Nodejs version of orm library--sequelize

This article will take you through the nodejs database orm extension-sequelize. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

sequelizeis the nodejs version of the ORM library. Those who have used laravelORMcan get started quickly

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Specific documentation

• Official website
• ##github

Simple code demo

const { Sequelize, DataTypes, Model, QueryTypes, Op } = require("sequelize"); const sequelize = new Sequelize("sqlite://sql.db", { logging: false }); class User extends Model {} class Address extends Model {} User.init( { // 在这里定义模型属性 id: { type: DataTypes.INTEGER, primaryKey: true, autoIncrement: true, }, name: { type: DataTypes.STRING, unique: true, // allowNull 默认为 true validate: { async isUnique(name) { const res = await User.findOne({where: {name}}) if (res) throw new Error('用户名已存在') }, // len: [1,2] } }, }, { // 这是其他模型参数 sequelize, // 我们需要传递连接实例 // modelName: "User", // 我们需要选择模型名称 tableName:'users' // 表名，默认为模型名的复数单词 } ); Address.init( { id: { type: DataTypes.INTEGER, primaryKey: true, autoIncrement: true, }, name: { type: DataTypes.STRING, unique: true, // allowNull 默认为 true }, }, { sequelize, modelName: "Address", } ); // 模型关系 多对多 User.belongsToMany(Address, { through: "userAddress", as:'addres' }); // through 代表中间表的名字，as是查询别名 Address.belongsToMany(User, { through: "userAddress" }); (async () => { try { // await sequelize.sync({ alter: true }); // 同步模型到数据库-创建表 // const user = await User.findOne({ where: { name: {[Op.like]:'%小%'} } }); // 基本查询 const [user] = await User.findOrCreate({where:{name:'小小'},include:'addres'}); // 顺带查询到关联模型的数据 const [address] = await Address.findOrCreate({where:{name:'小小de地址'}}); await user.addAddress(address); // 关联增加 console.log(user.toJSON()); } catch (e) { console.log(e); } })();

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