恐慌：拨号tcp：查找tcp/5432，：getaddrinfow：找不到指定的类

Question

任何人都可以帮我解决这个错误吗？

panic: dial tcp: lookup tcp/5432,: getaddrinfow: The specified class was not found.

goroutine 1 [running]:
main.main()
        C:/Dev/Digitalent/scalable-web-service-with-golang/go-sql/main.go:35 +0x23a
exit status 2

这是代码。

package main

import (
"database/sql"
"fmt"

_ "github.com/lib/pq"

）

const (
host     = "localhost"
port     = 5432
username = "postgres"
password = "*********"
dbName   = "db-go-sql"

）

var (
db  *sql.DB
err error

）

func main() {
psqlURL := fmt.Sprintf("host=%s port=%d, user=%s, password=%s "+
    "dbname=%s sslmode=disable", host, port, username, password, dbName)

db, err = sql.Open("postgres", psqlURL)
if err != nil {
    panic(err)
}
defer db.Close()

err = db.Ping()
if err != nil {
    panic(err)
}

fmt.Println("Connection to postgresql established")

}

这是关于将我的 Go Lang 代码与 PostgreSQL 连接起来。我一遍又一遍地检查连接，例如主机、端口、用户名、密码和数据库名，我认为一切都很好。但是，当我运行主程序时，总是出现这个错误。我正在使用 Windows 11。谢谢！

Answer 1

psqlURL := fmt.Sprintf("host=%s port=%d, user=%s, password=%s "+
        "dbname=%s sslmode=disable", host, port, username, password, dbName)

您确实有一个带有 url 字符串的

,

。删除它并尝试。

psqlURL := fmt.Sprintf("host=%s port=%d user=%s password=%s "+
        "dbname=%s sslmode=disable", host, port, username, password, dbName)