Why is my golang app returning no Postgres records if compiled without error and returns no errors?

Question

The situation looks like on this picture: https://pasteboard.co/HSsFIgn.png

I have PostgreSQL portable 10.1 and golang 1.10.2 portable. I wrote simple program to fetch data from database and I got no response The code is this: I have no compilation errors, I can run dbapp.exe and I get nothing as a result, please see upper pasted pic or code lower: Thanks for any hints.

package main

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

const (
    DB_USER     = "postgres"
    DB_PASSWORD = ""
    DB_NAME     = "golang"
)

func main() {
    dbinfo := fmt.Sprintf("user=%s password=%s dbname=%s sslmode=disable",
        DB_USER, DB_PASSWORD, DB_NAME)
    db, err := sql.Open("postgres", dbinfo)
    checkErr(err)
    defer db.Close()
    var (
        id int
        name string
    )
    rows, err := db.Query("select id, song from music where id = 1")
    if err != nil {
        log.Fatal(err)
    }
    defer rows.Close()
    for rows.Next() {
        err := rows.Scan(&id, &name)
        if err != nil {
            log.Fatal(err)
        }
        log.Println(id, name)
    }
    err = rows.Err()
    if err != nil {
        log.Fatal(err)
    }
}

func checkErr(err error) {
    if err != nil {
        fmt.Println(err)
        panic(err)
    }
}

Answer 1

Solution is sql.Open string, it was broken or something, now it works this way:

package main
    import (
        "database/sql"
        "fmt"
        _ "github.com/lib/pq"
        "log"
        )
    func main() {
        //necessary to change sql.Open strings
        db, err := sql.Open("postgres", "user=postgres dbname=golang port=5432 sslmode=disable")
        checkErr(err)
        defer db.Close()
        var (
            id int
            name string
        )
        rows, err := db.Query("select id, song from music where id = 1")
        if err != nil {
            log.Fatal(err)
        }
        defer rows.Close()
        for rows.Next() {
            err := rows.Scan(&id, &name)
            if err != nil {
                log.Fatal(err)
            }
            log.Println(id, name)
        }
        err = rows.Err()
        if err != nil {
            log.Fatal(err)
        }
    }
    func checkErr(err error) {
        if err != nil {
            fmt.Println(err)
            panic(err)
        }
    }