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
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