Nest js mongoose 日志连接事件

Question

我在 express 中做了类似的事情来记录 mongodb 连接事件。

mongoose
  .connect(process.env.DATABASE, {
    useNewUrlParser: true,
    useFindAndModify: false
  })
  .then(() => console.log('connect to DB successfully :)'));

mongoose.connection.on('error', err => {
  console.log('DB connection failed');
});

mongoose.connection.on('disconnected', () => {
  console.log('DB disconnected');
});

mongoose.connection.on('reconnected', () => {
  console.log('DB reconnected');
});

我想要 Nest js 中的类似功能，但我做不到。这是我连接到 mongodb.

的嵌套 js 代码

import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { MongooseModule } from '@nestjs/mongoose';
import { AppController } from './app.controller';
import { AppService } from './app.service';

@Module({
  controllers: [AppController],
  providers: [AppService],
  imports: [
    MongooseModule.forRootAsync({
      imports: [ConfigModule],
      useFactory: async (configService: ConfigService) => ({
        uri: configService.get<string>('dbConnectionString'),
        user: configService.get<string>('DB_USER'),
        pass: configService.get<string>('DB_PASS')
      }),
      inject: [ConfigService]
    })
  ]
})
export class AppModule {}

Answer 1

终于找到答案了。我应该使用 InjectConnection.

@Injectable()
export class AppService {
  constructor(@InjectConnection() private connection: Connection) {
    this.connection.on('disconnected', () => {
      console.log('DB disconnected');
    });
  }
}

Answer 2

您可以在 app.module.ts 文件中监控 NestJS mongodb 连接，同时通过 url 连接 mongodb。

    MongooseModule.forRoot(dbURL, {
      connectionFactory: (connection) => {
        connection.on('connected', () => {
           console.log('is connected');
        });
        connection.on('disconnected', () => {
           console.log('DB disconnected');
        });
        connection.on('error', (error) => {
           console.log('DB connection failed! for error: ', error);
        });
        return connection;
        },
      },
    ),

https://docs.nestjs.com/techniques/mongodb

Nest js mongoose 日志连接事件

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