Gorm datatypes.JSON Example Code

gorm-json-example.go

package main

import (
	"encoding/json"
	"fmt"

	"gorm.io/datatypes"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

type User struct {
	gorm.Model
	Name string
	Data datatypes.JSON
}

type UserData struct {
	Age  int    `json:"age"`
	Mail string `json:"mail"`
}

func main() {
	// init sqlite database
	db, err := gorm.Open(sqlite.Open("./data.db"), &gorm.Config{})
	if err != nil {
		panic(err)
	}
	db.AutoMigrate(&User{})
	// create
	user1 := User{
		Name: "Aimer",
		Data: datatypes.JSON(`{"age": 18, "mail": "aimer@example.com"}`),
	}
	user2 := User{
		Name: "Neige",
		Data: datatypes.JSON(`{"age": 19, "mail": "neige@example.com"}`),
	}
	db.Create(&user1)
	db.Create(&user2)
	// search
	var user User
	db.Where("data->>'age' = ?", 18).First(&user)
	fmt.Printf("%v\n", &user)
	// convert datatypes.JSON to JSON:
	jsonBytes, _ := user.Data.MarshalJSON()
	jsonData := string(jsonBytes)
	fmt.Println(jsonData)
	// unmarshal
	var userData UserData
	json.Unmarshal(jsonBytes, &userData)
	fmt.Printf("Age: %d, Mail: %s\n", userData.Age, userData.Mail)
}