Is there a way to specify a Neo4j database location at command invocation time, instead of via a file? So instead of putting the following in neo4j-server.properties:
org.neo4j.server.database.location=/path/to/db
Something like:
neo4j --db=/path/to/db
I'm still on Neo4j 2.1.6 but advice on any version is better than nothing.
My particular use case at this time is, my regular DB is having problems and I want to quickly spin up a blank database just to narrow down the problem to binaries or data (yes I've checked the log files!).
You could use sed to edit neo4j-server.properties before starting neo4j. Something like:
sed -i.bak s/org.neo4j.server.database.location=databases/org.neo4j.server.database.location=newdatabase/g neo4j-community-2.1.6/conf/neo4j-server.properties
You could create a simple script that takes the path as a param. So something like:
./start-neo.sh mytestdb where start-neo.sh is:
sed -i.bak s/org.neo4j.server.database.location=databases/$1/g neo4j-community-2.1.6/conf/neo4j-server.properties
neo4j-community-2.1.6/bin/neo4j start
will set org.neo4j.server.database.location=mytestdb and then start neo4j.
Related
I have a CQL file called Novis.cql. Its somewhere random on my harddrive, but I want to run it in Neo4J to create my graph (it contains 500+ lines of code).
Where do I have to place it? And what command do I have to run nowadays to get it working? I've read and searched for answers, but some of the commands like Neo4jshell dont seem to work any longer...
Any help would be very appreciated!
The cypher-shell tool has been available for a while (starting with version 3.0, if not earlier), and you can use it to execute a Cypher query from a file that can be anywhere in your file system.
For example (on a linux/unix system), a command line like this will work (if you are in the neo4j home directory):
cat /my/full/path/my_code.cql | bin/cypher-shell -u neo4j -p secret
In neo4j 4.0 a new -f option was added to make it simpler:
bin/cypher-shell -u neo4j -p secret -f /my/full/path/my_code.cql
I have generated a cypher file and want to load it into neo4j.
The only relevant documentation I could find was about loading csv's.
I also tried the shell but it seems to have no effect
cypher-shell.bat -uneo4j -pne04j < db.cql
Copy paste into localhost:7474/browser makes the browser unresponsive.
In the current Neo4j version you can use Cypher Shell to achieve your goal.
From the docs, Invoke Cypher Shell with a Cypher script from the command line:
$ cat db.cql | bin/cypher-shell -u yourneo4juser -p yourpassword
Note that this example is based in a Linux instalation. If you are using Neo4j with Windows, you will need to adjust this command to your needs.
Not sure when this has been added but in the current version (4.4) an alternative way to load a cypher file to NEO4J (GUI) is by dragging and dropping the cypher file over the web browser, which then offers two options, either to add it to the favorites or to paste it in the editor.
I need to run a Cypher query against a Neo4J database, from a command line (for batch scheduling purposes).
When I run this:
./neo4j-shell -file /usr/share/neo4j/scripts/query.cypher -path /usr/share/neo4j/neo4j-community-3.1.1/data/databases/graph.db
I get this error:
ERROR (-v for expanded information):
Error starting org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory, /usr/share/neo4j/neo4j-community-3.1.1/data/databases/graph.db
There is a running Neo4J instance on that database (localhost:7474). I need the script to perform queries against it.
NOTE: this is a split of the original question, for the sake of tidiness.
To execute (one or more) Cypher statements from a file while the neo4j server is running, you can use the APOC procedure apoc.cypher.runFile(file or url).
Since you mention "batch scheduling", the Job management and periodic execution APOC procedures may be helpful. Those procedures could, in turn, execute calls to apoc.cypher.runFile.
Okay I just spun up a fresh instance of Neo4j-community-3.1.1 today and ran into the exact same problem. Note that I had already created a database using the bulk import tool, so one might need to make a directory for a database (mkdir data/databases/graph.db) before using a shell.
I believe your problem might be that you have an instance of Neo4j process running against the database you are trying to access.
