MySql 创建一些表，有些则不创建

Question

客户希望我们在他的电子商务网站上使用 Mysql，就像我们在后端所做的那样。目前我正在使用 mysql，当要部署时我们将迁移到某个提供商

这是我们如何初始化数据库的序列片段

const { Sequelize } = require("sequelize");

// Create a Sequelize instance
const sequelize = new Sequelize("[db_name]", "[username]", "[password]", {
  host: "localhost", // Replace with your MySQL host, e.g., '127.0.0.1'
  dialect: "mysql", // Choose the database dialect (MySQL in this case)
  port: 3306, // Default MySQL port is 3306

  // Pool configuration used to manage connections
  pool: {
    max: 5, // Maximum number of connection in pool
    min: 0, // Minimum number of connection in pool
    acquire: 30000, // Maximum time (ms) that pool will try to get connection before throwing error
    idle: 10000, // Maximum time (ms) that a connection can be idle before being released
  },

  // Optional logging configuration (can be a function or boolean)
  logging: false, // Set to 'console.log' to see SQL queries
});

// Test the connection
sequelize
  .authenticate()
  .then(() => {
    console.log("Connection has been established successfully.");
  })
  .catch((err) => {
    console.error("Unable to connect to the database:", err);
  });


module.exports = sequelize;

以前，我对硬编码插入某些模型中的偏好模型不感兴趣，只是为了制作模型并按应有的方式使用它们，但无论如何它都没有帮助，而且只有在某些模型中初始化的偏好模型没有创建

require("dotenv").config();
const sequelize = require("../config/database"); // Assuming you've created the Sequelize instance in config/database.js
const User = require("../models/user");
const Address = require("../models/address");
const Merchant = require("../models/merchant");
const Product = require("../models/product");
const Cart = require("../models/cart");
const CartItem = require("../models/cartitem");
const Order = require("../models/order");
const Review = require("../models/review");
const Wishlist = require("../models/wishlist");

const setupDB = async () => {
  try {
    // Test the MySQL connection using Sequelize
    await sequelize.authenticate();
    console.log("\x1b[32m%s\x1b[0m", "✓ MySQL Connected!"); // Green color for success message

    // Sync the models with the database
    await sequelize.sync({ alter: true }); // Change to { force: true } if you want to drop existing tables
    console.log("\x1b[32m%s\x1b[0m", "✓ Database tables synced!"); // Success message for syncing

    // Set up associations
    User.hasMany(Address, { foreignKey: "userId", as: "addresses" });
    Address.belongsTo(User, { foreignKey: "userId", as: "users" });

    Merchant.hasMany(Product, { foreignKey: "merchantId", as: "products" });
    Product.belongsTo(Merchant, { foreignKey: "merchantId", as: "merchants" });

    User.hasMany(Cart, { foreignKey: "userId", as: "carts" });
    Cart.belongsTo(User, { foreignKey: "userId", as: "users" });

    Cart.hasMany(CartItem, { foreignKey: "cartId", as: "items" });
    CartItem.belongsTo(Cart, { foreignKey: "cartId", as: "carts" });
    CartItem.belongsTo(Product, { foreignKey: "productId", as: "products" });

    User.hasMany(Order, { foreignKey: "userId", as: "orders" });
    Order.belongsTo(User, { foreignKey: "userId", as: "users" });
    Order.belongsTo(Cart, { foreignKey: "cartId", as: "carts" });

    Product.hasMany(Review, { foreignKey: "productId", as: "reviews" });
    Review.belongsTo(Product, { foreignKey: "productId", as: "products" });
    User.hasMany(Review, { foreignKey: "userId", as: "reviews" });
    Review.belongsTo(User, { foreignKey: "userId", as: "users" });

    User.hasMany(Wishlist, { foreignKey: "userId", as: "wishlists" });
    Wishlist.belongsTo(User, { foreignKey: "userId", as: "users" });
    Wishlist.belongsTo(Product, { foreignKey: "productId", as: "products" });
  } catch (error) {
    console.log(
      "\x1b[31m%s\x1b[0m",
      "✗ Unable to connect to the database:",
      error
    ); // Red color for error message
    return null;
  }
};

module.exports = setupDB;

我还需要一些帮助，因为我正在使用托管服务（我不想，但我的老板出于某种原因想使用托管服务）现在我想在线部署 mysql 数据库，那么我可以用它做什么？

Answer 1

如果您正在开发小型项目，请考虑使用 AWS。它提供 750 个免费小时，其成本效益使其成为绝佳选择。 AWS 链接