Nest Neo4j

Neo4j integration for Nest

Description

This repository provides Neo4j integration for Nest.

Installation

$ npm i --save nest-neo4j

Quick Start

Register the Neo4j Module in your application using the forRoot method, passing the neo4j connection information as an object:

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { Neo4jModule } from 'nest-neo4j'

@Module({
  imports: [
    Neo4jModule.forRoot({
      scheme: 'neo4j',
      host: 'localhost',
      port: 7687,
      username: 'neo4j',
      password: 'neo'
    })
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

Querying Neo4j

The Neo4jService is @Injectable, so can be passed into any constructor:

import { Neo4jService } from 'nest-neo4j'

@Controller()
export class AppController {
  constructor(private readonly appService: AppService,
    private readonly neo4jService: Neo4jService
    ) {}

  @Get()
  async getHello(): Promise<any> {
    const res = await this.neo4jService.read(`MATCH (n) RETURN count(n) AS count`)

    return `There are ${res.records[0].get('count')} nodes in the database`
  }
}

Methods

getConfig(): Neo4jConnection;
getReadSession(database?: string): Session;
getWriteSession(database?: string): Session;
read(query: string, params?: object, database?: string): Result;
write(query: string, params?: object, database?: string): Result;

More Information

For more information about running Neo4j in your Node.js or TypeScript project, check out Neo4j GraphAcademy.