nestjs连接并操作mongodb数据库

痛定思痛。 2022-12-05 05:24 361阅读 0赞

## 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();
        }
    }

## 浏览器测试请求 ##

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