Neo4j Metabase driver

SQL and Cypher support for Neo4j on Metabase

Neo4j Prerequisites

• Make sure your neo4j instance / cluster has APOC enabled.

Without APOC, the underlying BI connector will not be usable. For more information on the permission set required, download the BI connector docs

Installation

Run with Docker

git clone https://github.com/bbenzikry/metabase-neo4j-driver.git
cd metabase-neo4j-driver
docker build -t metabase/neo4j .
docker run --name metabase-neo4j -p 3000:3000 metabase/neo4j

JAR installation

• Download the latest metabase version from here
• Download the latest neo4j.metabase-driver.jar from the releases page
• Create a metabase folder and place your metabase.jar
• Copy neo4j.metabase-driver.jar to the plugins/ folder

  .
  ├── metabase.jar
  └── plugins
      └── neo4j.metabase-driver.jar
  

• Run java -jar metabase.jar

Using Cypher

• Cypher is currently only implemented for explicit querying
• All cypher queries must return column based results ( aggregation results or column values )

Working with a relational model on graphs

The JDBC driver exposes schemas for Relationships and Nodes

• Relationships

  • The driver creates one table for each distinct combination of source label, relationship type, and target label.

• Nodes

  • The driver only creates tables for nodes that have labels.
  • The driver creates one table for each distinct combination of node labels.

  Given

  • Node1, with the label [Alphabet]
  • Node2, with the label [Google]
  • Node3, with the labels[Alphabet,Google]

  The following tables will be created:

  • Alphabet
  • Google
  • Alphabet_Google

• Naming Separators between node label names and relationship names is an underscore by default

To change the Node name seperator, you can use the LabelSeparator JDBC property, or RelNodeSeperator for Relationship tables.

JDBC properties can be added via the driver configuration as shown in the image below.

For an up to date list of allowed configuration values, please download the JDBC driver

Building the driver

Prerequisites

Install Metabase as a local maven dependency, compiled for building drivers

Clone the Metabase repo

cd /path/to/metabase_source
lein install-for-building-drivers

Download and install the Neo4j BI connector

• Get the connector here

# cp the jar to the maven dir
mkdir -p ~/.m2/repository/neo4j/neo4j-bi-jdbc/1.0.0 && cp JAR_PATH ~/.m2/repository/neo4j/neo4j-bi-jdbc/1.0.0/

Build the driver

# (In the directory where you cloned this repository)
lein clean
DEBUG=1 LEIN_SNAPSHOTS_IN_RELEASE=true lein uberjar

Copy it to your plugins dir and restart Metabase

mkdir -p /path/to/metabase/plugins/
cp target/uberjar/neo4j.metabase-driver.jar /path/to/metabase/plugins/
jar -jar /path/to/metabase/metabase.jar

or:

mkdir -p /path/to/metabase_source/plugins
cp target/uberjar/neo4j.metabase-driver.jar /path/to/metabase_source/plugins/
cd /path/to/metabase_source
lein run

Caveats

This is a WIP.

It is not heavily tested and is not compatible with neo4j 3.5 ( even though the underlying JDBC driver is )

TODO

• ~~Edge properties~~

• ~~Timestamp casting support~~

• ~~Cypher support~~

• ~~Multiple database support~~

• ~~Metabase variable substitution~~

• Testing

• CI

Future

• Support complex results in cypher ( e.g. non relational projections )
• Graph viz support

Known issues

• Initial DB creation and/or sync may time out. You can configure a higher timeout value with the MB_DB_CONNECTION_TIMEOUT_MS environment variable.

• In a standalone neo4j installation, if you encounter the error below, use StrictlyUseBoltScheme=true in the JDBC options ( see: #12 )

[Simba] [Neo4jJDBCDriver](100041) An error has occurred during data source connection: Failed to obtain connection towards READ server

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