GoFrame must-know and must-know Scan: type conversion

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ScanThe conversion method can realize the struct/struct数组/map/map数组conversion of any parameter to, and automatically recognize and execute the conversion according to the conversion target parameters input by the developer.

method definition

// 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)
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Automatically recognize conversion Structstructures

sample code

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)
}
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operation result

Automatically recognize transformation Structarrays

sample code

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)
}
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operation result

Automatically identify and convert Map

sample code

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)
}
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operation result

Automatically recognize transformation Maparrays

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)
}
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operation result

Summarize

In the development process of our Go language, the conversion of json data and structure is often encountered.

GoFrame encapsulates the Scanconversion method for us to realize the conversion of any parameter to struct/struct数组/map/map数组, and automatically recognizes and executes the conversion according to the conversion target parameters input by the developer.

At last

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