Spring Reactive Neo4j

| Posted on by

Query

  1. Neo4j Spring Data
  2. Spring Data Neo4j Reactive
  3. Spring Reactive Neo4j Group
  4. Spring Data Neo4j Example
  5. Neo4j Application

This article is about the spring data for neo4j database. Neo4j is a popular graph database.

This entry was posted on June 24, 2019 at 8:43 AM by Michael, tagged with Neo4j, Reactive Programming, Spring Data Neo4j, Visual Studio Code and categorized in English posts. Related posts More from my site. Feb 04, 2020 Neo4j, the premiere graph database development platform, announced the release of version 4.0 today, which features unlimited scaling among other updates. Graph databases are growing increasingly. Aug 06, 2020 The Neo4j configuration is very straight forward and defines the connection setting for the application to connect to the server. Similar to the most of the other spring data modules, this is a spring configuration which can be defined as XML or Java configuration.

Spring Data Neo4j module is there which is support only imperative style and currently, it’s only in support and maintenance.

Prerequisites:-

You head this article that means you at least heard about Neo4j and spring boot. below are the prerequisites

  1. Neo4j (https://neo4j.com/graphacademy/online-training/introduction-to-neo4j-40/)
  2. Installation of Neo4j on local or use Neo4j sandbox.
  3. Knowledge with spring data and spring boot.
  4. For this example, we are using JDK 11.

If you don’t know anything about the above things then I will recommend you should start exploring these things and come back.

In this example, I am using Neo4j sandbox environment: https://neo4j.com/sandbox/

Neo4j Spring Data

Advantages of using SDN-Rx:

  1. It supports both imperative and reactive development.
  2. Built-in OGM(Object graph mapping) and very lightweight.
  3. Support immutable entities for both Java and kotlin.

Maven/Gradle Dependencies:-

Right now Spring Data Neo4j Reactive starter is not yet part of the official Spring repositories so we have to add that manually, so it won’t be available in the spring initializer website.

PrePare Database:-

Neo4j

For this article, we are using the Neo4j-standard movie graph database because it’s in small size and it’s available in your sandbox as well as in your local.

Neo4j

use this command to start:

Execute the command and deck is an interactive mode, so its seamless execution. The movie database contains a database such as a movie name, release date, crew, director of movie, a rating is given by different individuals or rating companies. The minimal schema relation could be like this

Create Project:

The best way to start with the spring boot project is start.spring.io. Create a spring boot project.

Do not choose Spring Data Neo4j here, as it will show the legacy generation of Spring Data Neo4j that has only imperative support.

Once your project is ready then add the spring data neo4j Rx dependency in your POM or build.gradle.

Configurations:

You can put here your database-specific configurations.

Domain Entity:

All our configurations are done now let us begin and define the domain entity object. As we stated we are using a movie database so we have to create Movie as a domain entity with few properties.

Entities are nodes.

In the movie entity, we defined a movie name, tagline, actors, and directors.

@Node annotation marks the given class is the managed node. @Id annotation to have a unique property and then we defined different relationships using @Relationship annotation. In the same way, we have a Person entity that contains two fields.

In these entities, we just defined one-way relation to have demonstrated things simple but you can also define an entity in such a way to fulfill two-way relationships.

Let us create a repository class then.

This is to demonstrate the reactive programming style so we used here ReactiveNeo4jRepository which is reactive repository implementation.

You can hit below endpoints to see the output:

GET http://localhost:8080/movies

DELETE http://localhost:8080/movies/The Matrix

This is it for now.

References:-

Hello friends!!! Here we are going to discuss Spring Boot with NoSQL, how Spring Boot provide the support for NoSQL technologies and how to use into Spring Boot Application. NoSQL is a non-relational database management systems, different from traditional relational database management systems in some significant ways.

NoSQL is nothing but it is database without support of SQL queries unlike traditional databases MySQL, DB2, Oracle etc. Spring Data provides additional projects that help you access a variety of NoSQL technologies including MongoDB, Neo4J, Elasticsearch, Solr, Redis, Gemfire, Couchbase and Cassandra. Spring Boot provides auto-configuration for Redis, MongoDB, Neo4j, Elasticsearch, Solr and Cassandra.

Spring Boot with NoSQL

1. MongoDB

MongoDB is an open-source NoSQL document database that uses a JSON-like schema instead of traditional table-based relational data. Spring Boot offers several conveniences for working with MongoDB, including the spring-boot-starter-data-mongodb ‘Starter’. Spring Data includes repository support for MongoDB.

Spring Boot offers auto-configuration for Embedded Mongo. To use it in your Spring Boot application add a dependency on de.flapdoodle.embed:de.flapdoodle.embed.mongo. The port that Mongo will listen on can be configured using the spring.data.mongodb.port property. To use a randomly allocated free port use a value of zero. The MongoClient created by MongoAutoConfiguration will be automatically configured to use the randomly allocated port.

