如果我有这样的类型,如何使用GORM存储嵌入式结构
type A struct {
point GeoPoint
}
type GeoPoint struct {
Lat float64
Lon float64
}
如何才能做到这一点？
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)
}
