how to check if database connected? about nest-drizzle HOT 2 CLOSED

async getDrizzle() {
  let client: postgres.Sql<Record<string, never>>;

  if (!this._drizzle) {
    client = postgres(this._NestDrizzleOptions.url);
    try {
      await client`SELECT 1`; // Sending a test query to check connection
      this.logger.log('Database connected successfully');
    } catch (error) {
      this.logger.error('Database connection error', error);
      throw error; // Propagate the error
    }
    this._drizzle = drizzlePgJs(client, this._NestDrizzleOptions.options);
  }
  return this._drizzle;
}