model

type Customer struct {
	gorm.Model

	Name    string  `gorm:"type:varchar(100);not null"`
	Age     int     `gorm:"type:int"`
	Phone   string  `gorm:"type:varchar(11)"`
	Address string  `gorm:"type:text"`
	Amount  float64 `gorm:"type:float"`
}

type Mytable struct {
	ID       int32   `gorm:"column:ID;type:int(11);not null" json:"ID_example"`
	Username *string `gorm:"column:username;type:varchar(16);index:idx_username,priority:1;default:NULL" json:"username_example"`
	Age      int32   `gorm:"column:age;type:int(8);not null" json:"age_example"`
	Phone    string  `gorm:"column:phone;type:varchar(11);not null" json:"phone_example"`
}