前面关于复杂类型的转换功能如果大家觉得还不够的话,那么您可以了解下Scan
转换方法,该方法可以实现对任意参数到struct/struct数组/map/map数组
的转换,并且根据开发者输入的转换目标参数自动识别执行转换。
该方法定义如下:
// Scan automatically calls MapToMap, MapToMaps, Struct or Structs function according to
// the type of parameter `pointer` to implement the converting.
// It calls function MapToMap if `pointer` is type of *map to do the converting.
// It calls function MapToMaps if `pointer` is type of *[]map/*[]*map to do the converting.
// It calls function Struct if `pointer` is type of *struct/**struct to do the converting.
// It calls function Structs if `pointer` is type of *[]struct/*[]*struct to do the converting.
func Scan(params interface{}, pointer interface{}, mapping ...map[string]string) (err error)
我们接下来看几个示例便可快速理解。
自动识别转换Struct
package main
import (
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/util/gconv"
)
func main() {
type User struct {
Uid int
Name string
}
params := g.Map{
"uid": 1,
"name": "john",
}
var user *User
if err := gconv.Scan(params, &user); err != nil {
panic(err)
}
g.Dump(user)
}
执行后,输出结果为:
{
"Name": "john",
"Uid": 1
}
自动识别转换Struct
数组
package main
import (
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/util/gconv"
)
func main() {
type User struct {
Uid int
Name string
}
params := g.Slice{
g.Map{
"uid": 1,
"name": "john",
},
g.Map{
"uid": 2,
"name": "smith",
},
}
var users []*User
if err := gconv.Scan(params, &users); err != nil {
panic(err)
}
g.Dump(users)
}
执行后,终端输出:
[
{
"Uid": 1,
"Name": "john"
},
{
"Uid": 2,
"Name": "smith"
}
]
自动识别转换Map
package main
import (
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/util/gconv"
)
func main() {
var (
user map[string]string
params = g.Map{
"uid": 1,
"name": "john",
}
)
if err := gconv.Scan(params, &user); err != nil {
panic(err)
}
g.Dump(user)
}
执行后,输出结果为:
{
"uid": "1",
"name": "john"
}
自动识别转换Map
数组
package main
import (
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/util/gconv"
)
func main() {
var (
users []map[string]string
params = g.Slice{
g.Map{
"uid": 1,
"name": "john",
},
g.Map{
"uid": 2,
"name": "smith",
},
}
)
if err := gconv.Scan(params, &users); err != nil {
panic(err)
}
g.Dump(users)
}
执行后,输出结果为:
[
{
"name": "john",
"uid": "1"
},
{
"name": "smith",
"uid": "2"
}
]