不能导入gorillamux ([email protected]：在go.mod中明确要求，但在vendormodules.txt中没有标记为明确)

Question

在Go中，我正在尝试简单的数据库连接。我需要导入 gorilla/mux但我不能。

我使用的是VS Code。在 cd 的项目目录，我创建了 main.go 并确实运行 go get -u github.com/gorilla/mux

这里是 main.go

package main

import (
    "database/sql"
    "fmt"
    "github.com/gorilla/mux"
    _ "github.com/lib/pq"
)

const (
    host     = "localhost"
    port     = 3000
    user     = "postgres"
    password = "postgres"
    dbname   = "test1"
)

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

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

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

    fmt.Println("Successfully connected!")
}

[注意，在执行了 go get -u github.com/gorilla/mux 终端显示

C:\Go\src\github.com\IamFrost\go-rest-api>go get -v -u github.com/gorilla/mux
go: golang.org/x/text upgrade => v0.3.2
go: golang.org/x/crypto upgrade => v0.0.0-20200429183012-4b2356b1ed79
go: golang.org/x/sys upgrade => v0.0.0-20200430082407-1f5687305801
go: golang.org/x/net upgrade => v0.0.0-20200425230154-ff2c4b7c35a0
go: downloading golang.org/x/sys v0.0.0-20200430082407-1f5687305801
golang.org/x/sys/cpu
golang.org/x/crypto/chacha20poly1305
crypto/tls

]

看，我在小地图中没有其他语法错误。在红色标记处，当我把鼠标放在悬停文字上时，我觉得很有趣。

1)imported but not used

但下一行

2)no package for import github.com/gorilla/mux)

lol这不是违背了1）吗？

谁来解释一下为什么会出现这种情况

然而，

使用后 go build 在 终端

这里是终端。

C:\Go\src\github.com\IamFrost\go-rest-api>go build
go: inconsistent vendoring in C:\Go\src:
        github.com/gorilla/[email protected]: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt
        github.com/lib/[email protected]: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt
        golang.org/x/[email protected]: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt
        golang.org/x/[email protected]: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt
        golang.org/x/[email protected]: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt
        golang.org/x/[email protected]: is marked as explicit in vendor/modules.txt, but not explicitly required in go.mod
        golang.org/x/[email protected]: is marked as explicit in vendor/modules.txt, but not explicitly required in go.mod
        golang.org/x/[email protected]: is marked as explicit in vendor/modules.txt, but not explicitly required in go.mod

run 'go mod vendor' to sync, or use -mod=mod or -mod=readonly to ignore the vendor directory

[注：我也做了 "去mod vendor"，但没有变化]

所以谁能告诉我为什么我不能导入 gorilla/mux 或 pq.

我还需要做什么？

(请解释一下什么意思？is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt)

Answer 1

我不知道为什么它能工作（我是初学者）。我在net中找到了一些东西，不知怎么就成功了。下面是怎么做的。

1)这是我的go目录 C:\Go\ . 但我在我的桌面文件夹中创建项目

2)然后我在C:\Go\src下重新创建了一个项目(这是确切的文件夹C:\Go\src\github.com [github_username]\ [project_name] )

3)然后我把所有的代码粘贴到了 main.go

4)最后从终端 go mod vendor

5)然后 go build

6）然后 go run main.go

7）终于成功了

[我想知道为什么它的工作。我真的很感谢你的评论： 为什么他们强迫我去下。C:\Go\src. 我已经有了 GOPATH C:\Go\ , GOBIN C:\Go\bin 设置在环境变量中]