1.创建项目

1.1 创建项目

输入命令

nest new blog-server

选择包管理器,我选的npm,习惯了

2.搭建路由

2.1 创建模块

nest g module users
nest g controller users
nest g service users

一定要按照顺序来，nest会自动创建文件并把各个模块自动引入

app.module.ts

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { UsersModule } from './users/users.module';@Module({imports: [UsersModule],controllers: [AppController],providers: [AppService],
})
export class AppModule {}

users.module.ts

import { Module } from '@nestjs/common';
import { UsersController } from './users.controller';
import { UsersService } from './users.service';@Module({controllers: [UsersController],providers: [UsersService]
})
export class UsersModule {}

2.2 安装依赖

安装数据库的依赖

npm install @nestjs/typeorm typeorm mysql2

其中mysql2根据自己的数据库来安装,其他可见官网 https://nestjs.bootcss.com/techniques/sql

3. 配置数据库

1. 配置数据库

创建一个文件放在根目录，ormconfig.ts
nestjs在运行的时候会先去这个文件

ormconfig.json

{"type": "mysql","host": "localhost","port": 3306,"username": "root","password": "123456","database": "blog_server","entities": ["dist/**/*.entity{.ts,.js}"],"synchronize": true
}// 其中synchronize，设置为true，是因为现在是生产环境，项目刚搭建，数据库可能会有更改，如此会方便一点，这个属性的意思是可以同步数据库，如果实例文件里面删除了某个属性，数据库会同步删除，正式环境会很危险，值得注意。

这个是mysql的配置文件，其他的看官网

引入app.module.ts文件

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { UsersModule } from './users/users.module';@Module({imports: [    TypeOrmModule.forRoot(),UsersModule],controllers: [AppController],providers: [AppService],
})
export class AppModule {}

4. 启动项目

查看package.json

{"name": "blog-server","version": "0.0.1","description": "","author": "","private": true,"license": "UNLICENSED","scripts": {"prebuild": "rimraf dist","build": "nest build","format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"","start": "nest start","start:dev": "nest start --watch","start:debug": "nest start --debug --watch","start:prod": "node dist/main","lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix","test": "jest","test:watch": "jest --watch","test:cov": "jest --coverage","test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand","test:e2e": "jest --config ./test/jest-e2e.json"},"dependencies": {"@nestjs/common": "^8.0.0","@nestjs/core": "^8.0.0","@nestjs/platform-express": "^8.0.0","reflect-metadata": "^0.1.13","rimraf": "^3.0.2","rxjs": "^7.2.0"},"devDependencies": {"@nestjs/cli": "^8.0.0","@nestjs/schematics": "^8.0.0","@nestjs/testing": "^8.0.0","@types/express": "^4.17.13","@types/jest": "27.0.2","@types/node": "^16.0.0","@types/supertest": "^2.0.11","@typescript-eslint/eslint-plugin": "^5.0.0","@typescript-eslint/parser": "^5.0.0","eslint": "^8.0.1","eslint-config-prettier": "^8.3.0","eslint-plugin-prettier": "^4.0.0","jest": "^27.2.5","prettier": "^2.3.2","source-map-support": "^0.5.20","supertest": "^6.1.3","ts-jest": "^27.0.3","ts-loader": "^9.2.3","ts-node": "^10.0.0","tsconfig-paths": "^3.10.1","typescript": "^4.3.5"},"jest": {"moduleFileExtensions": ["js","json","ts"],"rootDir": "src","testRegex": ".*\\.spec\\.ts$","transform": {"^.+\\.(t|j)s$": "ts-jest"},"collectCoverageFrom": ["**/*.(t|j)s"],"coverageDirectory": "../coverage","testEnvironment": "node"}
}

其中运行 start:dev ，这样修改代码时服务会自动重启

npm run start:dev

5. 创建实例

1. 创建用户实例表

在users文件夹下创建user.entity.ts

import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';@Entity()
export class User {@PrimaryGeneratedColumn()uid: number;@Column()nickname: string;@Column()mobile_number: string;@Column()email: string;@Column()password: string;
}

创建一个用户实体

导入users.module.ts

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { UsersController } from './users.controller';
import { UsersService } from './users.service';
import { User } from './user.entity';@Module({imports: [TypeOrmModule.forFeature([User])],controllers: [UsersController],providers: [UsersService],
})
export class UsersModule {}

服务自动重启或者重新启动服务，这样你就可以在你的数据库中看到user表

2. 添加校验

安装依赖

npm install class-validator class-transformer

在user文件夹下创建文件夹dtos，添加文件create-user.dto.ts
create-user.dto.ts

import { IsEmail, IsString } from 'class-validator';export class CreateUserDto {@IsString()nickname: string;@IsNumber()mobile_number: string;@IsEmail()email: string;@IsString()password: string;
}

在main.ts中添加白名单

main.ts

import { NestFactory } from '@nestjs/core';
import { ValidationPipe } from '@nestjs/common';
import { AppModule } from './app.module';async function bootstrap() {const app = await NestFactory.create(AppModule);app.useGlobalPipes(new ValidationPipe({whitelist: true,}),);await app.listen(3000);
}
bootstrap();

配置接口路由

users.controller.ts

import { Body, Controller, Post } from '@nestjs/common';
import { CreateUserDto } from './dtos/create-user.dto';@Controller('auth')
export class UsersController {@Post('/signup')createUser(@Body() body: CreateUserDto) {console.log(body);}
}

在POSTMAN中调用接口测试

3. 连接数据库存储数据

配置users.service.ts 创建create方法

users.service.ts

import { Injectable } from '@nestjs/common';
import { Repository } from 'typeorm';
import { InjectRepository } from '@nestjs/typeorm';
import { User } from './user.entity';
@Injectable()
export class UsersService {constructor(@InjectRepository(User) private repo: Repository<User>) {}create(nickname: string,mobile_number: string,email: string,password: string,) {const user = this.repo.create({ nickname, mobile_number, email, password });return this.repo.save(user);}
}

controller引用