/// modules/hospital/service.js
/// 描述：医院资源的业务逻辑层（所有 SQL 集中在这里）
const { getPool } = require('../../db');

/**
 * 列出所有医院
 * @returns {Promise<Array<object>>}
 */
const listAll = async () => {
  const [rows] = await getPool().query('SELECT * FROM hospitals ORDER BY id');
  return rows;
};

/**
 * 按 ID 获取医院
 * @param {string} id
 * @returns {Promise<object|null>}
 */
const findById = async (id) => {
  const [rows] = await getPool().query('SELECT * FROM hospitals WHERE id = ?', [id]);
  return rows[0] || null;
};

module.exports = { listAll, findById };