Error run code "BUILDING AN APPLICATION WITH GO AND SQLITE"

Getting Help
1

Hello everybody,
I don’t have much programming experience but now I’m trying to learn a programming language well, in the end I chose GO. After reading a few books and doing some little tests with the code, I followed a more complete tutorial to try to make a first complete program. Unfortunately I got stuck almost immediately because by running the first part of the program I get errors and by myself I could not solve them, I ask you for help (sorry for the bad English). This is the first part of the code:

main.go

                                                                 
package main

import (
        "log"
        "github.com/dixonwille/wmenu/v5"
)

func main() {

        menu := wmenu.NewMenu("What would you like to do?")

        menu.Action(func(opts []wmenu.Opt) error { handleFunc(opts); return nil })

        menu.Option("Add a new Person", 0, true, nil)
        menu.Option("Find a Person", 1, false, nil)
        menu.Option("Update a Person's information", 2, false, nil)
        menu.Option("Delete a person by ID", 3, false, nil)
        menuerr := menu.Run()

        if menuerr != nil {
                log.Fatal(menuerr)
        }
}

the error:

go run main.go
main.go:5:2: cannot find package "github.com/dixonwille/wmenu/v5" in any of:
	/home/linuxbrew/.linuxbrew/Cellar/go/1.19.2/libexec/src/github.com/dixonwille/wmenu/v5 (from $GOROOT)
	/home/max/go/src/github.com/dixonwille/wmenu/v5 (from $GOPATH)

Where am I wrong? The package has been installed.
Can you help me?

2

Hi @canuto,

What’s in your go.mod file?

Does a go mod tidy help`

3

Hi Christophberger,
this is the go.mod of the complete project.

module jeremymorgan.com/gosqlite

go 1.17

require (
	github.com/daviddengcn/go-colortext v0.0.0-20180409174941-186a3d44e920 // indirect
	github.com/dixonwille/wlog/v3 v3.0.1 // indirect
	github.com/dixonwille/wmenu/v5 v5.1.0 // indirect
	github.com/mattn/go-isatty v0.0.11 // indirect
	github.com/mattn/go-sqlite3 v1.14.8 // indirect
	golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 // indirect
)

The tutorial with the project I’m following can be found here:
allhandsontech.com/programming/golang/how-to-use-sqlite-with-go

Thanks for answering me.

4

Thanks for sharing the go.mod file. It looks fine except that I would expect wmenu to be a direct dependency.

To test this, I took the first two code snippets from the SQLite tutorial you mentioned (these are just enough so that the code compiles and runs), put them into a main.go file and created a go.mod file with go mod init.

Then I ran go mod tidy:

> go mod tidy                                            0s
go: downloading github.com/dixonwille/wmenu/v5 v5.1.0
go: downloading github.com/dixonwille/wlog/v3 v3.0.1
go: downloading github.com/mattn/go-isatty v0.0.11
go: downloading github.com/daviddengcn/go-colortext v0.0.0-20180409174941-186a3d44e920
go: downloading golang.org/x/sys v0.0.0-20191026070338-33540a1f6037
go: downloading github.com/stretchr/testify v1.4.0
go: downloading github.com/golangplus/testing v0.0.0-20180327235837-af21d9c3145e
go: downloading github.com/pmezard/go-difflib v1.0.0
go: downloading gopkg.in/yaml.v2 v2.2.2
go: downloading github.com/davecgh/go-spew v1.1.0

go run main.go works fine:

> go run main.go                                        0s
1) *Add a new Person
2) Find a Person
3) Update a Person's information
4) Delete a person by ID
What would you like to do?
1
Adding a new Person

Questions:

  1. What is your output of go mod tidy?
  2. Does go clean -modcache && go mod tidy improve anything?
  3. If this does not help, what does go build return?
5

Thanks for the reply. Unfortunately I continue to have errors. You have to excuse me but this is my first time and so who knows how many mistakes I make. So I tried to do what you tried and more exactly:

I created main.go with this code:

package main

import (
        "log"
        "github.com/dixonwille/wmenu/v5"
)

func main() {

        menu := wmenu.NewMenu("What would you like to do?")

        menu.Action(func(opts []wmenu.Opt) error { handleFunc(opts); return nil })

        menu.Option("Add a new Person", 0, true, nil)
        menu.Option("Find a Person", 1, false, nil)
        menu.Option("Update a Person's information", 2, false, nil)
        menu.Option("Delete a person by ID", 3, false, nil)
        menuerr := menu.Run()

        if menuerr != nil {
                log.Fatal(menuerr)
        }
}

func handleFunc(opts []wmenu.Opt) {

        switch opts[0].Value {

        case 0:
                fmt.Println("Adding a new Person")
        case 1:
                fmt.Println("Finding a Person")
        case 2:
                fmt.Println("Update a Person's information")
        case 3:
                fmt.Println("Deleting a person by ID")
        case 4:
                fmt.Println("Quitting application")
        }
}

Then I tried to give the command “go mod init” but I get this error:

go: cannot determine module path for source directory /home/max/go/SqliteTest/Test1-Sqlite (outside GOPATH, module path must be specified)

So I created a go.mod file with this content:

module jeremymorgan.com/gosqlite

go 1.17

require github.com/dixonwille/wmenu/v5 v5.1.0

require (
        github.com/daviddengcn/go-colortext v0.0.0-20180409174941-186a3d44e920 // indirect
        github.com/dixonwille/wlog/v3 v3.0.1 // indirect
        github.com/mattn/go-isatty v0.0.11 // indirect
        golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 // indirect
)

Running go mod tidy i get:

go: downloading github.com/stretchr/testify v1.4.0
go: downloading github.com/golangplus/testing v0.0.0-20180327235837-af21d9c3145e
go: downloading github.com/davecgh/go-spew v1.1.0
go: downloading github.com/pmezard/go-difflib v1.0.0
go: downloading gopkg.in/yaml.v2 v2.2.2

go run main.go:

./main.go:30:3: undefined: fmt
./main.go:32:3: undefined: fmt
./main.go:34:3: undefined: fmt
./main.go:36:3: undefined: fmt
./main.go:38:3: undefined: fmt

Go build returns

# jeremymorgan.com/gosqlite
./main.go:30:3: undefined: fmt
./main.go:32:3: undefined: fmt
./main.go:34:3: undefined: fmt
./main.go:36:3: undefined: fmt
./main.go:38:3: undefined: fmt
6

You need to import “fmt”.

1 Like
7

This error occurs because go mod init needs the module path as an argument.

If you rename your current go.mod file and call

go mod init jeremymorgan.com/gosqlite

you should then get a go.mod file like the one you created manually.

As @mje already wrote, you need to import the fmt package, which is part of the standard library.

Tip: a Go-aware editor can automatically add or remove imports from the standard library as required, using the Go language server. (And also 3rd-party packages as long as the editor can resolve the package path.) So when you type, for example, fmt.Println, the editor inserts import "fmt" automatically.

8

OK thanks.

9

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