type A struct {
    point GeoPoint
}

type GeoPoint struct {
    Lat float64
    Lon float64
}

我不熟悉Gorm,但是使用sqlx,您需要实现sql.Scanner和sql.Valuer接口,以允许将数据转换为postgres点类型.下面的代码不会检查错误,因此需要进行一些调整.

https://play.golang.org/p/2-Y-wSeAWnj

package main

import (
    "database/sql/driver"
    "fmt"
    "strconv"
    "strings"
)

type GeoPoint struct {
    Lat float64
    Lon float64
}

func (gp GeoPoint) Value() (driver.Value,error) {
    return fmt.Sprintf("(%d,%d)",gp.Lat,gp.Lon),nil
}

func (gp GeoPoint) Scan(src interface{}) error {
    raw := src.(string)
    coords := raw[1 : len(raw)-1]
    vals := strings.Split(coords,",")
    gp.Lat,_ = strconv.ParseFloat(vals[0],64)
    gp.Lon,_ = strconv.ParseFloat(vals[1],64)
    return nil
}

func main() {
    gp := GeoPoint{Lat: 112,Lon: 53}
    d,_ := gp.Value()
    fmt.Printf("%+v\n",d)

    gp.Scan("(53,-110)")
    fmt.Printf("%+v\n",gp)
}