node.js访问mysql

安装模块sequelize和mysql2

1.config.js

var config = {
    database: 'mysql',
    username: 'username',
    password: '*****',
    host: 'localhost',
    port: 3306
};

module.exports = config;

2.app.js

const Sequelize = require('sequelize');
const config = require('./config');


var sequelize = new Sequelize(config.database, config.username, config.password, {
    host: config.host,
    dialect: 'mysql',
    pool: {
        max: 6,
        min: 0,
        idle: 50000
    }
});

//定义一个序列号模型，对应于mysql数据库中的pets表，字段要一致
var Pet = sequelize.define('pet', {
    id: {
        type: Sequelize.STRING(50),
        primaryKey: true
    },
    name: Sequelize.STRING(100),
    gender: Sequelize.BOOLEAN,
    birth: Sequelize.STRING(10),
    createdAt: Sequelize.BIGINT,
    updatedAt: Sequelize.BIGINT,
    version: Sequelize.BIGINT
}, {
    timestamps: false
});

var now = Date.now();

//使用promise方式插入一条记录
Pet.create({
    id: 'g-' + now,
    name: 'Gaffey',
    gender: false,
    birth: '2018-07-07',
    createdAt: now,
    updatedAt: now,
    version: 0
}).then(function (p) {
    console.log('created.' + JSON.stringify(p));
}).catch(function (err) {
    console.log('failed: ' + err);
});

//使用await方式插入一条记录
(async () => {
    var dog = await Pet.create({
        id: 'd-' + now,
        name: 'Odie',
        gender: false,
        birth: '2019-03-08',
        createdAt: now,
        updatedAt: now,
        version: 0
    });
    console.log('created: ' + JSON.stringify(dog));
})();

//查询数据
(async () => {
    var pets = await Pet.findAll({
        where: {
            name: 'Gaffey'
        }
    });
    console.log(`find ${pets.length} pets:`);
    for (let p of pets) {
        console.log(JSON.stringify(p));
        console.log('update pet...');
        p.gender = true;
        p.updatedAt = Date.now();
        p.version ++;
        await p.save();               //更新数据
        if (p.version === 3) {
            await p.destroy();        //删除数据
            console.log(`${p.name} was destroyed.`);
        }
    }
})();