如何使用Nest.js + TypeORM创建基本服务类？

npm install -g @nestjs/cli

nest new project-name

cd project-name

npm install --save @nestjs/typeorm typeorm mysql

nest generate service example

import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';

@Entity()
export class ExampleEntity {
  @PrimaryGeneratedColumn()
  id: number;

  @Column()
  name: string;

  // 其他属性和关系...
}

import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { ExampleEntity } from './example.entity';

@Injectable()
export class ExampleService {
  constructor(
    @InjectRepository(ExampleEntity)
    private exampleRepository: Repository<ExampleEntity>,
  ) {}

  async findAll(): Promise<ExampleEntity[]> {
    return this.exampleRepository.find();
  }

  async create(example: ExampleEntity): Promise<ExampleEntity> {
    return this.exampleRepository.save(example);
  }

  // 其他方法...
}

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { ExampleService } from './example.service';
import { ExampleEntity } from './example.entity';

@Module({
  imports: [TypeOrmModule.forFeature([ExampleEntity])],
  providers: [ExampleService],
  exports: [ExampleService],
})
export class ExampleModule {}

import { Controller, Get } from '@nestjs/common';
import { ExampleService } from './example.service';
import { ExampleEntity } from './example.entity';

@Controller('example')
export class ExampleController {
  constructor(private exampleService: ExampleService) {}

  @Get()
  async findAll(): Promise<ExampleEntity[]> {
    return this.exampleService.findAll();
  }

  // 其他路由和方法...
}