GoFrame框架Scan类型转换实例
前言
Scan转换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。
方法定义
// 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)
自动识别转换Struct结构体
示例代码
package main
import (
"GitHub.com/Gogf/gf/frame/g"
"github.com/gogf/gf/util/GConv"
)
func main() {
type User struct {
Uid int
Name string
}
params := g.Map{
"uid": 1,
"name": "王中阳",
}
var user *User
if err := gconv.Scan(params, &user); err != nil {
panic(err)
}
g.Dump(user)
}
运行结果
自动识别转换Struct数组
示例代码
package main
import (
"github.com/gogf/gf/frame/g"
"github.com/gogf/gf/util/gconv"
)
func main() {
type User struct {
Uid int
Name string
}
params := g.Slice{
g.Map{
"uid": 1,
"name": "优弧",
},
g.Map{
"uid": 2,
"name": "船长",
},
}
var users []*User
if err := gconv.Scan(params, &users); err != nil {
panic(err)
}
g.Dump(users)
}
运行结果
自动识别转换Map
示例代码
package main
import (
"github.com/gogf/gf/frame/g"
"github.com/gogf/gf/util/gconv"
)
func main() {
var (
user map[string]string
params = g.Map{
"uid": 1,
"name": "王中阳",
}
)
if err := gconv.Scan(params, &user); err != nil {
panic(err)
}
g.Dump(user)
}
运行结果
自动识别转换Map数组
示例代码
package main
import (
"github.com/gogf/gf/frame/g"
"github.com/gogf/gf/util/gconv"
)
func main() {
var (
users []map[string]string
params = g.Slice{
g.Map{
"uid": 1,
"name": "优弧",
},
g.Map{
"uid": 2,
"name": "船长",
},
}
)
if err := gconv.Scan(params, &users); err != nil {
panic(err)
}
g.Dump(users)
}
运行结果
总结
我们使用Go语言的开发过程中,JSON数据和结构体的转换是经常遇到的。
GoFrame为我们封装了Scan转换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。
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