Such as the example movies database
Is it possible to extract the single statement that creates the current database with all it's properties, relations and nodes?
You can install APOC procedures and use apoc.export.cypher.all. From the docs:
apoc.export.cypher.all(file,config) - exports whole database incl.
indexes as cypher statements to the provided file
Related
I have used Neo4J ETL tool and create a Neo4J database from Postgres SQL and this looks perfect. I can see all nodes, relationships, data, etc.
Now I want to see all the database file, the Cypher queries for all node and relationship creation along with different constraint applied to this database.
How can I view this? I can see database folder is empty for Neo4J home,
C:\Users\I\.Neo4jDesktop\relate-data\dbmss\dbms-9cf178b6-f37f-4139-8b80-dadf0fa03866\data\databases
2nd question, can I generates graphql schema from the Cypher script using any tool or some mean?
Thanks!
I think below codes can help you to get meta-data and schema
// Show meta-graph
CALL db.schema.visualization()
// List node labels
CALL db.labels()
// List relationship types
CALL db.relationshipTypes()
I am trying to import multiple CSVs, exported from multiple different Neo4j databases with APOC's export, into one big database. Some of the nodes are shared.
There is a problem that relationships in the CSV use the Neo4j's internal IDs for the _start and _end, instead of the nodes' "primary key" -- is the #Index with primary = true (same as #Id) a thing of the Neo4j or the Neo4j's Java OGM?. This is bad because these multiple exports could (and will) have same internal IDs for different nodes and the merged graph will be a mess. The same applies for nodes, I want to merge them based on the primary key during the import instead of creating duplicates.
Is there a way to export a Neo4j database with APOC in a way that it relies on primary keys instead of internal IDs? I need a CSV or JSON file, no CQL. Or is there another way of exporting a Neo4j database in a way that I can import multiple exports and they will merge seamlessly? ...something different than writing my CSV exporter and imported, this will be the very last option.
I have two cases:
case 1:export a part of data in neo4j database A to database B,like data of Label "Person" in database A ,I wanna export "Person" data from A to B
case 2: export whole data from A to B
so how to deal with these two cases? thanks
APOC allows to export the full graph or subgraphs into a cypher file consisting of create statements, see https://neo4j-contrib.github.io/neo4j-apoc-procedures/#_export_to_cypher_script for details.
The other option would be access the other database via the neo4j jdbc driver and use apoc.load.jdbc to retrieve data from there.
I want to create a new Database in neo4j using Cypher as I am not a Java (or Programming language) guy but a Database person ....Could I create a neo4j database using Cypher before creating nodes and relationships ...I am using ne04j community console and would like to create a new database
Thanks !
There is only one database.
You can clean out your current data by either stopping the server and removing the database on disk /path/to/neo4j/data/graph.db and starting it again.
Or by executing a Cypher statement like:
MATCH (n)
OPTIONAL MATCH (n)-[r]->()
DELETE n,r
You dont need to create a new database as(neo4j folder)\data\graph.db is the default path for the database.Neo4j is different from the relational databases.Folder it self is a database.In a graph database you have to create three things: nodes,relationships and properties.
If you want to change the database path you can change the path in conf/neo4j-server.properties.
You can also refer below link:
How to delete/create databases in Neo4j?
Everyone familiar with MySQL has likely used the mysqldump command which can generate a file of SQL statements representing both the schema and data in a MySQL database.
These SQL text files are commonly used for many purposes: backups, seeding replicas, copying databases between installations (- copy prod DBs to staging environments etc) and others.
Is there a similar tool for Neo4j that can dump an entire graph into a text file of Cypher statements, that when executed on an empty database would reconstruct the original data?
Thanks.
In neo4j version 2 (e.g. 2.0.0M3), using neo4j-shell, you can use the command
dump
which will create the cypher statements (pretty much like mysqldump would do. To read in the file you can use
cat dump.cql | neo4j-shell
Cypher is just a query language for Neo4J just as SQL is for MySQL or other relational databases. If you wish to transfer the db, then you just need to copy the folder containing the database files. Simple.
For example my folder simple-graph contains all the db files. Just copy the folder and store it at some other location. You can directly start using it as:
GraphDatabaseServiceraphDb = new EmbeddedGraphDatabase(DB_PATH);//DB_PATH is path to the new location
You can use the procedure apoc.export.cypher.all() to dump all the data in your database.
For example, you can dump the database into a single file called dump-file.cypher:
neo4j#neo4j> CALL apoc.export.cypher.all('dump-file.cypher');
For details of the procedure, please see the documentation: https://neo4j.com/labs/apoc/4.4/overview/apoc.export/apoc.export.cypher.all/.