For me, shutting down Neo4j, and then starting the shell with an explicit path worked:
cd /path/to/neo4j-community-3.1.1/
bin/neo4j stop ## assuming it is already running (may need a port specifier)
bin/neo4j-shell -path data/databases/graph.db
For some reason I thought you could have both the shell and the server running, but apparently that is not the case. Hopefully someone will correct me if I am wrong.
I have a solr setup with two cores. I want to schedule a core(core1, backend) for full import frequently(e.g. after every 5 mins), then swap with the live(core0, serving) core from shell command through a shceduler.
For full-import command, I am using following shell command
wget -o - -q -t 1 http://localhost:8080/solr/core1/dataimport?command=full-import
Which works fine. If I do a core swap from browser by hitting
http://localhost:8080/solr/admin/cores?action=SWAP&core=core1&other=core0, I get latest update instantly on search. But if I schedule this URL as shell command similar to dataimport, it doesn't do that swap.
Did you try with
curl
"http://'localhost':8080/solr/admin/cores?action=SWAP&core=core1&other=core0"
from shell?
There is catch with the SWAPs
Apache Solr allows to swap two cores around for non-Cloud configurations. They take each other’s name, so it is a good way to push an updated core into a production without downtime.
But an interesting question is how this is achieved. Normally, core name is it’s directory name too. So, does Solr rename the directory on the filesystem too?
Not really! Instead name property in the core.properties file is updated to use the name of the other core. Usually that property is used to give an alternave name of the core for when the directory naming conventions are not suitable.
The gotcha is - of course - that you still have two directories with right looking names for the cores you see in the Admin UI. So, it is very easy to forget that extra redirection/rename step when troubleshooting somebody else’s - or even your own old - setup.
I would like to predefine some graph data for neo4j and be able to load it, maybe via a console tool. I'd like it to be precisely the same as MySQL CLI and .sql files. Does anyone know if there exists a file format like .neo or .neo4j? I couldn't find such thing in the docs...
We usually do .cql or .cypher for script files. You can pipe it to the shell to run it, like so:
./neo4j-shell -c < MY_FILE.cypher
Michael Hunger was doing some great work on this feature, also, just recently. He got performance up and noise down from the console. I hope it gets into 1.9 release.
From https://groups.google.com/forum/#!topic/opencypher/PO5EnspBLs0
1:
"Sorry for the late reply, but we just wanted to inform you that the official recommendation is to use .cypher.
We'll be formalising this in the style guide soon."
2:
"In training run by Neo4j, we've historically used .cyp. I believe the preference is to use .cypher, and .cyp when an extension of 3 chars is required."
3:
"Note: '.cql' is already used for Cassandra - https://cassandra.apache.org/doc/cql/CQL.html"
From the above extracts:
1st preference is .cypher
2nd preference is .cyp (1st 3 characters of cypher)
Don't use .cql
More:
If you need a color coding in notepad++, download the xml given at https://gist.github.com/nicolewhite/b0344ea475852c8c9571 , import it via menu Language > User Defined Language > Import > Restart the Notepad++, open a file with .cypher that has some cyper query language)
Sample cypher is below:
MATCH (:Person {name: "Ann"}) -[:FB_FRIENDS]-> Create (:Person {name: "Dan"})
Hope that helps someone.
Using neo4j-client as the CLI for Neo4j allows for easy evaluation of scripts. There are several ways to work with a script containing multiple cypher commands:
You can pipe the script in via standard input, e.g.:
neo4j-client -u neo4j -P localhost < my_script.cyp
You can use the command line option --source or -i, e.g.:
neo4j-client -u neo4j -P -i my_script.cyp localhost
You can start an interactive shell, and then source the script:
$ neo4j-client localhost
Username: neo4j
Password: *****
neo4j-client 1.2.1.
Enter `:help` for usage hints.
Connected to 'neo4j://neo4j#localhost:7687'
neo4j>
neo4j> :source my_script.cyp
The extension .cyp is most commonly used for scripts.