Connect to a database then delete all data

func deleteData(conn string) {
  defer db.Close()
  db, err := sql.Open("mysql", conn)
  if err != nil {
    log.Fatalf("Error connecting to database: %v", err)
  }
  // ...
  _, err = db.Exec("DELETE FROM user")
  if err != nil {
    log.Fatalf("Error deleting data: %v", err)
  }
}