Sequelize

使用方法：

$ npm install @midwayjs/sequelize -S

安装数据库 Driver

常用数据库驱动如下，选择你对应连接的数据库类型安装：

# for MySQL or MariaDB，也可以使用 mysql2 替代npm install mysql --savenpm install mysql2 --save
# for PostgreSQL or CockroachDBnpm install pg --save
# for SQLitenpm install sqlite3 --save
# for Microsoft SQL Servernpm install mssql --save
# for sql.jsnpm install sql.js --save
# for Oraclenpm install oracledb --save
# for MongoDB(experimental)npm install mongodb --save

引入模块

在 configuration.ts 文件中

import { App, Configuration } from '@midwayjs/decorator';import { ILifeCycle } from '@midwayjs/core';import { Application } from 'egg';import { join } from 'path';import * as sequlize from '@midwayjs/sequelize';
@Configuration({  imports: [sequlize],  importConfigs: [join(__dirname, './config')],})export class ContainerLifeCycle implements ILifeCycle {  @App()  app: Application;
  async onReady() {}}

配置

在 config.default.ts 中配置：

export const sequelize = {  options: {    database: 'test4',    username: 'root',    password: '123456',    host: '127.0.0.1', // 此处支持idb上面vipserver key的那种方式，也支持aliyun的地址。    port: 3306,    encrypt: false,    dialect: 'mysql',    define: { charset: 'utf8' },    timezone: '+08:00',    logging: console.log,  },  sync: false, // 本地的时候，可以通过sync: true直接createTable};

业务层

定义 Entity

import { Column, Model } from 'sequelize-typescript';import { BaseTable } from '@midwayjs/sequelize';
@BaseTableexport class Photo extends Model {  @Column({    comment: '名字',  })  name: string;}

使用 Entity: ​

查询列表

import { Config, Controller, Get, Provide } from '@midwayjs/decorator';import { Photo } from '../entity/Photo';
@Provide()@Controller('/')export class HomeController {  @Get('/')  async home() {    let result = await Photo.findAll();    console.log(result);    return 'hello world';  }}

增加数据：

import { Config, Controller, Get, Provide } from '@midwayjs/decorator';import { Photo } from '../entity/Photo';
@Provide()@Controller('/')export class HomeController {  @Post('/add')  async home() {    let result = await Photo.create({      name: '123',    });    console.log(result);    return 'hello world';  }}

删除：

import { Config, Controller, Get, Provide } from '@midwayjs/decorator';import { Photo } from '../entity/Photo';
@Provide()@Controller('/')export class HomeController {  @Post('/delete')  async home() {    await UserModel.destroy({      where: {        name: '123',      },    });    return 'hello world';  }}

查找单个：

import { Config, Controller, Get, Provide } from '@midwayjs/decorator';import { Photo } from '../entity/Photo';
@Provide()@Controller('/')export class HomeController {  @Post('/delete')  async home() {    let result = await UserModel.findOne({      where: {        name: '123',      },    });    return 'hello world';  }}

联合查询：

import { Config, Controller, Get, Provide } from '@midwayjs/decorator';import { Photo } from '../entity/Photo';import { Op } from 'sequelize';
@Provide()@Controller('/')export class HomeController {  @Get('/')  async home() {    let result = await Photo.findAll({      where: {        [Op.or]: [{ name: '23' }, { name: '34' }], // SELECT * FROM photo WHERE name = "23" OR name = "34";      },    });    console.log(result);    return 'hello world';  }}

关于 OP 的更多用法：https://sequelize.org/v5/manual/querying.html ​

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如果遇到比较复杂的，可以使用 raw query 方法： https://sequelize.org/v5/manual/raw-queries.html