Load only few samples from large csv file in neo4j

问题

I am new for neo4j db. I've a large csv file which cannot fit in my machine's ram. Before I load all the records in db using USING PERIODIC COMMIT, I want to test my cypher query on the small sample of data. How can I load load just 1000 rows of data and test out my query.

The data has columns in simplified form as [Employee, CompanyName]. I want to create relationship as (:Employee)-[:Employed]->(:Company). The Employee and the CompanyName nodes are already loaded into the database.

回答1:

You can limit the rows you want to import with:

USING PERIODIC COMMIT
LOAD CSV WITH HEADERS 'file:///yourcsvfile.csv' AS row
WITH row LIMIT 1000
...

and then continue with your usual import Cypher statements. This will read only the first 1000 lines of your file.

回答2:

Just create a csv file with the first 1000 lines of your file (and then work with that). On Linux/Unix :

head -1000 yourinputfile.csv > output1000.csv

On Windows (powershell) :

Get-Content "yourinputfile.csv" | select -First 1000 | Out-File "output1000.csv"

Hope this helps.

Regards, Tom

来源：https://stackoverflow.com/questions/45809240/load-only-few-samples-from-large-csv-file-in-neo4j