Init Nest-Neo4j

Nest/src/neo4j/neo4j.service.ts

@@ -0,0 +1,44 @@
+import { Inject, Injectable } from '@nestjs/common';
+import neo4j, { Driver, Result } from 'neo4j-driver';
+import { Neo4jConfig } from './neo4j-cfg.interface';
+import { NEO4J_CONFIG, NEO4J_DRIVER } from './neo4j.constans';
+
+@Injectable()
+export class Neo4jService {
+  constructor(
+    @Inject(NEO4J_CONFIG) private readonly config: Neo4jConfig,
+    @Inject(NEO4J_DRIVER) private readonly driver: Driver,
+  ) {}
+
+  getDriver(): Driver {
+    return this.driver;
+  }
+
+  getConfig(): Neo4jConfig {
+    return this.config;
+  }
+
+  getReadSession(database?: string) {
+    return this.driver.session({
+      database: database || this.config.database,
+      defaultAccessMode: neo4j.session.READ,
+    });
+  }
+
+  getWriteSession(database?: string) {
+    return this.driver.session({
+      database: database || this.config.database,
+      defaultAccessMode: neo4j.session.WRITE,
+    });
+  }
+
+  read(cypher: string, params: Record<string, any>, database?: string): Result {
+    const session = this.getReadSession(database);
+    return session.run(cypher, params);
+  }
+
+  write(cypher: string, params: Record<string, any>, database?: string): Result {
+    const session = this.getWriteSession(database);
+    return session.run(cypher, params);
+  }
+}