node

2. Search in graph 2 for that node (through property name)

3. If step 2 finds a match, then I would like to take all the nodes connected to the found node in graph 2 (including "nodes indirectly connected") and connect them to the node in graph 1.

Essentially I would like to search for a particular node in a graph, find all the nodes directly or indirectly connected to and copy the entire connection to my original node in graph 1.

Any hints on how to do this would be great. Thanks in advance.

Using Neo4j 1.9 and not too familar with Cypher queries and it is the community edition.

Answer 1

If you have all your 3 graphs in a single database it is simple.

do the query to find your node

START a=node.... MATCH ... WHERE ... RETURN a.prop as prop, ID(a) as id

assuming your nodes are indexed for the properties that are interesting for you, do an index lookup for that property

START a=node({id}), b=node:index(property={prop}) 
MATCH (b)-->(c) 
CREATE (c)-[:REL_TYPE]->(a)