1.1 Connecting to a MongoDB database

Spring Data Mongo provides a MongoTemplate class that is very similar in its design to Spring’s JdbcTemplate. As with JdbcTemplate Spring Boot auto-configures a bean for you to simply inject:

For MongoDB Full Example Click Here

2. Neo4j

Neo4j is an open-source NoSQL graph database that uses a rich data model of nodes related by first class relationships which is better suited for connected big data than traditional rdbms approaches. Spring Boot offers several conveniences for working with Neo4j, including the spring-boot-starter-data-neo4j ‘Starter’.

You can configure the user and credentials to use via the spring.data.neo4j.* properties:

2.1 Connecting to a Neo4j database

By default the instance will attempt to connect to a Neo4j server using localhost:7474

2.2 Using the embedded mode

Reactive

If you add org.neo4j:neo4j-ogm-embedded-driver to the dependencies of your application, Spring Boot will automatically configure an in-process embedded instance of Neo4j that will not persist any data when your application shuts down. You can explicitly disable that mode using spring.data.neo4j.embedded.enabled=false.

2.3 Spring Data Neo4j repositories

Spring Data includes repository support for Neo4j. You can customize entity scanning locations using the @NodeEntityScan annotation.

3. Redis

Redis is a cache, message broker and richly-featured key-value store. Spring Boot offers basic auto-configuration for the Jedis client library and abstractions on top of it provided by Spring Data Redis. There is a spring-boot-starter-data-redis ‘Starter’ for collecting the dependencies in a convenient way.

Spring Data Neo4j Reactive

You can inject an auto-configured RedisConnectionFactory, StringRedisTemplate or vanilla RedisTemplate instance as you would any other Spring Bean. By default the instance will attempt to connect to a Redis server using localhost:6379.

4. Gemfire

Spring Data Gemfire provides convenient Spring-friendly tools for accessing the Pivotal Gemfire data management platform. There is a spring-boot-starter-data-gemfire ‘Starter’ for collecting the dependencies in a convenient way. There is currently no auto-configuration support for Gemfire, but you can enable Spring Data Repositories with a single annotation (@EnableGemfireRepositories).

5. Solr

Apache Solr is a search engine. Spring Boot offers basic auto-configuration for the Solr 5 client library and abstractions on top of it provided by Spring Data Solr. There is a spring-boot-starter-data-solr ‘Starter’ for collecting the dependencies in a convenient way.

You can inject an auto-configured SolrClient instance as you would any other Spring bean. By default the instance will attempt to connect to a server using localhost:8983/solr:

5.1 Spring Data Solr repositories

Spring Data includes repository support for Apache Solr.

Spring Reactive Neo4j Group

6. Elasticsearch

Elasticsearch is an open source, distributed, real-time search and analytics engine. Spring Boot offers basic auto-configuration for the Elasticsearch and abstractions on top of it provided by Spring Data Elasticsearch. There is a spring-boot-starter-data-elasticsearch ‘Starter’ for collecting the dependencies in a convenient way. Spring Boot also supports Jest.

6.1 Connecting to Elasticsearch using Spring Data

You can inject an auto-configured ElasticsearchTemplate or Elasticsearch Client instance as you would any other Spring Bean. By default the instance will embed a local in-memory server (a Node in Elasticsearch terms) and use the current working directory as the home directory for the server.
you can switch to a remote server by setting spring.data.elasticsearch.cluster-nodes to a comma-separated ‘host:port’ list.

Spring Data includes repository support for Elasticsearch.

6.2 Connecting to Elasticsearch using Jest

If you have Jest on the classpath, you can inject an auto-configured JestClient targeting localhost:9200 by default.

7. Cassandra

Cassandra is an open source, distributed database management system designed to handle large amounts of data across many commodity servers. Spring Boot offers auto-configuration for Cassandra and abstractions on top of it provided by Spring Data Cassandra. There is a spring-boot-starter-data-cassandra ‘Starter’ for collecting the dependencies in a convenient way.

7.1 Connecting to Cassandra

You can inject an auto-configured CassandraTemplate or a Cassandra Session instance as you would with any other Spring Bean. The spring.data.cassandra.* properties can be used to customize the connection.

Spring Data Neo4j Example

8. Couchbase

Couchbase is an open-source, distributed multi-model NoSQL document-oriented database that is optimized for interactive applications. Spring Boot offers auto-configuration for Couchbase and abstractions on top of it provided by Spring Data Couchbase. There is a spring-boot-starter-data-couchbase ‘Starter’ for collecting the dependencies in a convenient way.

Neo4j

The spring.couchbase.* properties can be used to customize the connection. Generally you will provide the bootstrap hosts, bucket name and password:

Spring Data includes repository support for Couchbase. ou can inject an auto-configured CouchbaseTemplate instance.

Summary

Here we have discussed some detail about NoSQL database with Spring Boot. Spring Boot Provide major support and auto configuration for connect to NoSQl databases.

Happy Spring Boot Learning!!!

Reference
http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/

Spring Boot Related Topics

Neo4j Application

  1. Introduction to Spring Boot