docker 安装postgres，nodejs连接pg

docker 安装postgres，nodejs连接pg

docker pull Postgres
docker image ls
docker pull dpage/pgadmin4
docker volume create postgres-volume
docker run -d -p 5432:5432 —name postresql -v Postgres-volume:/var/lib/portgresql/data -e POSTGRES_PASSWORD=portgresPW postgres
docker run -d -p 5433:80 —name pgadmin4 -e PGADMIN_DEFAULT_EMAIL=test@qq.com -e PGADMIN_DEFAULT_PASSWORD=123456 dpage/pgadmin4

数据库管理后台访问pgadmin4：
http://localhost:5433
用户名：test@qq.com
密码：123456
连接数据库

主机名：host.docker.internal（默认）
用户名：portgres(默认)
密码：portgresPW

pnpm install pg config

config/default.json

{
  "db":{
      "user": "postgres",
      "host": "127.0.0.1",
      "database": "postgres",
      "password": "pass123",
      "port": "5432"
  }
}

index.js

import pg from "pg"
import config from "config"
const { Client } = pg
const dbConfig = config.db
const pgClient = new Client(dbConfig)
//1.连接到数据库
pgClient.connect((connectErr) => {
  if (connectErr) {
    console.error(connectErr,"连接失败")
    return
  }
  console.log("连接成功")
//2.执行查询
pgClient.query('SELECT * from tbl_user where username = $1', ['testuser'], (queryErr, res) => {
    if (!queryErr) {
      console.log(res.rows[0])
    } else {
      console.error(queryErr,"查询失败")
    }
//3.关闭连接
    pgClient.end((endErr) => {
      if (endErr) {
        console.error(err,"关闭连接失败")
      }else{
        console.log("关闭连接")
      }
    })
  })
})

package.json

{
	"name": "postgres-demo",
	"version": "1.0.0",
	"description": "",
	"main": "./src/index.js",
	"author": "hjj",
	"license": "ISC",
	"type": "module",
	"scripts": {
		"dev": "node ./src/index.js"
	},
	"dependencies": {
		"config": "^3.3.12",
		"pg": "^8.12.0"
	}
}