hawk

type Dialect interface {
	// CreateMigrationsTable sets up the database for use by Hawk.
	//
	// Dialects are free to determine how the migration state is
	// represented in the database, so long as the Dialect interface
	// can be satisfied.
	CreateMigrationsTable(db *sql.DB) error

	// GetVersion gets the number of the currently applied migration
	// from the database.
	//
	// If there are no currently applied migrations, this should return
	// -1 as the migration number and a nil error.
	GetVersion(db *sql.DB) (int64, error)

	// SetVersion sets the number of the currently applied migration in
	// the database.
	SetVersion(tx *sql.Tx, version int64) error
}

type Engine struct {
	DB      *sql.DB
	Dialect Dialect
	// contains filtered or unexported fields
}

type Migration interface {
	// Up applies to the database.
	Up(tx *sql.Tx) error

	// Down un-applies to the database.
	Down(tx *sql.Tx) error
}

type MigrationReference struct {
	Num  int64
	Name string
}

type Result struct {
	Version MigrationReference
	Skipped []MigrationReference
	Applied []MigrationReference
}