使用 Typeorm 连接到 Nestjs 中的 mssql，但 Nest 无法解析 EmployeeRepository 的依赖关系

Posted 2023-02-19

【中文标题】使用 Typeorm 连接到 Nestjs 中的 mssql，但 Nest 无法解析 EmployeeRepository 的依赖关系

【英文标题】：connect to mssql in Nestjs with Typeorm, but Nest can't resolve dependencies of the EmployeeRepository

【发布时间】：2021-08-27 04:48:36

【问题描述】：

我将 Nestjs 中的 mssql 与 Typeorm 连接并得到错误 Nest can't resolve dependencies of the EmployeeRepository

我的 app.module.ts 文件：

import  Module  from '@nestjs/common';
import  AppController  from './app.controller';
import  AppService  from './app.service';
import config from '../ormconfig';
import  TypeOrmModule  from '@nestjs/typeorm';
import  EmployeesModule  from './employees/employees.module';
@Module(
  imports: [
    TypeOrmModule.forRoot( ...config, autoLoadEntities: true ),
    EmployeesModule,
  ],
  controllers: [AppController],
  providers: [AppService],
)
export class AppModule 

ormconfig.ts 文件：

const config: SqlServerConnectionOptions = 
  type: 'mssql',
  host: 'localhost',
  port: 1433,
  username: 'sa',
  password: 'sa',
  database: 'db1',
  synchronize: false,
;

export default config;

employees.module.ts 文件：

import  Module  from '@nestjs/common';
import  TypeOrmModule  from '@nestjs/typeorm';
import  Employee  from './employee.entity';
import  EmployeesController  from './employees.controller';
import  EmployeesService  from './employees.service';
@Module(
  imports: [TypeOrmModule.forFeature([Employee])],
  providers: [EmployeesService],
  controllers: [EmployeesController],
)
export class EmployeesModule 

employees.service.ts 文件：

import  Injectable  from '@nestjs/common';
import  InjectRepository  from '@nestjs/typeorm';
import  Repository  from 'typeorm';
import  Employee  from './employee.entity';

@Injectable()
export class EmployeesService 
  constructor(
    @InjectRepository(Employee)
    private employeesRepository: Repository<Employee>,
  ) 

  findAll(): Promise<Employee[]> 
    return this.employeesRepository.find();
  

employee.entity.ts 文件：

import 
  Entity,
  PrimaryGeneratedColumn,
  Column,
  BaseEntity,
 from 'typeorm';

@Entity('Employees')
export class Employee extends BaseEntity 
  @PrimaryGeneratedColumn( type: 'int' )
  EmployeeID!: number;

  @Column( type: 'nvarchar', length: 50 )
  FirstName!: string;

  @Column( type: 'nvarchar', length: 50 )
  LastName!: string;
...

employees.controller.ts 文件只做 CLI 创建的准系统。在 mssql 的 db1 中有一个名为 Employees 的表。我只是无法弄清楚为什么会这样。我什至尝试删除 dist 和 node_modules，但没有运气。

我的 package.json 的主要部分

    "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": "^7.6.15",
    "@nestjs/core": "^7.6.15",
    "@nestjs/platform-express": "^7.6.15",
    "@nestjs/typeorm": "^7.1.5",
    "mssql": "^7.1.0",
    "reflect-metadata": "^0.1.13",
    "rimraf": "^3.0.2",
    "rxjs": "^6.6.6",
    "typeorm": "^0.2.34"
  ,
  "devDependencies": 
    "@nestjs/cli": "^7.6.0",
    "@nestjs/schematics": "^7.3.0",
    "@nestjs/testing": "^7.6.15",
    "@types/express": "^4.17.11",
    "@types/jest": "^26.0.22",
    "@types/node": "^14.14.36",
    "@types/supertest": "^2.0.10",
    "@typescript-eslint/eslint-plugin": "^4.19.0",
    "@typescript-eslint/parser": "^4.19.0",
    "eslint": "^7.22.0",
    "eslint-config-prettier": "^8.1.0",
    "eslint-plugin-prettier": "^3.3.1",
    "jest": "^26.6.3",
    "prettier": "^2.2.1",
    "supertest": "^6.1.3",
    "ts-jest": "^26.5.4",
    "ts-loader": "^8.0.18",
    "ts-node": "^9.1.1",
    "tsconfig-paths": "^3.9.0",
    "typescript": "^4.2.3"
  ,

【参考方案1】：

我建议在您的配置中添加实体路径，以便它可以找到文件：

  type: 'mssql',
  host: 'localhost',
  port: 1433,
  username: 'sa',
  password: 'sa',
  database: 'db1',
  entities: ["dist/**/*.entity.ts,.js"],
  synchronize: false,
;

文档：https://docs.nestjs.com/techniques/database#repository-pattern

【讨论】：

您好，我试过了，但遇到了同样的错误。我什至添加了 autoLoadEntities: true ，如我的 app.module 文件中所示，该文件受到 Nestjs 示例代码的启发。

抱歉无法重现您的问题，只是尝试了同样的方法，一切正常（即使没有实体选项）...您的库是最新的吗？

感谢您的回复，我在上面的问题中添加了package.json。我一周前开始了这个项目。所有的包都应该没问题。

你说得对，我从头开始。有用。我一定做了一些愚蠢的事情，我仍然不知道错误的原因。还是谢谢！