如何在 Go 中有效率地將資料庫行轉換為 Map 切片？

package main

import (
    "database/sql"
    "fmt"

    _ "github.com/go-sql-driver/mysql"
    "github.com/jmoiron/sqlx"
)

type Place struct {
    ID      int
    Telcode int
}

func main() {
    db, err := sqlx.Open("mysql", "user:password@tcp(localhost:3306)/database")
    if err != nil {
        fmt.Printf(err)
        return
    }

    rows, err := db.Query("SELECT * FROM place ORDER BY telcode ASC")
    if err != nil {
        fmt.Printf(err)
        return
    }

    places := []map[string]interface{}{}
    for rows.Next() {
        rowMap := make(map[string]interface{})

        if err := rows.MapScan(rowMap); err != nil {
            fmt.Printf(err)
            return
        }

        places = append(places, rowMap)
    }

    fmt.Println(places)
}