问错误: P1001:无法到达``localhost`‘：`5200’的数据库服务器

EN

prisma schema loaded from prisma/schema.prism
Datasource "db": PostgreSQL database "nestjs", schema "public" at "localhost:5200"
Error: P1001: Can't reach database server at `localhost`:`5200`
Please make sure your database server is running at `localhost`:`5200`

version: '3.7'
services:
  db:
    image: postgres:12.9
    ports:
      - 5200:5432
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: 123
      POSTGRES_DB: nestjs
    volumes:
      - database-data:/var/lib/postgresql/data
    networks:
      - sai
    restart: always

  test:
    container_name: test
    image: test
    build:
      context: .
      target: development
      dockerfile: Dockerfile
    command: npm run start:prod
    ports:
      - 3000:3000
      - 9229:9229
    networks:
      - sai
    volumes:
      - .:/usr/src/app
      - /usr/src/app/node_modules
    links:
      - db
    depends_on:
      - db
    restart: always

networks:
  sai:
    driver: bridge

volumes:
  database-data:

FROM node:latest as development
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install --only=development
COPY . .
RUN npm run build


FROM node:latest as production
ARG NODE_ENV=production
ENV NODE_ENV=${NODE_ENV}
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install --only=production
COPY . .
COPY --from=development /usr/src/app/prisma ./prisma
COPY --from=development /usr/src/app/dist ./dist
EXPOSE 3000
CMD npm run start:prod

...
  "generate:prisma": "npx prisma migrate dev --name init",
  "start:prod": "npm run generate:prisma && npm run dist/main",
...