columns

// open database
db, err := sql.Open("sqlite3", "sql_test.db")
if err != nil {
	fmt.Println(err)
	return
}
defer db.Close()
// query
rows, err := db.Query("SELECT * FROM quotes LIMIT 1")
if err != nil {
	fmt.Println(err)
	return
}
defer rows.Close()
// promote sql.Rows in columns.RowsWithColumns
rh, err := New(rows)
if err != nil {
	fmt.Println(err)
	return
}
// 1st row
if rh.Next() {
	fmt.Println(rh.Length())
}

Output:
4