1. Install the github.com/go-sql-driver/mysql package, using the go get command, as follows:

$ go get github.com/go-sql-driver/mysql

2. Create connect-mysql.go. Then we connect to the MySQL database and perform a SELECT query to get the current database name, as follows:

package main
import 
(
  "database/sql"
  "fmt"
  "log"
  "net/http"
  "github.com/go-sql-driver/mysql"
)
const 
(
  CONN_HOST = "localhost"
  CONN_PORT = "8080"
  DRIVER_NAME = "mysql"
  DATA_SOURCE_NAME = "root:password@/mydb"
)
var db *sql.DB
var connectionError error
func init() 
{
  db, connectionError = sql.Open(DRIVER_NAME, DATA_SOURCE_NAME)
  if connectionError != nil 
  {
    log.Fatal("error connecting to database :: ", connectionError)
  }
}
func getCurrentDb(w http.ResponseWriter, r *http.Request) 
{
  rows, err := db.Query("SELECT DATABASE() as db")
  if err != nil 
  {
    log.Print("error executing query :: ", err)
    return
  }
  var db string
  for rows.Next() 
  {
    rows.Scan(&db)
  }
  fmt.Fprintf(w, "Current Database is :: %s", db)
}
func main() 
{
  http.HandleFunc("/", getCurrentDb)
  defer db.Close()
  err := http.ListenAndServe(CONN_HOST+":"+CONN_PORT, nil)
  if err != nil 
  {
    log.Fatal("error starting http server :: ", err)
    return
  }
}

3. Run the program with the following command: 

$ go run connect-mysql.go