gorm定义模型时字段指针和非指针区别

Question

使用gorm定义如下模型：

type User struct {
  ID           uint
  Name         string
  Email        *string
  Age          uint8
  Birthday     *time.Time
  MemberNumber sql.NullString
  ActivatedAt  sql.NullTime
  CreatedAt    time.Time
  UpdatedAt    time.Time
}

问：此处Email是string 和 *string 的区别和用法场景，能否用一个简单例子示意，谢谢！

Answer 1

REF: StackOverflow - Difference in string and *string in Gorm model declaration