apoc.cypher.runFileReadOnly

Procedure APOC Full

apoc.cypher.runFileReadOnly(file or url,[{statistics:true,timeout:10,parameters:{}}]) - runs each READ statement in the file, all semicolon separated - currently no schema operations

Signature

apoc.cypher.runFileReadOnly(file :: STRING?, config = {} :: MAP?) :: (row :: INTEGER?, result :: MAP?, fileName :: STRING?)

Input parameters

Name	Type	Default
file	STRING?	null
config	MAP?	{}

Name

Type

Default

file

STRING?

null

config

MAP?

{}

Config parameters

The procedure support the following config parameters:

Table 1. Config parameters
name	type	default	description
reportError	boolean	false	Returns a entry row with key `error` and value the error occurred, if any.
statistics	boolean	true	Returns an additional row with the query statistics, leveraging the `org.neo4j.graphdb.QueryStatistics` api
timeout	long	10	The single query timeout (in seconds)
queueCapacity	long	100	The capacity of the `java.util.concurrent.BlockingQueue` used to aggregate the results.
parameters	Map<String, Object>	Empty map	Optional parameter map to be used with the `apoc.schema.runFile` and `apoc.schema.runFiles` procedures.

Output parameters

Name	Type
row	INTEGER?
result	MAP?

Name

Type

row

INTEGER?

result

MAP?

Reading from a file

By default importing from the file system is disabled. We can enable it by setting the following property in apoc.conf:

apoc.conf

apoc.import.file.enabled=true

If we try to use any of the import procedures without having first set this property, we’ll get the following error message:

Failed to invoke procedure: Caused by: java.lang.RuntimeException: Import from files not enabled, please set apoc.import.file.enabled=true in your apoc.conf

Import files are read from the import directory, which is defined by the dbms.directories.import property. This means that any file path that we provide is relative to this directory. If we try to read from an absolute path, such as /tmp/filename, we’ll get an error message similar to the following one:

Failed to invoke procedure: Caused by: java.lang.RuntimeException: Can’t read url or key file:/path/to/neo4j/import/tmp/filename as json: /path/to/neo4j//import/tmp/filename (No such file or directory)

We can enable reading files from anywhere on the file system by setting the following property in apoc.conf:

apoc.conf

apoc.import.file.use_neo4j_config=false

Neo4j will now be able to read from anywhere on the file system, so be sure that this is your intention before setting this property.

Usage Examples

Given this dataset:

CREATE (:ReturnQuery {id:1}), (:ReturnQuery {id:2}), (:ReturnQuery {id:3});
CREATE (n:Other {id: 4});

and this file, located in .$NEO4J_HOME/import:

match.cypher

MATCH (n:ReturnQuery) RETURN n;
MATCH (n:Other) RETURN n;

we can run the Cypher commands in match.cypher, by running the following query:

CALL apoc.cypher.runFileReadOnly("match.cypher");

Table 2. Results
row	fileName
result	0
match.cypher	{"n":{"identity":1,"labels":["ReturnQuery"],"properties":{"id":1},"elementId":"…"}}
1	match.cypher
{"n":{"identity":2,"labels":["ReturnQuery"],"properties":{"id":2},"elementId":"…"}}	2
match.cypher	{"n":{"identity":3,"labels":["ReturnQuery"],"properties":{"id":3},"elementId":"…"}}
0	match.cypher

More documentation of apoc.cypher.runFileReadOnly