/*
CREATE TABLE `user` (
	`Fid` INT(10) UNSIGNED NOT NULL DEFAULT '0',
	`Fname` VARCHAR(64) NOT NULL DEFAULT '',
	`Fver` INT(10) UNSIGNED NOT NULL DEFAULT '0',
	PRIMARY KEY (`Fid`)
)
*/
type User struct {
	Id   uint64 `xorm:"PK"`
	Name string `xorm:""`
	Ver  uint64 `xorm:"version"`
}

mapper := core.NewPrefixMapper(core.SnakeMapper{}, "F")
engine.SetColumnMapper(mapper)

update := map[string]interface{}{
	"Fname": "user name",
	"Fver":  1,
}
rows, err := engine.Table(new(User)).ID(1).Update(update)
// panic: reflect: call of reflect.Value.Interface on zero Value

update := map[string]interface{}{
	"Name": "user name",
	"Ver":  1,
}
rows, err := engine.Table(new(User)).ID(1).Update(update)
// err, column `Ver` not exists