func Open(driverName, dataSourceName string) (*DB, error) {
    driversMu.RLock()
    driveri, ok := drivers[driverName]
    driversMu.RUnlock()
    if !ok {
        return nil, fmt.Errorf("sql: unknown driver %q (forgotten import?)", driverName)
    }
    db := &DB{
        driver:   driveri,
        dsn:      dataSourceName,
        openerCh: make(chan struct{}, connectionRequestQueueSize),
        lastPut:  make(map[*driverConn]string),
    }
    go db.connectionOpener()
    return db, nil
}

func connection() (*sql.DB, error) {
    return sql.Open("mysql", getDsn())
}

db, err := connection()
if err != nil {
    panic(err.Error())
}

func connection() (*sql.DB, error) {
    //return sql.Open("mysql", getDsn())
    db, _ := sql.Open("mysql", getDsn())
    return db, db.Ping()
}