NOTES-Neo4j.txt

Install Neo4j
=============

Download Neo4j Desktop version AppImage from Neo4j website.
	chmod a+x neo4j-desktop-1.5.0-x86_64.AppImage
Execute the AppImage.  Wait for it to initialize.

Add a new DBMS instance.  Use default the name, set a password.
Then click button to 'Start' the DBMS.  Wait for it to start.

On left menu, go to "Graph Apps" then fire up "Neo4j Browser".
If all goes well you'd see notice saying you're connected as user 'neo4j'
	with connection: bolt://localhost:7687

 (Alternatively, Neo4j Browser can be opened in local browser via this URL:
	http://localhost:7474/browser/
 Then within the browser, log into
	neo4j://localhost:7687
 using the new password you entered for the DBMS. )

 (From older versions, there is a first-time password: neo4j / neo4j.
 Seems no longer needed. )

Now you're ready to use the Neo4j graph DB server.
Refer to NOTES-Cyphers.txt for frequently used Cypher commands.

Useful Cyphers
==============

Delete all nodes and relationships:
	MATCH (n:Type) DETACH DELETE n

Delete all relationships:
	match ()-[r]->() delete r;

Return all relationships:
	Match (n)-[r]->(m) Return n,r,m

Return all nodes and relationships, including singleton nodes:
	MATCH (n) OPTIONAL MATCH (n)-[r]-() RETURN n, r;

Create relationship:
	MATCH (a:Char), (b:Char) WHERE ID(a) - ID(b) = 1
	CREATE (a)-[r:Smaller]->(b)


**** OLD STUFF, NO LONGER APPLIES TO NEW VERSION ****

	Install Neo4j python driver:
		pip3 install neo4j
	Install Neo4j desktop on Ubuntu, follow instructions from this link:
		https://neo4j.com/docs/operations-manual/current/installation/linux/debian/#debian-installation
	Set password:
		sudo neo4j-admin set-initial-password l0wsecurity --require-password-change
	Open Neo4j browser:
		http://localhost:7474/browser/

	Stop database and save a copy
	=============================
	command line:
		> sudo neo4j stop
		> service neo4j stop  (this is needed!!)
		> sudo neo4j-admin dump --to=graph-database-0.db 

	Restore previously saved database
	=================================
		> sudo neo4j-admin load --from=graph-database-0.db --database=neo4j --force