BE/src/db/db.module.ts

import { Global, Module } from '@nestjs/common';
import { MssqlDBService, OracleDBService, PgDBService } from './db.service';

@Global()
@Module({
  providers: [OracleDBService, MssqlDBService, PgDBService],
  exports: [OracleDBService, MssqlDBService, PgDBService],
})
export class DbModule { }