Sequelize操作数据库（包括模型，增，删改)

Posted 2023-02-28 嘴巴嘟嘟

// Using NPM
$ npm install --save sequelize
// 使用哪种数据库选择不同的安装
$ npm install --save mysql2

连接数据库的配置
1、dbUrl.js

const dbUrl = 
    host: 'localhost',
    user: 'root',
    password: 'root',
    database: 'realworld',
    dialect: 'mysql'  

module.exports = dbUrl

const Sequelize = require('sequelize');
const dbUrl = require('../config/config.default')
// database数据库名称   name 用户  password密码

const sequelize = new Sequelize(
    dbUrl.database,
    dbUrl.user,
    dbUrl.password,
    
        host: dbUrl.host,  //数据库域名
        dialect:dbUrl.dialect,
        // 设置时区
        timezon: '+08:00',
        define: 
            timestamps: false //为模型添加 createdAt 和 updatedAt 两个时间戳字段（true or false）
        ,
        pool: 
            max: 5,
            min: 0,
            idle: 10000
        
    );
sequelize
    .authenticate()
    .then(() => 
        console.log('Connection has been established successfully.');
    )
    .catch(err => 
        console.error('Unable to connect to the database:', err);
    );


module.exports = sequelize

运行项目 显示连接成功
定义mode

const users = db.define('t_user'/*自定义表名*/, 
    id: 
        type: Sequelize.INTEGER,
        primaryKey: true,       //主键
        autoIncrement: true,    //自增
        comment: "自增id"       //注释:只在代码中有效
    ,
    //用户名
    username: 
        type: Sequelize.STRING,
        validate:
	        isEmail: true,   //类型检测,是否是邮箱格式
        
    ,
    //密码
    pwd: 
        type: Sequelize.STRING(10),
        allowNull: false,//不允许为null
    ,
    //状态
    status: 
        type: Sequelize.INTEGER,
         defaultValue: 0,//默认值是0
    ,
    //昵称
    nickname: 
        type: Sequelize.STRING
    ,
    //token
    token: 
        type: Sequelize.UUID
    ,
    create_time: 
        type: Sequelize.DATE,
        defaultValue: Sequelize.NOW
    
, 
    //使用自定义表名
    freezeTableName: true,
    //去掉默认的添加时间和更新时间
    timestamps: false,
    indexes:[
	    //普通索引,默认BTREE
        
            unique: true,
            fields: ['pid']
        ,
     ]
);

//同步:没有就新建,有就不变
// users.sync();
//先删除后同步
users.sync(
    force: true
);

单表的增删改
增

let user = UsersModel.build(
   username: "swnd",
   password: "q11111"
);
user = await user.save();
console.log(user.get('id': 3));

改

const hasUser = await UsersModel.findOne(
  where: 
    id: 6,
    username: 'zhangsan'
  
);
hasUser.username = 'wanggangdan'
hasUser.save();

删

const hasUser = await UsersModel.findOne(
  where: 
    id: 3
  
);
await hasUser.destroy();