migrate

type Sqlx struct {
	Migrations []SqlxMigration
	// Printf is used to print out additional information during a migration, such
	// as which step the migration is currently on. It can be replaced with any
	// custom printf function, including one that just ignores inputs. If nil it
	// will default to fmt.Printf.
	Printf func(format string, a ...interface{}) (n int, err error)
}

type SqlxMigration struct {
	ID       string
	Migrate  func(tx *sqlx.Tx) error
	Rollback func(tx *sqlx.Tx) error
}