nestjs连接并操作mongodb数据库

安装nestjs/mongoose 以及mongoose模块

cnpm install --save @nestjs/mongoose mongoose

配置数据库连接地址

在app.module.ts中配置数据库连接

import {
      AppController } from './modules/app/app.controller';
import {
      StudentsModule } from './modules/students/students.module';

@Module({
     
  imports:[MongooseModule.forRoot('mongodb://127.0.0.1:27017/students', {
     useNewUrlParser: true})]
})
export class AppModule {
     }

配置Schema

配置schema需要和数据库字段对应，用来操作数据库

import * as mongoose from 'mongoose';

export const StudentsSchema = new mongoose.Schema({
     
    name: String,
    age: Number,
    sex: String
})

在使用的控制器对应的Module中配置Model

import {
      Module } from '@nestjs/common';
import {
      StudentsController } from './students.controller';
import {
      MongooseModule } from '@nestjs/mongoose';
import {
      StudentsSchema } from 'src/schema/students.schema'; // 定义的schema模型
import {
      StudentsService } from './students.service';

@Module({
     
  imports: [MongooseModule.forFeature([
    {
     
      name: 'Students', // 需要个schema名称对应
      schema: StudentsSchema, // 引入的schema
      collection: 'students' // 数据库名称
    }
  ])],
  controllers: [StudentsController],
  providers: [StudentsService]
})
export class StudentsModule {
     }

定义服务操作数据库

import {
      Injectable } from '@nestjs/common';
import {
      InjectModel } from '@nestjs/mongoose';
 
@Injectable()
export class StudentsService {
     
    constructor(
        @InjectModel('Students') private readonly studentsModel
    ) {
     }

    async studentsInfo() {
     
        return await this.studentsModel.find().exec();
    }
}

在对应的控制器中调用服务

import {
      Controller, Get } from '@nestjs/common';
import {
      StudentsService } from './students.service';

@Controller('students')
export class StudentsController {
     

    constructor(private readonly studentsService: StudentsService) {
     }

    @Get()
    index() {
     
        return this.studentsService.studentsInfo();
    }
}

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