时间:2021-04-08 10:39:33 | 栏目:NodeJS | 点击:次
sequelize.define
使用该方法可以定义model,例子如下:
const Sequelize = require('sequelize'); var sequelize = new Sequelize(config.database, config.username, config.password, { host: config.host, dialect: 'mysql', pool: { max: 5, min: 0, idle: 30000 } }); var Website = sequelize.define('website', { id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true }, url: Sequelize.STRING(255), title: Sequelize.STRING(255), status: Sequelize.INTEGER, delete_mark: Sequelize.BOOLEAN }, { timestamps: false });
该方法传入的第一个参数是数据表的单数形式,怎么理解呢?例如这里传入的是website其实是模型名,数据表默认是websites这样的复数形式,这种约定我在Laravel中也碰见过,
也就是常说的,约定大于定义,也就是说,如果我们都按照约定的规范去开发,那么效率其实比重新定义,要高很多。
那么,定义好了模型,该怎么进行使用呢?
(async () => { let demo = await Website.create({ url:'http://www.xxxx.com/', title:'demo' }); console.log(demo); })();
继承Model
const {Sequelize, DataTypes, Model} = require('sequelize'); const config = require('../config'); const sequelize = new Sequelize(config.database, config.username, config.password, { host: config.host, dialect: 'mysql', pool: { max: 5, min: 0, idle: 30000 } }); /** * @author chaojilaji * 数据表websites的关系对象映射 */ class WebSite extends Model { } WebSite.init({ id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true }, url: Sequelize.STRING(255), title: Sequelize.STRING(255), status: Sequelize.INTEGER, delete_mark: Sequelize.BOOLEAN }, { sequelize, modelName: 'Website', timestamps:false }); (async () => { await sequelize.sync(); let x = await WebSite.create({ url: 'http://www.xxxxxxxx.com/', title: 'demo2' }); console.log(x); })(); module.exports = WebSite;
我比较推荐使用继承Model这种方式,通过创建一个class,这样可以使用model.exports=模块名的方式,将该模型封装起来。供别的地方使用,只需要require进去即可。
具体如何对数据表进行操作,就比较简单了,只需要参考API即可。 sequelize文档地址