返回的参数过多 [英] Too many arguments to return

问题描述

我有这个golang文件:

I have this golang file:

package main

import (
    "log"
    "sync"

    "github.com/jmoiron/sqlx"
)

var db *sqlx.DB
var once sync.Once

// GetDBConnection whatever
func GetDBConnection() {

    once.Do(func() {
        db, err := sqlx.Connect("postgres", "user=tom dbname=jerry password=myPassword sslmode=disable")
        if err != nil {
            log.Fatalln(err)
        }
    })

    return db   // <<< error here

}

我收到此错误:

要返回的参数太多

我只是试图创建一个单例模式并返回db连接.我不确定sqlx.Connect返回的类型是否为sqlx.DB，这可能是问题所在.有没有一种快速的方法来确定 sqlx.Connect()的返回类型?

I am just trying to create a singleton pattern and return the db connection. I am not sure if what is returned from sqlx.Connect is type sqlx.DB, that might be the problem. Is there a quick way to determine the return type of sqlx.Connect()?

推荐答案

您已声明函数 GetDBConnection()不返回任何参数.

You've declared the function GetDBConnection() to return no arguments.

func GetDBConnection() {

您必须告诉Go 您打算返回的参数类型:

You have to tell Go the type of the argument you intend to return:

func GetDBConnection() *sqlx.DB {

关于确定类型，我只是去看一下源代码.您也可以查看godoc.org上的文档，该文档是自动从公开可用的Go软件包生成.

As for determining the type, I just went to look at the source code. You could also look at the documentation on godoc.org, which is auto-generated from publicly available Go packages.

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