golang结构体tag的使用小结

type StructName struct {
    FieldName FieldType `tagKey:"tagValue"`
}

FieldName string `json:"name" xml:"name" validate:"required"`

type User struct {
    ID    int    `json:"id"`
    Name  string `json:"name"`
    Email string `json:"email,omitempty"`
    Age   int    `json:"-"`             // 不序列化
}

package main
​
import (
    "encoding/json"
    "fmt"
)
​
type User struct {
    ID    int    `json:"id"`
    Name  string `json:"name"`
    Email string `json:"email,omitempty"`
    Age   int    `json:"-"`
}
​
func main() {
    user := User{ID: 1001, Name: "李雷", Email: "", Age: 30}
    result, _ := json.Marshal(user)
    fmt.Println(string(result)) // 输出：{"id":1001,"name":"李雷"}
}

type Product struct {
    ID    int    `gorm:"primaryKey;autoIncrement" json:"id"`
    Name  string `gorm:"type:varchar(100);not null" json:"name"`
    Price int    `gorm:"column:product_price" json:"price"`
}

type LoginForm struct {
    Username string `form:"username" json:"username" binding:"required"`
    Password string `form:"password" json:"password" binding:"required,min=6"`
}

import (
    "fmt"
    "reflect"
)
​
type Person struct {
    Name string `json:"name" label:"姓名"`
}
​
func main() {
    t := reflect.TypeOf(Person{})
    field := t.Field(0)
​
    fmt.Println("json tag:", field.Tag.Get("json"))  // 输出 name
    fmt.Println("label tag:", field.Tag.Get("label"))// 输出 姓名
}

+-------------------+
| struct 定义       |
|-------------------|
| Name string       |
|      `json:"name"`| ----->  序列化 JSON 输出字段 "name"
+-------------------+