ps-conecta-firebird/src/main.ts

import {
  Database,
  ISOLATION_READ_COMMITTED,
  Options,
  attach,
} from "node-firebird";
import { Config } from "./index";

export class FirebirdConnection {
  private dataConnection: Options;
  constructor(private readonly options: Config) {
    const connection: Options = {
      host: this.options.host,
      port: this.options.port,
      database: this.options.database,
      user: this.options.user,
      password: this.options.password,
      lowercase_keys: this.options.lowercase_keys,
      role: this.options.role,
      pageSize: this.options.pageSize,
      retryConnectionInterval: this.options.retryConnectionInterval,
    };
    this.dataConnection = connection;
  }

  async queryExecute<T>(query: string, params = []): Promise<Array<T>> {
    return new Promise((resolve, reject) => {
      attach(this.dataConnection, function (err: any, db: Database) {
        if (err) {
          console.log("Um erro ocorreu na conexão do banco!", err);
          reject(err);
        } else {
          db.transaction(ISOLATION_READ_COMMITTED, (err, transaction) => {
            if (err) {
              console.log("Um erro ocorreu na transaction!", err);
              transaction.rollback();
              db.detach();
              reject(err);
            }
            transaction.query(query, params, (err: any, result: any[]) => {
              if (err) {
                console.log("Um erro ocorreu na query!", err);
                transaction.rollback();
                db.detach();
                reject(err);
              } else {
                transaction.commit();
                db.detach();
                resolve(result);
              }
            });
          });
        }
      });
    });
  }
}