nodejs使用Sequelize框架操做数据库

sequelize.define

使用该方法能够定义model，例子以下：html

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实际上是模型名，数据表默认是websites这样的复数形式，这种约定我在Laravel中也遇见过，也就是常说的，约定大于定义，也就是说，若是咱们都按照约定的规范去开发，那么效率其实比从新定义，要高不少。那么，定义好了模型，该怎么进行使用呢？mysql

(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，经过建立一个class，这样能够使用model.exports=模块名的方式，将该模型封装起来。供别的地方使用，只须要require进去便可。web

具体如何对数据表进行操做，就比较简单了，只须要参考API便可。sequelize文档地址sql

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