golang mysql count(*) 的写法

package main

import (
"database/sql"
"fmt"
"log"

_ "github.com/lib/pq"
)

func main() {
var count int

db, err := sql.Open("postgres", "user=test password=test dbname=foo sslmode=disable")
if err != nil {
log.Fatal(err)
}
defer db.Close()

row := db.QueryRow("SELECT COUNT(*) FROM table_name")
err := row.Scan(&count)
if err != nil {
log.Fatal(err)
}

fmt.Println(count)
}