如何在NodeJS中防止键重复

const keySet = new Set();

function isKeyDuplicate(key) {
  if (keySet.has(key)) {
    return true;
  } else {
    keySet.add(key);
    return false;
  }
}

const keyObj = {};

function isKeyDuplicate(key) {
  if (keyObj.hasOwnProperty(key)) {
    return true;
  } else {
    keyObj[key] = true;
    return false;
  }
}

const { Sequelize, DataTypes } = require('sequelize');

const sequelize = new Sequelize('database', 'username', 'password', {
  host: 'localhost',
  dialect: 'mysql'
});

const Model = sequelize.define('Model', {
  key: {
    type: DataTypes.STRING,
    unique: true // 添加唯一约束
  }
});

async function isKeyDuplicate(key) {
  try {
    await sequelize.sync();
    const result = await Model.findOne({ where: { key } });
    return result !== null;
  } catch (error) {
    console.error('Error:', error);
    return false;
  }
}