source

type Direction string

type Driver interface {
	// Open returns a new driver instance configured with parameters
	// coming from the URL string. Migrate will call this function
	// only once per instance.
	Open(url string) (Driver, error)

	// Close closes the underlying source instance managed by the driver.
	// Migrate will call this function only once per instance.
	Close() error

	// First returns the very first migration version available to the driver.
	// Migrate will call this function multiple times.
	// If there is no version available, it must return os.ErrNotExist.
	First() (version uint, err error)

	// Prev returns the previous version for a given version available to the driver.
	// Migrate will call this function multiple times.
	// If there is no previous version available, it must return os.ErrNotExist.
	Prev(version uint) (prevVersion uint, err error)

	// Next returns the next version for a given version available to the driver.
	// Migrate will call this function multiple times.
	// If there is no next version available, it must return os.ErrNotExist.
	Next(version uint) (nextVersion uint, err error)

	// ReadUp returns the UP migration body and an identifier that helps
	// finding this migration in the source for a given version.
	// If there is no up migration available for this version,
	// it must return os.ErrNotExist.
	// Do not start reading, just return the ReadCloser!
	ReadUp(version uint) (r io.ReadCloser, identifier string, err error)

	// ReadDown returns the DOWN migration body and an identifier that helps
	// finding this migration in the source for a given version.
	// If there is no down migration available for this version,
	// it must return os.ErrNotExist.
	// Do not start reading, just return the ReadCloser!
	ReadDown(version uint) (r io.ReadCloser, identifier string, err error)
}

type ErrDuplicateMigration struct {
	Migration
	os.FileInfo
}

type Migration struct {
	// Version is the version of this migration.
	Version uint

	// Identifier can be any string that helps identifying
	// this migration in the source.
	Identifier string

	// Direction is either Up or Down.
	Direction Direction

	// Raw holds the raw location path to this migration in source.
	// ReadUp and ReadDown will use this.
	Raw string
}

type Migrations struct {
	// contains filtered or unexported fields
}